diff --git a/swh/indexer/metadata_dictionary/base.py b/swh/indexer/metadata_dictionary/base.py
index 0ddd975..0a2becf 100644
--- a/swh/indexer/metadata_dictionary/base.py
+++ b/swh/indexer/metadata_dictionary/base.py
@@ -1,177 +1,177 @@
 # Copyright (C) 2017-2019  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import json
 import logging
 from typing import List
 
 from swh.indexer.codemeta import SCHEMA_URI, compact, merge_values
 
 
 class BaseMapping:
     """Base class for mappings to inherit from
 
     To implement a new mapping:
 
     - inherit this class
     - override translate function
     """
 
     def __init__(self, log_suffix=""):
         self.log_suffix = log_suffix
         self.log = logging.getLogger(
             "%s.%s" % (self.__class__.__module__, self.__class__.__name__)
         )
 
     @property
     def name(self):
         """A name of this mapping, used as an identifier in the
         indexer storage."""
         raise NotImplementedError(f"{self.__class__.__name__}.name")
 
     @classmethod
     def detect_metadata_files(cls, files):
         """
         Detects files potentially containing metadata
 
         Args:
             file_entries (list): list of files
 
         Returns:
             list: list of sha1 (possibly empty)
         """
         raise NotImplementedError(f"{cls.__name__}.detect_metadata_files")
 
     def translate(self, file_content):
         raise NotImplementedError(f"{self.__class__.__name__}.translate")
 
     def normalize_translation(self, metadata):
         return compact(metadata)
 
 
 class SingleFileMapping(BaseMapping):
     """Base class for all mappings that use a single file as input."""
 
     @property
     def filename(self):
         """The .json file to extract metadata from."""
         raise NotImplementedError(f"{self.__class__.__name__}.filename")
 
     @classmethod
     def detect_metadata_files(cls, file_entries):
         for entry in file_entries:
-            if entry["name"] == cls.filename:
+            if entry["name"].lower() == cls.filename.lower():
                 return [entry["sha1"]]
         return []
 
 
 class DictMapping(BaseMapping):
     """Base class for mappings that take as input a file that is mostly
     a key-value store (eg. a shallow JSON dict)."""
 
     string_fields = []  # type: List[str]
     """List of fields that are simple strings, and don't need any
     normalization."""
 
     @property
     def mapping(self):
         """A translation dict to map dict keys into a canonical name."""
         raise NotImplementedError(f"{self.__class__.__name__}.mapping")
 
     @staticmethod
     def _normalize_method_name(name):
         return name.replace("-", "_")
 
     @classmethod
     def supported_terms(cls):
         return {
             term
             for (key, term) in cls.mapping.items()
             if key in cls.string_fields
             or hasattr(cls, "translate_" + cls._normalize_method_name(key))
             or hasattr(cls, "normalize_" + cls._normalize_method_name(key))
         }
 
     def _translate_dict(self, content_dict, *, normalize=True):
         """
         Translates content  by parsing content from a dict object
         and translating with the appropriate mapping
 
         Args:
             content_dict (dict): content dict to translate
 
         Returns:
             dict: translated metadata in json-friendly form needed for
             the indexer
 
         """
         translated_metadata = {"@type": SCHEMA_URI + "SoftwareSourceCode"}
         for k, v in content_dict.items():
             # First, check if there is a specific translation
             # method for this key
             translation_method = getattr(
                 self, "translate_" + self._normalize_method_name(k), None
             )
             if translation_method:
                 translation_method(translated_metadata, v)
             elif k in self.mapping:
                 # if there is no method, but the key is known from the
                 # crosswalk table
                 codemeta_key = self.mapping[k]
 
                 # if there is a normalization method, use it on the value
                 normalization_method = getattr(
                     self, "normalize_" + self._normalize_method_name(k), None
                 )
                 if normalization_method:
                     v = normalization_method(v)
                 elif k in self.string_fields and isinstance(v, str):
                     pass
                 elif k in self.string_fields and isinstance(v, list):
                     v = [x for x in v if isinstance(x, str)]
                 else:
                     continue
 
                 # set the translation metadata with the normalized value
                 if codemeta_key in translated_metadata:
                     translated_metadata[codemeta_key] = merge_values(
                         translated_metadata[codemeta_key], v
                     )
                 else:
                     translated_metadata[codemeta_key] = v
         if normalize:
             return self.normalize_translation(translated_metadata)
         else:
             return translated_metadata
 
 
 class JsonMapping(DictMapping, SingleFileMapping):
     """Base class for all mappings that use a JSON file as input."""
 
     def translate(self, raw_content):
         """
         Translates content by parsing content from a bytestring containing
         json data and translating with the appropriate mapping
 
         Args:
             raw_content (bytes): raw content to translate
 
         Returns:
             dict: translated metadata in json-friendly form needed for
             the indexer
 
         """
         try:
             raw_content = raw_content.decode()
         except UnicodeDecodeError:
             self.log.warning("Error unidecoding from %s", self.log_suffix)
             return
         try:
             content_dict = json.loads(raw_content)
         except json.JSONDecodeError:
             self.log.warning("Error unjsoning from %s", self.log_suffix)
             return
         if isinstance(content_dict, dict):
             return self._translate_dict(content_dict)
diff --git a/swh/indexer/tests/test_metadata.py b/swh/indexer/tests/test_metadata.py
index 0505934..81fdb1a 100644
--- a/swh/indexer/tests/test_metadata.py
+++ b/swh/indexer/tests/test_metadata.py
@@ -1,1205 +1,1238 @@
 # Copyright (C) 2017-2020  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import json
 import unittest
 
 from hypothesis import HealthCheck, given, settings, strategies
 
 from swh.indexer.codemeta import CODEMETA_TERMS
 from swh.indexer.metadata import ContentMetadataIndexer, RevisionMetadataIndexer
 from swh.indexer.metadata_detector import detect_metadata
 from swh.indexer.metadata_dictionary import MAPPINGS
 from swh.indexer.metadata_dictionary.maven import MavenMapping
 from swh.indexer.metadata_dictionary.npm import NpmMapping
 from swh.indexer.metadata_dictionary.ruby import GemspecMapping
 from swh.indexer.storage.model import ContentMetadataRow, RevisionIntrinsicMetadataRow
 from swh.indexer.tests.utils import DIRECTORY2, REVISION
 from swh.model.hashutil import hash_to_bytes
 from swh.model.model import Directory, DirectoryEntry, Revision
 
 from .utils import (
     BASE_TEST_CONFIG,
     YARN_PARSER_METADATA,
     fill_obj_storage,
     fill_storage,
     json_document_strategy,
     xml_document_strategy,
 )
 
 TRANSLATOR_TOOL = {
     "name": "swh-metadata-translator",
     "version": "0.0.2",
     "configuration": {"type": "local", "context": "NpmMapping"},
 }
 
 
 class ContentMetadataTestIndexer(ContentMetadataIndexer):
     """Specific Metadata whose configuration is enough to satisfy the
        indexing tests.
     """
 
     def parse_config_file(self, *args, **kwargs):
         assert False, "should not be called; the rev indexer configures it."
 
 
 REVISION_METADATA_CONFIG = {
     **BASE_TEST_CONFIG,
     "tools": TRANSLATOR_TOOL,
 }
 
 
 class Metadata(unittest.TestCase):
     """
     Tests metadata_mock_tool tool for Metadata detection
     """
 
     def setUp(self):
         """
         shows the entire diff in the results
         """
         self.maxDiff = None
         self.npm_mapping = MAPPINGS["NpmMapping"]()
         self.codemeta_mapping = MAPPINGS["CodemetaMapping"]()
         self.maven_mapping = MAPPINGS["MavenMapping"]()
         self.pkginfo_mapping = MAPPINGS["PythonPkginfoMapping"]()
         self.gemspec_mapping = MAPPINGS["GemspecMapping"]()
 
     def test_compute_metadata_none(self):
         """
         testing content empty content is empty
         should return None
         """
         # given
         content = b""
 
         # None if no metadata was found or an error occurred
         declared_metadata = None
         # when
         result = self.npm_mapping.translate(content)
         # then
         self.assertEqual(declared_metadata, result)
 
     def test_compute_metadata_npm(self):
         """
         testing only computation of metadata with hard_mapping_npm
         """
         # given
         content = b"""
             {
                 "name": "test_metadata",
                 "version": "0.0.2",
                 "description": "Simple package.json test for indexer",
                   "repository": {
                     "type": "git",
                     "url": "https://github.com/moranegg/metadata_test"
                 },
                 "author": {
                     "email": "moranegg@example.com",
                     "name": "Morane G"
                 }
             }
         """
         declared_metadata = {
             "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
             "type": "SoftwareSourceCode",
             "name": "test_metadata",
             "version": "0.0.2",
             "description": "Simple package.json test for indexer",
             "codeRepository": "git+https://github.com/moranegg/metadata_test",
             "author": [
                 {"type": "Person", "name": "Morane G", "email": "moranegg@example.com",}
             ],
         }
 
         # when
         result = self.npm_mapping.translate(content)
         # then
         self.assertEqual(declared_metadata, result)
 
     def test_index_content_metadata_npm(self):
         """
         testing NPM with package.json
         - one sha1 uses a file that can't be translated to metadata and
           should return None in the translated metadata
         """
         # given
         sha1s = [
             hash_to_bytes("26a9f72a7c87cc9205725cfd879f514ff4f3d8d5"),
             hash_to_bytes("d4c647f0fc257591cc9ba1722484229780d1c607"),
             hash_to_bytes("02fb2c89e14f7fab46701478c83779c7beb7b069"),
         ]
         # this metadata indexer computes only metadata for package.json
         # in npm context with a hard mapping
         config = BASE_TEST_CONFIG.copy()
         config["tools"] = [TRANSLATOR_TOOL]
         metadata_indexer = ContentMetadataTestIndexer(config=config)
         fill_obj_storage(metadata_indexer.objstorage)
         fill_storage(metadata_indexer.storage)
 
         # when
         metadata_indexer.run(sha1s)
         results = list(metadata_indexer.idx_storage.content_metadata_get(sha1s))
 
         expected_results = [
             ContentMetadataRow(
                 id=hash_to_bytes("26a9f72a7c87cc9205725cfd879f514ff4f3d8d5"),
                 tool=TRANSLATOR_TOOL,
                 metadata={
                     "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                     "type": "SoftwareSourceCode",
                     "codeRepository": "git+https://github.com/moranegg/metadata_test",
                     "description": "Simple package.json test for indexer",
                     "name": "test_metadata",
                     "version": "0.0.1",
                 },
             ),
             ContentMetadataRow(
                 id=hash_to_bytes("d4c647f0fc257591cc9ba1722484229780d1c607"),
                 tool=TRANSLATOR_TOOL,
                 metadata={
                     "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                     "type": "SoftwareSourceCode",
                     "issueTracker": "https://github.com/npm/npm/issues",
                     "author": [
                         {
                             "type": "Person",
                             "name": "Isaac Z. Schlueter",
                             "email": "i@izs.me",
                             "url": "http://blog.izs.me",
                         }
                     ],
                     "codeRepository": "git+https://github.com/npm/npm",
                     "description": "a package manager for JavaScript",
                     "license": "https://spdx.org/licenses/Artistic-2.0",
                     "version": "5.0.3",
                     "name": "npm",
                     "keywords": [
                         "install",
                         "modules",
                         "package manager",
                         "package.json",
                     ],
                     "url": "https://docs.npmjs.com/",
                 },
             ),
         ]
 
         for result in results:
             del result.tool["id"]
 
         # The assertion below returns False sometimes because of nested lists
         self.assertEqual(expected_results, results)
 
     def test_npm_bugs_normalization(self):
         # valid dictionary
         package_json = b"""{
             "name": "foo",
             "bugs": {
                 "url": "https://github.com/owner/project/issues",
                 "email": "foo@example.com"
             }
         }"""
         result = self.npm_mapping.translate(package_json)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "name": "foo",
                 "issueTracker": "https://github.com/owner/project/issues",
                 "type": "SoftwareSourceCode",
             },
         )
 
         # "invalid" dictionary
         package_json = b"""{
             "name": "foo",
             "bugs": {
                 "email": "foo@example.com"
             }
         }"""
         result = self.npm_mapping.translate(package_json)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "name": "foo",
                 "type": "SoftwareSourceCode",
             },
         )
 
         # string
         package_json = b"""{
             "name": "foo",
             "bugs": "https://github.com/owner/project/issues"
         }"""
         result = self.npm_mapping.translate(package_json)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "name": "foo",
                 "issueTracker": "https://github.com/owner/project/issues",
                 "type": "SoftwareSourceCode",
             },
         )
 
     def test_npm_repository_normalization(self):
         # normal
         package_json = b"""{
             "name": "foo",
             "repository": {
                 "type" : "git",
                 "url" : "https://github.com/npm/cli.git"
             }
         }"""
         result = self.npm_mapping.translate(package_json)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "name": "foo",
                 "codeRepository": "git+https://github.com/npm/cli.git",
                 "type": "SoftwareSourceCode",
             },
         )
 
         # missing url
         package_json = b"""{
             "name": "foo",
             "repository": {
                 "type" : "git"
             }
         }"""
         result = self.npm_mapping.translate(package_json)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "name": "foo",
                 "type": "SoftwareSourceCode",
             },
         )
 
         # github shortcut
         package_json = b"""{
             "name": "foo",
             "repository": "github:npm/cli"
         }"""
         result = self.npm_mapping.translate(package_json)
         expected_result = {
             "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
             "name": "foo",
             "codeRepository": "git+https://github.com/npm/cli.git",
             "type": "SoftwareSourceCode",
         }
         self.assertEqual(result, expected_result)
 
         # github shortshortcut
         package_json = b"""{
             "name": "foo",
             "repository": "npm/cli"
         }"""
         result = self.npm_mapping.translate(package_json)
         self.assertEqual(result, expected_result)
 
         # gitlab shortcut
         package_json = b"""{
             "name": "foo",
             "repository": "gitlab:user/repo"
         }"""
         result = self.npm_mapping.translate(package_json)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "name": "foo",
                 "codeRepository": "git+https://gitlab.com/user/repo.git",
                 "type": "SoftwareSourceCode",
             },
         )
 
     def test_detect_metadata_package_json(self):
         # given
         df = [
             {
                 "sha1_git": b"abc",
                 "name": b"index.js",
                 "target": b"abc",
                 "length": 897,
                 "status": "visible",
                 "type": "file",
                 "perms": 33188,
                 "dir_id": b"dir_a",
                 "sha1": b"bcd",
             },
             {
                 "sha1_git": b"aab",
                 "name": b"package.json",
                 "target": b"aab",
                 "length": 712,
                 "status": "visible",
                 "type": "file",
                 "perms": 33188,
                 "dir_id": b"dir_a",
                 "sha1": b"cde",
             },
         ]
         # when
         results = detect_metadata(df)
 
         expected_results = {"NpmMapping": [b"cde"]}
         # then
         self.assertEqual(expected_results, results)
 
+    def test_detect_metadata_codemeta_json_uppercase(self):
+        # given
+        df = [
+            {
+                "sha1_git": b"abc",
+                "name": b"index.html",
+                "target": b"abc",
+                "length": 897,
+                "status": "visible",
+                "type": "file",
+                "perms": 33188,
+                "dir_id": b"dir_a",
+                "sha1": b"bcd",
+            },
+            {
+                "sha1_git": b"aab",
+                "name": b"CODEMETA.json",
+                "target": b"aab",
+                "length": 712,
+                "status": "visible",
+                "type": "file",
+                "perms": 33188,
+                "dir_id": b"dir_a",
+                "sha1": b"bcd",
+            },
+        ]
+        # when
+        results = detect_metadata(df)
+
+        expected_results = {"CodemetaMapping": [b"bcd"]}
+        # then
+        self.assertEqual(expected_results, results)
+
     def test_compute_metadata_valid_codemeta(self):
         raw_content = b"""{
             "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
             "@type": "SoftwareSourceCode",
             "identifier": "CodeMeta",
             "description": "CodeMeta is a concept vocabulary that can be used to standardize the exchange of software metadata across repositories and organizations.",
             "name": "CodeMeta: Minimal metadata schemas for science software and code, in JSON-LD",
             "codeRepository": "https://github.com/codemeta/codemeta",
             "issueTracker": "https://github.com/codemeta/codemeta/issues",
             "license": "https://spdx.org/licenses/Apache-2.0",
             "version": "2.0",
             "author": [
               {
                 "@type": "Person",
                 "givenName": "Carl",
                 "familyName": "Boettiger",
                 "email": "cboettig@gmail.com",
                 "@id": "http://orcid.org/0000-0002-1642-628X"
               },
               {
                 "@type": "Person",
                 "givenName": "Matthew B.",
                 "familyName": "Jones",
                 "email": "jones@nceas.ucsb.edu",
                 "@id": "http://orcid.org/0000-0003-0077-4738"
               }
             ],
             "maintainer": {
               "@type": "Person",
               "givenName": "Carl",
               "familyName": "Boettiger",
               "email": "cboettig@gmail.com",
               "@id": "http://orcid.org/0000-0002-1642-628X"
             },
             "contIntegration": "https://travis-ci.org/codemeta/codemeta",
             "developmentStatus": "active",
             "downloadUrl": "https://github.com/codemeta/codemeta/archive/2.0.zip",
             "funder": {
                 "@id": "https://doi.org/10.13039/100000001",
                 "@type": "Organization",
                 "name": "National Science Foundation"
             },
             "funding":"1549758; Codemeta: A Rosetta Stone for Metadata in Scientific Software",
             "keywords": [
               "metadata",
               "software"
             ],
             "version":"2.0",
             "dateCreated":"2017-06-05",
             "datePublished":"2017-06-05",
             "programmingLanguage": "JSON-LD"
           }"""  # noqa
         expected_result = {
             "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
             "type": "SoftwareSourceCode",
             "identifier": "CodeMeta",
             "description": "CodeMeta is a concept vocabulary that can "
             "be used to standardize the exchange of software metadata "
             "across repositories and organizations.",
             "name": "CodeMeta: Minimal metadata schemas for science "
             "software and code, in JSON-LD",
             "codeRepository": "https://github.com/codemeta/codemeta",
             "issueTracker": "https://github.com/codemeta/codemeta/issues",
             "license": "https://spdx.org/licenses/Apache-2.0",
             "version": "2.0",
             "author": [
                 {
                     "type": "Person",
                     "givenName": "Carl",
                     "familyName": "Boettiger",
                     "email": "cboettig@gmail.com",
                     "id": "http://orcid.org/0000-0002-1642-628X",
                 },
                 {
                     "type": "Person",
                     "givenName": "Matthew B.",
                     "familyName": "Jones",
                     "email": "jones@nceas.ucsb.edu",
                     "id": "http://orcid.org/0000-0003-0077-4738",
                 },
             ],
             "maintainer": {
                 "type": "Person",
                 "givenName": "Carl",
                 "familyName": "Boettiger",
                 "email": "cboettig@gmail.com",
                 "id": "http://orcid.org/0000-0002-1642-628X",
             },
             "contIntegration": "https://travis-ci.org/codemeta/codemeta",
             "developmentStatus": "active",
             "downloadUrl": "https://github.com/codemeta/codemeta/archive/2.0.zip",
             "funder": {
                 "id": "https://doi.org/10.13039/100000001",
                 "type": "Organization",
                 "name": "National Science Foundation",
             },
             "funding": "1549758; Codemeta: A Rosetta Stone for Metadata "
             "in Scientific Software",
             "keywords": ["metadata", "software"],
             "version": "2.0",
             "dateCreated": "2017-06-05",
             "datePublished": "2017-06-05",
             "programmingLanguage": "JSON-LD",
         }
         result = self.codemeta_mapping.translate(raw_content)
         self.assertEqual(result, expected_result)
 
     def test_compute_metadata_codemeta_alternate_context(self):
         raw_content = b"""{
             "@context": "https://raw.githubusercontent.com/codemeta/codemeta/master/codemeta.jsonld",
             "@type": "SoftwareSourceCode",
             "identifier": "CodeMeta"
         }"""  # noqa
         expected_result = {
             "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
             "type": "SoftwareSourceCode",
             "identifier": "CodeMeta",
         }
         result = self.codemeta_mapping.translate(raw_content)
         self.assertEqual(result, expected_result)
 
     def test_compute_metadata_maven(self):
         raw_content = b"""
         <project>
           <name>Maven Default Project</name>
           <modelVersion>4.0.0</modelVersion>
           <groupId>com.mycompany.app</groupId>
           <artifactId>my-app</artifactId>
           <version>1.2.3</version>
           <repositories>
             <repository>
               <id>central</id>
               <name>Maven Repository Switchboard</name>
               <layout>default</layout>
               <url>http://repo1.maven.org/maven2</url>
               <snapshots>
                 <enabled>false</enabled>
               </snapshots>
             </repository>
           </repositories>
           <licenses>
             <license>
               <name>Apache License, Version 2.0</name>
               <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
               <distribution>repo</distribution>
               <comments>A business-friendly OSS license</comments>
             </license>
           </licenses>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "Maven Default Project",
                 "identifier": "com.mycompany.app",
                 "version": "1.2.3",
                 "license": "https://www.apache.org/licenses/LICENSE-2.0.txt",
                 "codeRepository": (
                     "http://repo1.maven.org/maven2/com/mycompany/app/my-app"
                 ),
             },
         )
 
     def test_compute_metadata_maven_empty(self):
         raw_content = b"""
         <project>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
             },
         )
 
     def test_compute_metadata_maven_almost_empty(self):
         raw_content = b"""
         <project>
           <foo/>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
             },
         )
 
     def test_compute_metadata_maven_invalid_xml(self):
         expected_warning = (
             "WARNING:swh.indexer.metadata_dictionary.maven.MavenMapping:"
             "Error parsing XML from foo"
         )
 
         raw_content = b"""
         <project>"""
         with self.assertLogs("swh.indexer.metadata_dictionary", level="WARNING") as cm:
             result = MAPPINGS["MavenMapping"]("foo").translate(raw_content)
             self.assertEqual(cm.output, [expected_warning])
         self.assertEqual(result, None)
 
         raw_content = b"""
         """
         with self.assertLogs("swh.indexer.metadata_dictionary", level="WARNING") as cm:
             result = MAPPINGS["MavenMapping"]("foo").translate(raw_content)
             self.assertEqual(cm.output, [expected_warning])
         self.assertEqual(result, None)
 
     def test_compute_metadata_maven_unknown_encoding(self):
         expected_warning = (
             "WARNING:swh.indexer.metadata_dictionary.maven.MavenMapping:"
             "Error detecting XML encoding from foo"
         )
 
         raw_content = b"""<?xml version="1.0" encoding="foo"?>
         <project>
         </project>"""
         with self.assertLogs("swh.indexer.metadata_dictionary", level="WARNING") as cm:
             result = MAPPINGS["MavenMapping"]("foo").translate(raw_content)
             self.assertEqual(cm.output, [expected_warning])
         self.assertEqual(result, None)
 
         raw_content = b"""<?xml version="1.0" encoding="UTF-7"?>
         <project>
         </project>"""
         with self.assertLogs("swh.indexer.metadata_dictionary", level="WARNING") as cm:
             result = MAPPINGS["MavenMapping"]("foo").translate(raw_content)
             self.assertEqual(cm.output, [expected_warning])
         self.assertEqual(result, None)
 
     def test_compute_metadata_maven_invalid_encoding(self):
         expected_warning = (
             "WARNING:swh.indexer.metadata_dictionary.maven.MavenMapping:"
             "Error unidecoding XML from foo"
         )
 
         raw_content = b"""<?xml version="1.0" encoding="UTF-8"?>
         <foo\xe5ct>
         </foo>"""
         with self.assertLogs("swh.indexer.metadata_dictionary", level="WARNING") as cm:
             result = MAPPINGS["MavenMapping"]("foo").translate(raw_content)
             self.assertEqual(cm.output, [expected_warning])
         self.assertEqual(result, None)
 
     def test_compute_metadata_maven_minimal(self):
         raw_content = b"""
         <project>
           <name>Maven Default Project</name>
           <modelVersion>4.0.0</modelVersion>
           <groupId>com.mycompany.app</groupId>
           <artifactId>my-app</artifactId>
           <version>1.2.3</version>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "Maven Default Project",
                 "identifier": "com.mycompany.app",
                 "version": "1.2.3",
                 "codeRepository": (
                     "https://repo.maven.apache.org/maven2/com/mycompany/app/my-app"
                 ),
             },
         )
 
     def test_compute_metadata_maven_empty_nodes(self):
         raw_content = b"""
         <project>
           <name>Maven Default Project</name>
           <modelVersion>4.0.0</modelVersion>
           <groupId>com.mycompany.app</groupId>
           <artifactId>my-app</artifactId>
           <version>1.2.3</version>
           <repositories>
           </repositories>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "Maven Default Project",
                 "identifier": "com.mycompany.app",
                 "version": "1.2.3",
                 "codeRepository": (
                     "https://repo.maven.apache.org/maven2/com/mycompany/app/my-app"
                 ),
             },
         )
 
         raw_content = b"""
         <project>
           <name>Maven Default Project</name>
           <modelVersion>4.0.0</modelVersion>
           <groupId>com.mycompany.app</groupId>
           <artifactId>my-app</artifactId>
           <version></version>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "Maven Default Project",
                 "identifier": "com.mycompany.app",
                 "codeRepository": (
                     "https://repo.maven.apache.org/maven2/com/mycompany/app/my-app"
                 ),
             },
         )
 
         raw_content = b"""
         <project>
           <name></name>
           <modelVersion>4.0.0</modelVersion>
           <groupId>com.mycompany.app</groupId>
           <artifactId>my-app</artifactId>
           <version>1.2.3</version>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "identifier": "com.mycompany.app",
                 "version": "1.2.3",
                 "codeRepository": (
                     "https://repo.maven.apache.org/maven2/com/mycompany/app/my-app"
                 ),
             },
         )
 
         raw_content = b"""
         <project>
           <name>Maven Default Project</name>
           <modelVersion>4.0.0</modelVersion>
           <groupId>com.mycompany.app</groupId>
           <artifactId>my-app</artifactId>
           <version>1.2.3</version>
           <licenses>
           </licenses>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "Maven Default Project",
                 "identifier": "com.mycompany.app",
                 "version": "1.2.3",
                 "codeRepository": (
                     "https://repo.maven.apache.org/maven2/com/mycompany/app/my-app"
                 ),
             },
         )
 
         raw_content = b"""
         <project>
           <groupId></groupId>
           <version>1.2.3</version>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "version": "1.2.3",
             },
         )
 
     def test_compute_metadata_maven_invalid_licenses(self):
         raw_content = b"""
         <project>
           <name>Maven Default Project</name>
           <modelVersion>4.0.0</modelVersion>
           <groupId>com.mycompany.app</groupId>
           <artifactId>my-app</artifactId>
           <version>1.2.3</version>
           <licenses>
             foo
           </licenses>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "Maven Default Project",
                 "identifier": "com.mycompany.app",
                 "version": "1.2.3",
                 "codeRepository": (
                     "https://repo.maven.apache.org/maven2/com/mycompany/app/my-app"
                 ),
             },
         )
 
     def test_compute_metadata_maven_multiple(self):
         """Tests when there are multiple code repos and licenses."""
         raw_content = b"""
         <project>
           <name>Maven Default Project</name>
           <modelVersion>4.0.0</modelVersion>
           <groupId>com.mycompany.app</groupId>
           <artifactId>my-app</artifactId>
           <version>1.2.3</version>
           <repositories>
             <repository>
               <id>central</id>
               <name>Maven Repository Switchboard</name>
               <layout>default</layout>
               <url>http://repo1.maven.org/maven2</url>
               <snapshots>
                 <enabled>false</enabled>
               </snapshots>
             </repository>
             <repository>
               <id>example</id>
               <name>Example Maven Repo</name>
               <layout>default</layout>
               <url>http://example.org/maven2</url>
             </repository>
           </repositories>
           <licenses>
             <license>
               <name>Apache License, Version 2.0</name>
               <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
               <distribution>repo</distribution>
               <comments>A business-friendly OSS license</comments>
             </license>
             <license>
               <name>MIT license</name>
               <url>https://opensource.org/licenses/MIT</url>
             </license>
           </licenses>
         </project>"""
         result = self.maven_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "Maven Default Project",
                 "identifier": "com.mycompany.app",
                 "version": "1.2.3",
                 "license": [
                     "https://www.apache.org/licenses/LICENSE-2.0.txt",
                     "https://opensource.org/licenses/MIT",
                 ],
                 "codeRepository": [
                     "http://repo1.maven.org/maven2/com/mycompany/app/my-app",
                     "http://example.org/maven2/com/mycompany/app/my-app",
                 ],
             },
         )
 
     def test_compute_metadata_pkginfo(self):
         raw_content = b"""\
 Metadata-Version: 2.1
 Name: swh.core
 Version: 0.0.49
 Summary: Software Heritage core utilities
 Home-page: https://forge.softwareheritage.org/diffusion/DCORE/
 Author: Software Heritage developers
 Author-email: swh-devel@inria.fr
 License: UNKNOWN
 Project-URL: Bug Reports, https://forge.softwareheritage.org/maniphest
 Project-URL: Funding, https://www.softwareheritage.org/donate
 Project-URL: Source, https://forge.softwareheritage.org/source/swh-core
 Description: swh-core
         ========
        \x20
         core library for swh's modules:
         - config parser
         - hash computations
         - serialization
         - logging mechanism
        \x20
 Platform: UNKNOWN
 Classifier: Programming Language :: Python :: 3
 Classifier: Intended Audience :: Developers
 Classifier: License :: OSI Approved :: GNU General Public License v3 (GPLv3)
 Classifier: Operating System :: OS Independent
 Classifier: Development Status :: 5 - Production/Stable
 Description-Content-Type: text/markdown
 Provides-Extra: testing
 """  # noqa
         result = self.pkginfo_mapping.translate(raw_content)
         self.assertCountEqual(
             result["description"],
             [
                 "Software Heritage core utilities",  # note the comma here
                 "swh-core\n"
                 "========\n"
                 "\n"
                 "core library for swh's modules:\n"
                 "- config parser\n"
                 "- hash computations\n"
                 "- serialization\n"
                 "- logging mechanism\n"
                 "",
             ],
             result,
         )
         del result["description"]
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "url": "https://forge.softwareheritage.org/diffusion/DCORE/",
                 "name": "swh.core",
                 "author": [
                     {
                         "type": "Person",
                         "name": "Software Heritage developers",
                         "email": "swh-devel@inria.fr",
                     }
                 ],
                 "version": "0.0.49",
             },
         )
 
     def test_compute_metadata_pkginfo_utf8(self):
         raw_content = b"""\
 Metadata-Version: 1.1
 Name: snowpyt
 Description-Content-Type: UNKNOWN
 Description: foo
         Hydrology N\xc2\xb083
 """  # noqa
         result = self.pkginfo_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "snowpyt",
                 "description": "foo\nHydrology N°83",
             },
         )
 
     def test_compute_metadata_pkginfo_keywords(self):
         raw_content = b"""\
 Metadata-Version: 2.1
 Name: foo
 Keywords: foo bar baz
 """  # noqa
         result = self.pkginfo_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "foo",
                 "keywords": ["foo", "bar", "baz"],
             },
         )
 
     def test_compute_metadata_pkginfo_license(self):
         raw_content = b"""\
 Metadata-Version: 2.1
 Name: foo
 License: MIT
 """  # noqa
         result = self.pkginfo_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "foo",
                 "license": "MIT",
             },
         )
 
     def test_gemspec_base(self):
         raw_content = b"""
 Gem::Specification.new do |s|
   s.name        = 'example'
   s.version     = '0.1.0'
   s.licenses    = ['MIT']
   s.summary     = "This is an example!"
   s.description = "Much longer explanation of the example!"
   s.authors     = ["Ruby Coder"]
   s.email       = 'rubycoder@example.com'
   s.files       = ["lib/example.rb"]
   s.homepage    = 'https://rubygems.org/gems/example'
   s.metadata    = { "source_code_uri" => "https://github.com/example/example" }
 end"""
         result = self.gemspec_mapping.translate(raw_content)
         self.assertCountEqual(
             result.pop("description"),
             ["This is an example!", "Much longer explanation of the example!"],
         )
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "author": [{"type": "Person", "name": "Ruby Coder"}],
                 "name": "example",
                 "license": "https://spdx.org/licenses/MIT",
                 "codeRepository": "https://rubygems.org/gems/example",
                 "email": "rubycoder@example.com",
                 "version": "0.1.0",
             },
         )
 
     def test_gemspec_two_author_fields(self):
         raw_content = b"""
 Gem::Specification.new do |s|
   s.authors     = ["Ruby Coder1"]
   s.author      = "Ruby Coder2"
 end"""
         result = self.gemspec_mapping.translate(raw_content)
         self.assertCountEqual(
             result.pop("author"),
             [
                 {"type": "Person", "name": "Ruby Coder1"},
                 {"type": "Person", "name": "Ruby Coder2"},
             ],
         )
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
             },
         )
 
     def test_gemspec_invalid_author(self):
         raw_content = b"""
 Gem::Specification.new do |s|
   s.author      = ["Ruby Coder"]
 end"""
         result = self.gemspec_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
             },
         )
         raw_content = b"""
 Gem::Specification.new do |s|
   s.author      = "Ruby Coder1",
 end"""
         result = self.gemspec_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
             },
         )
         raw_content = b"""
 Gem::Specification.new do |s|
   s.authors     = ["Ruby Coder1", ["Ruby Coder2"]]
 end"""
         result = self.gemspec_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "author": [{"type": "Person", "name": "Ruby Coder1"}],
             },
         )
 
     def test_gemspec_alternative_header(self):
         raw_content = b"""
 require './lib/version'
 
 Gem::Specification.new { |s|
   s.name = 'rb-system-with-aliases'
   s.summary = 'execute system commands with aliases'
 }
 """
         result = self.gemspec_mapping.translate(raw_content)
         self.assertEqual(
             result,
             {
                 "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
                 "type": "SoftwareSourceCode",
                 "name": "rb-system-with-aliases",
                 "description": "execute system commands with aliases",
             },
         )
 
     @settings(suppress_health_check=[HealthCheck.too_slow])
     @given(json_document_strategy(keys=list(NpmMapping.mapping)))
     def test_npm_adversarial(self, doc):
         raw = json.dumps(doc).encode()
         self.npm_mapping.translate(raw)
 
     @settings(suppress_health_check=[HealthCheck.too_slow])
     @given(json_document_strategy(keys=CODEMETA_TERMS))
     def test_codemeta_adversarial(self, doc):
         raw = json.dumps(doc).encode()
         self.codemeta_mapping.translate(raw)
 
     @settings(suppress_health_check=[HealthCheck.too_slow])
     @given(
         xml_document_strategy(
             keys=list(MavenMapping.mapping),
             root="project",
             xmlns="http://maven.apache.org/POM/4.0.0",
         )
     )
     def test_maven_adversarial(self, doc):
         self.maven_mapping.translate(doc)
 
     @settings(suppress_health_check=[HealthCheck.too_slow])
     @given(
         strategies.dictionaries(
             # keys
             strategies.one_of(
                 strategies.text(), *map(strategies.just, GemspecMapping.mapping)
             ),
             # values
             strategies.recursive(
                 strategies.characters(),
                 lambda children: strategies.lists(children, min_size=1),
             ),
         )
     )
     def test_gemspec_adversarial(self, doc):
         parts = [b"Gem::Specification.new do |s|\n"]
         for (k, v) in doc.items():
             parts.append("  s.{} = {}\n".format(k, repr(v)).encode())
         parts.append(b"end\n")
         self.gemspec_mapping.translate(b"".join(parts))
 
     def test_revision_metadata_indexer(self):
         metadata_indexer = RevisionMetadataIndexer(config=REVISION_METADATA_CONFIG)
         fill_obj_storage(metadata_indexer.objstorage)
         fill_storage(metadata_indexer.storage)
 
         tool = metadata_indexer.idx_storage.indexer_configuration_get(
             {f"tool_{k}": v for (k, v) in TRANSLATOR_TOOL.items()}
         )
         assert tool is not None
         rev = REVISION
         assert rev.directory == DIRECTORY2.id
 
         metadata_indexer.idx_storage.content_metadata_add(
             [
                 ContentMetadataRow(
                     id=DIRECTORY2.entries[0].target,
                     indexer_configuration_id=tool["id"],
                     metadata=YARN_PARSER_METADATA,
                 )
             ]
         )
 
         metadata_indexer.run([rev.id])
 
         results = list(
             metadata_indexer.idx_storage.revision_intrinsic_metadata_get([REVISION.id])
         )
 
         expected_results = [
             RevisionIntrinsicMetadataRow(
                 id=rev.id,
                 tool=TRANSLATOR_TOOL,
                 metadata=YARN_PARSER_METADATA,
                 mappings=["npm"],
             )
         ]
 
         for result in results:
             del result.tool["id"]
 
         # then
         self.assertEqual(results, expected_results)
 
     def test_revision_metadata_indexer_single_root_dir(self):
         metadata_indexer = RevisionMetadataIndexer(config=REVISION_METADATA_CONFIG)
         fill_obj_storage(metadata_indexer.objstorage)
         fill_storage(metadata_indexer.storage)
 
         # Add a parent directory, that is the only directory at the root
         # of the revision
         rev = REVISION
         assert rev.directory == DIRECTORY2.id
 
         directory = Directory(
             entries=(
                 DirectoryEntry(
                     name=b"foobar-1.0.0", type="dir", target=rev.directory, perms=16384,
                 ),
             ),
         )
         assert directory.id is not None
         metadata_indexer.storage.directory_add([directory])
 
         new_rev_dict = {**rev.to_dict(), "directory": directory.id}
         new_rev_dict.pop("id")
         new_rev = Revision.from_dict(new_rev_dict)
         metadata_indexer.storage.revision_add([new_rev])
 
         tool = metadata_indexer.idx_storage.indexer_configuration_get(
             {f"tool_{k}": v for (k, v) in TRANSLATOR_TOOL.items()}
         )
         assert tool is not None
 
         metadata_indexer.idx_storage.content_metadata_add(
             [
                 ContentMetadataRow(
                     id=DIRECTORY2.entries[0].target,
                     indexer_configuration_id=tool["id"],
                     metadata=YARN_PARSER_METADATA,
                 )
             ]
         )
 
         metadata_indexer.run([new_rev.id])
 
         results = list(
             metadata_indexer.idx_storage.revision_intrinsic_metadata_get([new_rev.id])
         )
 
         expected_results = [
             RevisionIntrinsicMetadataRow(
                 id=new_rev.id,
                 tool=TRANSLATOR_TOOL,
                 metadata=YARN_PARSER_METADATA,
                 mappings=["npm"],
             )
         ]
 
         for result in results:
             del result.tool["id"]
 
         # then
         self.assertEqual(results, expected_results)