diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -67,6 +67,7 @@
         lister.phabricator=swh.lister.phabricator:register
         lister.pypi=swh.lister.pypi:register
         lister.launchpad=swh.lister.launchpad:register
+        lister.gitea=swh.lister.gitea:register
     """,
     classifiers=[
         "Programming Language :: Python :: 3",
diff --git a/swh/lister/gitea/__init__.py b/swh/lister/gitea/__init__.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/__init__.py
@@ -0,0 +1,14 @@
+# Copyright (C) 2020 the Software Heritage developers
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+
+def register():
+    from .models import GiteaModel
+    from .lister import GiteaLister
+
+    return {
+        "models": [GiteaModel],
+        "lister": GiteaLister,
+        "task_modules": ["%s.tasks" % __name__],
+    }
diff --git a/swh/lister/gitea/lister.py b/swh/lister/gitea/lister.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/lister.py
@@ -0,0 +1,91 @@
+# Copyright (C) 2018-2020 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
+
+from ..core.page_by_page_lister import PageByPageHttpLister
+from .models import GiteaModel
+
+from typing import Any, Dict, List, Tuple, MutableMapping, Optional
+from requests import Response
+import re
+from urllib3.util import parse_url
+
+
+class GiteaLister(PageByPageHttpLister):
+    # Template path expecting an integer that represents the page id
+    PATH_TEMPLATE = "repos/search?page=%d&sort=id"
+    DEFAULT_URL = "https://try.gitea.io/api/v1/"
+    MODEL = GiteaModel
+    LISTER_NAME = "gitea"
+
+    def __init__(
+        self, url=None, instance=None, override_config=None, order="asc", limit=3
+    ):
+        super().__init__(url=url, override_config=override_config)
+        if instance is None:
+            instance = parse_url(self.url).host
+        self.instance = instance
+        self.PATH_TEMPLATE = "%s&order=%s&limit=%s" % (
+            self.PATH_TEMPLATE,
+            order,
+            limit,
+        )
+
+    def get_model_from_repo(self, repo: Dict[str, Any]) -> Dict[str, Any]:
+        return {
+            "instance": self.instance,
+            "uid": repo["id"],
+            "name": repo["name"],
+            "full_name": repo["full_name"],
+            "html_url": repo["html_url"],
+            "origin_url": repo["clone_url"],
+            "origin_type": "git",
+        }
+
+    def uid(self, id: str) -> str:
+        return f"{self.instance}/{id}"
+
+    def get_next_target_from_response(self, response: Response) -> Optional[int]:
+        """Determine the next page identifier.
+
+        """
+        if "next" in response.links:
+            next_url = response.links["next"]["url"]
+            return self.get_page_from_url(next_url)
+        return None
+
+    def get_page_from_url(self, url: str) -> int:
+        page_re = re.compile(r"^.*/search\?.*page=(\d+)")
+        return int(page_re.match(url).group(1))  # type: ignore
+
+    def transport_response_simplified(self, response: Response) -> List[Dict[str, Any]]:
+        repos = response.json()["data"]
+        return [self.get_model_from_repo(repo) for repo in repos]
+
+    def get_pages_information(
+        self,
+    ) -> Tuple[Optional[int], Optional[int], Optional[int]]:
+        """Determine pages information.
+
+        """
+        response = self.transport_head(identifier=1)  # type: ignore
+        if not response.ok:
+            raise ValueError(
+                "Problem during information fetch: %s" % response.status_code
+            )
+        h = response.headers
+        return (
+            self._get_int(h, "x-total-count"),
+            int(self.get_page_from_url(response.links["last"]["url"])),
+            self._get_int(h, "x-per-page"),
+        )
+
+    def _get_int(self, headers: MutableMapping[str, Any], key: str) -> Optional[int]:
+        _val = headers.get(key)
+        if _val:
+            return int(_val)
+        return None
+
+    def run(self, min_bound=1, max_bound=None, check_existence=False):
+        return super().run(min_bound, max_bound, check_existence)
diff --git a/swh/lister/gitea/models.py b/swh/lister/gitea/models.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/models.py
@@ -0,0 +1,18 @@
+# Copyright (C) 2020 the Software Heritage developers
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+from sqlalchemy import Column, Integer, String
+
+from ..core.models import ModelBase
+
+
+class GiteaModel(ModelBase):
+    """a Gitea repository from a gitea instance
+
+    """
+
+    __tablename__ = "gitea_repo"
+
+    uid = Column(Integer, primary_key=True)
+    instance = Column(String, index=True)
diff --git a/swh/lister/gitea/tasks.py b/swh/lister/gitea/tasks.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/tasks.py
@@ -0,0 +1,53 @@
+# Copyright (C) 2020 the Software Heritage developers
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+import random
+
+from celery import group, shared_task
+
+from .. import utils
+from .lister import GiteaLister
+
+
+NBPAGES = 10
+
+
+@shared_task(name=__name__ + ".IncrementalGiteaLister")
+def list_gitea_incremental(**lister_args):
+    """Incremental update of a Gitea instance"""
+    lister_args["sort"] = "desc"
+    lister = GiteaLister(**lister_args)
+    total_pages = lister.get_pages_information()[1]
+    # stopping as soon as existing origins for that instance are detected
+    return lister.run(min_bound=1, max_bound=total_pages, check_existence=True)
+
+
+@shared_task(name=__name__ + ".RangeGiteaLister")
+def _range_gitea_lister(start, end, **lister_args):
+    lister = GiteaLister(**lister_args)
+    return lister.run(min_bound=start, max_bound=end)
+
+
+@shared_task(name=__name__ + ".FullGiteaRelister", bind=True)
+def list_gitea_full(self, **lister_args):
+    """Full update of a Gitea instance"""
+    lister = GiteaLister(**lister_args)
+    _, total_pages, _ = lister.get_pages_information()
+    ranges = list(utils.split_range(total_pages, NBPAGES))
+    random.shuffle(ranges)
+    promise = group(
+        _range_gitea_lister.s(minv, maxv, **lister_args) for minv, maxv in ranges
+    )()
+    self.log.debug("%s OK (spawned %s subtasks)" % (self.name, len(ranges)))
+    try:
+        promise.save()
+    except (NotImplementedError, AttributeError):
+        self.log.info("Unable to call save_group with current result backend.")
+    # FIXME: what to do in terms of return here?
+    return promise.id
+
+
+@shared_task(name=__name__ + ".ping")
+def _ping():
+    return "OK"
diff --git a/swh/lister/gitea/tests/__init__.py b/swh/lister/gitea/tests/__init__.py
new file mode 100644
diff --git a/swh/lister/gitea/tests/conftest.py b/swh/lister/gitea/tests/conftest.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/tests/conftest.py
@@ -0,0 +1,6 @@
+# Copyright (C) 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
+
+from swh.lister.core.tests.conftest import *  # noqa
diff --git a/swh/lister/gitea/tests/data/https_try.gitea.io/api_empty_response.json b/swh/lister/gitea/tests/data/https_try.gitea.io/api_empty_response.json
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/tests/data/https_try.gitea.io/api_empty_response.json
@@ -0,0 +1,4 @@
+{
+    "ok": true,
+    "data": []
+}
\ No newline at end of file
diff --git a/swh/lister/gitea/tests/data/https_try.gitea.io/api_response.json b/swh/lister/gitea/tests/data/https_try.gitea.io/api_response.json
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/tests/data/https_try.gitea.io/api_response.json
@@ -0,0 +1,182 @@
+{
+  "ok": true,
+  "data": [
+    {
+      "id": 5017,
+      "owner": {
+        "id": 1609,
+        "login": "JonasFranzDEV",
+        "full_name": "",
+        "email": "info@jonasfranz.software",
+        "avatar_url": "https://try.gitea.io/user/avatar/JonasFranzDEV/-1",
+        "language": "de-DE",
+        "is_admin": false,
+        "last_login": "2019-10-19T10:58:29Z",
+        "created": "2017-06-25T17:43:19Z",
+        "username": "JonasFranzDEV"
+      },
+      "name": "drone-gitea-release",
+      "full_name": "JonasFranzDEV/drone-gitea-release",
+      "description": "",
+      "empty": false,
+      "private": false,
+      "fork": false,
+      "template": false,
+      "parent": null,
+      "mirror": false,
+      "size": 380,
+      "html_url": "https://try.gitea.io/JonasFranzDEV/drone-gitea-release",
+      "ssh_url": "git@try.gitea.io:JonasFranzDEV/drone-gitea-release.git",
+      "clone_url": "https://try.gitea.io/JonasFranzDEV/drone-gitea-release.git",
+      "original_url": "",
+      "website": "",
+      "stars_count": 0,
+      "forks_count": 0,
+      "watchers_count": 1,
+      "open_issues_count": 1,
+      "open_pr_counter": 0,
+      "release_counter": 2,
+      "default_branch": "master",
+      "archived": false,
+      "created_at": "2018-03-30T19:34:44Z",
+      "updated_at": "2018-05-29T20:09:40Z",
+      "permissions": {
+        "admin": false,
+        "push": false,
+        "pull": true
+      },
+      "has_issues": true,
+      "internal_tracker": {
+        "enable_time_tracker": true,
+        "allow_only_contributors_to_track_time": true,
+        "enable_issue_dependencies": true
+      },
+      "has_wiki": true,
+      "has_pull_requests": true,
+      "ignore_whitespace_conflicts": false,
+      "allow_merge_commits": false,
+      "allow_rebase": false,
+      "allow_rebase_explicit": true,
+      "allow_squash_merge": false,
+      "avatar_url": ""
+    },
+    {
+      "id": 5018,
+      "owner": {
+        "id": 4495,
+        "login": "nick.korsakov",
+        "full_name": "",
+        "email": "nick@korsakov.email",
+        "avatar_url": "https://try.gitea.io/user/avatar/nick.korsakov/-1",
+        "language": "ru-RU",
+        "is_admin": false,
+        "last_login": "2020-02-15T10:29:10Z",
+        "created": "2018-03-31T15:00:07Z",
+        "username": "nick.korsakov"
+      },
+      "name": "one",
+      "full_name": "nick.korsakov/one",
+      "description": "",
+      "empty": true,
+      "private": false,
+      "fork": false,
+      "template": false,
+      "parent": null,
+      "mirror": false,
+      "size": 0,
+      "html_url": "https://try.gitea.io/nick.korsakov/one",
+      "ssh_url": "git@try.gitea.io:nick.korsakov/one.git",
+      "clone_url": "https://try.gitea.io/nick.korsakov/one.git",
+      "original_url": "",
+      "website": "",
+      "stars_count": 0,
+      "forks_count": 0,
+      "watchers_count": 1,
+      "open_issues_count": 0,
+      "open_pr_counter": 0,
+      "release_counter": 0,
+      "default_branch": "master",
+      "archived": false,
+      "created_at": "2018-03-31T15:00:33Z",
+      "updated_at": "2018-03-31T15:00:33Z",
+      "permissions": {
+        "admin": false,
+        "push": false,
+        "pull": true
+      },
+      "has_issues": true,
+      "internal_tracker": {
+        "enable_time_tracker": true,
+        "allow_only_contributors_to_track_time": true,
+        "enable_issue_dependencies": true
+      },
+      "has_wiki": true,
+      "has_pull_requests": true,
+      "ignore_whitespace_conflicts": false,
+      "allow_merge_commits": false,
+      "allow_rebase": false,
+      "allow_rebase_explicit": true,
+      "allow_squash_merge": false,
+      "avatar_url": ""
+    },
+    {
+      "id": 5030,
+      "owner": {
+        "id": 1623,
+        "login": "xingshijun",
+        "full_name": "",
+        "email": "934302794@qq.com",
+        "avatar_url": "https://try.gitea.io/user/avatar/xingshijun/-1",
+        "language": "zh-CN",
+        "is_admin": false,
+        "last_login": "2019-06-15T12:28:43Z",
+        "created": "2017-06-28T02:19:23Z",
+        "username": "xingshijun"
+      },
+      "name": "lfzl",
+      "full_name": "xingshijun/lfzl",
+      "description": "",
+      "empty": false,
+      "private": false,
+      "fork": false,
+      "template": false,
+      "parent": null,
+      "mirror": false,
+      "size": 10990,
+      "html_url": "https://try.gitea.io/xingshijun/lfzl",
+      "ssh_url": "git@try.gitea.io:xingshijun/lfzl.git",
+      "clone_url": "https://try.gitea.io/xingshijun/lfzl.git",
+      "original_url": "",
+      "website": "",
+      "stars_count": 0,
+      "forks_count": 0,
+      "watchers_count": 1,
+      "open_issues_count": 0,
+      "open_pr_counter": 0,
+      "release_counter": 0,
+      "default_branch": "master",
+      "archived": false,
+      "created_at": "2018-04-02T08:34:08Z",
+      "updated_at": "2019-11-21T10:23:36Z",
+      "permissions": {
+        "admin": false,
+        "push": false,
+        "pull": true
+      },
+      "has_issues": true,
+      "internal_tracker": {
+        "enable_time_tracker": true,
+        "allow_only_contributors_to_track_time": true,
+        "enable_issue_dependencies": true
+      },
+      "has_wiki": true,
+      "has_pull_requests": true,
+      "ignore_whitespace_conflicts": false,
+      "allow_merge_commits": false,
+      "allow_rebase": false,
+      "allow_rebase_explicit": true,
+      "allow_squash_merge": false,
+      "avatar_url": ""
+    }
+  ]
+}
\ No newline at end of file
diff --git a/swh/lister/gitea/tests/data/https_try.gitea.io/api_v1_repos_search,page=1,sort=id,order=asc,limit=3 b/swh/lister/gitea/tests/data/https_try.gitea.io/api_v1_repos_search,page=1,sort=id,order=asc,limit=3
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/tests/data/https_try.gitea.io/api_v1_repos_search,page=1,sort=id,order=asc,limit=3
@@ -0,0 +1,182 @@
+{
+  "ok": true,
+  "data": [
+    {
+      "id": 5017,
+      "owner": {
+        "id": 1609,
+        "login": "JonasFranzDEV",
+        "full_name": "",
+        "email": "info@jonasfranz.software",
+        "avatar_url": "https://try.gitea.io/user/avatar/JonasFranzDEV/-1",
+        "language": "de-DE",
+        "is_admin": false,
+        "last_login": "2019-10-19T10:58:29Z",
+        "created": "2017-06-25T17:43:19Z",
+        "username": "JonasFranzDEV"
+      },
+      "name": "drone-gitea-release",
+      "full_name": "JonasFranzDEV/drone-gitea-release",
+      "description": "",
+      "empty": false,
+      "private": false,
+      "fork": false,
+      "template": false,
+      "parent": null,
+      "mirror": false,
+      "size": 380,
+      "html_url": "https://try.gitea.io/JonasFranzDEV/drone-gitea-release",
+      "ssh_url": "git@try.gitea.io:JonasFranzDEV/drone-gitea-release.git",
+      "clone_url": "https://try.gitea.io/JonasFranzDEV/drone-gitea-release.git",
+      "original_url": "",
+      "website": "",
+      "stars_count": 0,
+      "forks_count": 0,
+      "watchers_count": 1,
+      "open_issues_count": 1,
+      "open_pr_counter": 0,
+      "release_counter": 2,
+      "default_branch": "master",
+      "archived": false,
+      "created_at": "2018-03-30T19:34:44Z",
+      "updated_at": "2018-05-29T20:09:40Z",
+      "permissions": {
+        "admin": false,
+        "push": false,
+        "pull": true
+      },
+      "has_issues": true,
+      "internal_tracker": {
+        "enable_time_tracker": true,
+        "allow_only_contributors_to_track_time": true,
+        "enable_issue_dependencies": true
+      },
+      "has_wiki": true,
+      "has_pull_requests": true,
+      "ignore_whitespace_conflicts": false,
+      "allow_merge_commits": false,
+      "allow_rebase": false,
+      "allow_rebase_explicit": true,
+      "allow_squash_merge": false,
+      "avatar_url": ""
+    },
+    {
+      "id": 5018,
+      "owner": {
+        "id": 4495,
+        "login": "nick.korsakov",
+        "full_name": "",
+        "email": "nick@korsakov.email",
+        "avatar_url": "https://try.gitea.io/user/avatar/nick.korsakov/-1",
+        "language": "ru-RU",
+        "is_admin": false,
+        "last_login": "2020-02-15T10:29:10Z",
+        "created": "2018-03-31T15:00:07Z",
+        "username": "nick.korsakov"
+      },
+      "name": "one",
+      "full_name": "nick.korsakov/one",
+      "description": "",
+      "empty": true,
+      "private": false,
+      "fork": false,
+      "template": false,
+      "parent": null,
+      "mirror": false,
+      "size": 0,
+      "html_url": "https://try.gitea.io/nick.korsakov/one",
+      "ssh_url": "git@try.gitea.io:nick.korsakov/one.git",
+      "clone_url": "https://try.gitea.io/nick.korsakov/one.git",
+      "original_url": "",
+      "website": "",
+      "stars_count": 0,
+      "forks_count": 0,
+      "watchers_count": 1,
+      "open_issues_count": 0,
+      "open_pr_counter": 0,
+      "release_counter": 0,
+      "default_branch": "master",
+      "archived": false,
+      "created_at": "2018-03-31T15:00:33Z",
+      "updated_at": "2018-03-31T15:00:33Z",
+      "permissions": {
+        "admin": false,
+        "push": false,
+        "pull": true
+      },
+      "has_issues": true,
+      "internal_tracker": {
+        "enable_time_tracker": true,
+        "allow_only_contributors_to_track_time": true,
+        "enable_issue_dependencies": true
+      },
+      "has_wiki": true,
+      "has_pull_requests": true,
+      "ignore_whitespace_conflicts": false,
+      "allow_merge_commits": false,
+      "allow_rebase": false,
+      "allow_rebase_explicit": true,
+      "allow_squash_merge": false,
+      "avatar_url": ""
+    },
+    {
+      "id": 5030,
+      "owner": {
+        "id": 1623,
+        "login": "xingshijun",
+        "full_name": "",
+        "email": "934302794@qq.com",
+        "avatar_url": "https://try.gitea.io/user/avatar/xingshijun/-1",
+        "language": "zh-CN",
+        "is_admin": false,
+        "last_login": "2019-06-15T12:28:43Z",
+        "created": "2017-06-28T02:19:23Z",
+        "username": "xingshijun"
+      },
+      "name": "lfzl",
+      "full_name": "xingshijun/lfzl",
+      "description": "",
+      "empty": false,
+      "private": false,
+      "fork": false,
+      "template": false,
+      "parent": null,
+      "mirror": false,
+      "size": 10990,
+      "html_url": "https://try.gitea.io/xingshijun/lfzl",
+      "ssh_url": "git@try.gitea.io:xingshijun/lfzl.git",
+      "clone_url": "https://try.gitea.io/xingshijun/lfzl.git",
+      "original_url": "",
+      "website": "",
+      "stars_count": 0,
+      "forks_count": 0,
+      "watchers_count": 1,
+      "open_issues_count": 0,
+      "open_pr_counter": 0,
+      "release_counter": 0,
+      "default_branch": "master",
+      "archived": false,
+      "created_at": "2018-04-02T08:34:08Z",
+      "updated_at": "2019-11-21T10:23:36Z",
+      "permissions": {
+        "admin": false,
+        "push": false,
+        "pull": true
+      },
+      "has_issues": true,
+      "internal_tracker": {
+        "enable_time_tracker": true,
+        "allow_only_contributors_to_track_time": true,
+        "enable_issue_dependencies": true
+      },
+      "has_wiki": true,
+      "has_pull_requests": true,
+      "ignore_whitespace_conflicts": false,
+      "allow_merge_commits": false,
+      "allow_rebase": false,
+      "allow_rebase_explicit": true,
+      "allow_squash_merge": false,
+      "avatar_url": ""
+    }
+  ]
+}
\ No newline at end of file
diff --git a/swh/lister/gitea/tests/test_lister.py b/swh/lister/gitea/tests/test_lister.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/tests/test_lister.py
@@ -0,0 +1,60 @@
+# 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 logging
+import re
+import unittest
+
+from swh.lister.core.tests.test_lister import HttpListerTesterBase
+from swh.lister.gitea.lister import GiteaLister
+
+logger = logging.getLogger(__name__)
+
+
+class GiteaListerTester(HttpListerTesterBase, unittest.TestCase):
+    Lister = GiteaLister
+    test_re = re.compile(r"^.*/projects.*page=(\d+).*")
+    lister_subdir = "gitea"
+    good_api_response_file = "data/https_try.gitea.io/api_response.json"
+    bad_api_response_file = "data/https_try.gitea.io/api_empty_response.json"
+    first_index = 1
+    last_index = 2
+    entries_per_page = 3
+    convert_type = int
+
+    def response_headers(self, request):
+        headers = {}
+        if self.request_index(request) == self.first_index:
+            headers.update(
+                {
+                    "Link": "<https://try.gitea.io/api/v1\
+                        /repos/search?&page=%s&sort=id>;"
+                    ' rel="next"' % self.last_index
+                }
+            )
+
+        return headers
+
+
+def test_lister_gitea(swh_listers, requests_mock_datadir):
+    lister: GiteaLister = swh_listers["gitea"]
+
+    lister.run()
+    r = lister.scheduler.search_tasks(task_type="load-git")
+    assert len(r) == 3
+
+    for row in r:
+        assert row["type"] == "load-git"
+        # arguments check
+        args = row["arguments"]["args"]
+        assert len(args) == 0
+
+        # kwargs
+        kwargs = row["arguments"]["kwargs"]
+        url = kwargs["url"]
+        assert url.startswith("https://try.gitea.io")
+
+        assert row["policy"] == "recurring"
+        assert row["priority"] is None
diff --git a/swh/lister/gitea/tests/test_tasks.py b/swh/lister/gitea/tests/test_tasks.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/tests/test_tasks.py
@@ -0,0 +1,141 @@
+from time import sleep
+from celery.result import GroupResult
+
+from unittest.mock import patch
+
+
+def test_ping(swh_app, celery_session_worker):
+    res = swh_app.send_task("swh.lister.gitea.tasks.ping")
+    assert res
+    res.wait()
+    assert res.successful()
+    assert res.result == "OK"
+
+
+@patch("swh.lister.gitea.tasks.GiteaLister")
+def test_incremental(lister, swh_app, celery_session_worker):
+    # setup the mocked GiteaLister
+    lister.return_value = lister
+    lister.run.return_value = None
+    lister.get_pages_information.return_value = (None, 10, None)
+
+    res = swh_app.send_task("swh.lister.gitea.tasks.IncrementalGiteaLister")
+    assert res
+    res.wait()
+    assert res.successful()
+
+    lister.assert_called_once_with(sort="desc")
+    lister.db_last_index.assert_not_called()
+    lister.get_pages_information.assert_called_once_with()
+    lister.run.assert_called_once_with(min_bound=1, max_bound=10, check_existence=True)
+
+
+@patch("swh.lister.gitea.tasks.GiteaLister")
+def test_range(lister, swh_app, celery_session_worker):
+    # setup the mocked GiteaLister
+    lister.return_value = lister
+    lister.run.return_value = None
+
+    res = swh_app.send_task(
+        "swh.lister.gitea.tasks.RangeGiteaLister", kwargs=dict(start=12, end=42)
+    )
+    assert res
+    res.wait()
+    assert res.successful()
+
+    lister.assert_called_once_with()
+    lister.db_last_index.assert_not_called()
+    lister.run.assert_called_once_with(min_bound=12, max_bound=42)
+
+
+@patch("swh.lister.gitea.tasks.GiteaLister")
+def test_relister(lister, swh_app, celery_session_worker):
+    # setup the mocked GiteaLister
+    lister.return_value = lister
+    lister.run.return_value = None
+    lister.get_pages_information.return_value = (None, 85, None)
+    lister.db_partition_indices.return_value = [
+        (i, i + 9) for i in range(0, 80, 10)
+    ] + [(80, 85)]
+
+    res = swh_app.send_task("swh.lister.gitea.tasks.FullGiteaRelister")
+    assert res
+
+    res.wait()
+    assert res.successful()
+
+    # retrieve the GroupResult for this task and wait for all the subtasks
+    # to complete
+    promise_id = res.result
+    assert promise_id
+    promise = GroupResult.restore(promise_id, app=swh_app)
+    for i in range(5):
+        if promise.ready():
+            break
+        sleep(1)
+
+    lister.assert_called_with()
+
+    # one by the FullGiteaRelister task
+    # + 9 for the RangeGiteaLister subtasks
+    assert lister.call_count == 10
+
+    lister.db_last_index.assert_not_called()
+    lister.db_partition_indices.assert_not_called()
+    lister.get_pages_information.assert_called_once_with()
+
+    # lister.run should have been called once per partition interval
+    for i in range(8):
+        # XXX inconsistent behavior: max_bound is EXCLUDED here
+        assert (
+            dict(min_bound=10 * i, max_bound=10 * i + 10),
+        ) in lister.run.call_args_list
+    assert (dict(min_bound=80, max_bound=85),) in lister.run.call_args_list
+
+
+@patch("swh.lister.gitea.tasks.GiteaLister")
+def test_relister_instance(lister, swh_app, celery_session_worker):
+    # setup the mocked GiteaLister
+    lister.return_value = lister
+    lister.run.return_value = None
+    lister.get_pages_information.return_value = (None, 85, None)
+    lister.db_partition_indices.return_value = [
+        (i, i + 9) for i in range(0, 80, 10)
+    ] + [(80, 85)]
+
+    res = swh_app.send_task(
+        "swh.lister.gitea.tasks.FullGiteaRelister",
+        kwargs=dict(url="https://0xacab.org/api/v4"),
+    )
+    assert res
+
+    res.wait()
+    assert res.successful()
+
+    # retrieve the GroupResult for this task and wait for all the subtasks
+    # to complete
+    promise_id = res.result
+    assert promise_id
+    promise = GroupResult.restore(promise_id, app=swh_app)
+    for i in range(5):
+        if promise.ready():
+            break
+        sleep(1)
+
+    lister.assert_called_with(url="https://0xacab.org/api/v4")
+
+    # one by the FullGiteaRelister task
+    # + 9 for the RangeGiteaLister subtasks
+    assert lister.call_count == 10
+
+    lister.db_last_index.assert_not_called()
+    lister.db_partition_indices.assert_not_called()
+    lister.get_pages_information.assert_called_once_with()
+
+    # lister.run should have been called once per partition interval
+    for i in range(8):
+        # XXX inconsistent behavior: max_bound is EXCLUDED here
+        assert (
+            dict(min_bound=10 * i, max_bound=10 * i + 10),
+        ) in lister.run.call_args_list
+    assert (dict(min_bound=80, max_bound=85),) in lister.run.call_args_list