diff --git a/swh/core/pytest_plugin.py b/swh/core/pytest_plugin.py
--- a/swh/core/pytest_plugin.py
+++ b/swh/core/pytest_plugin.py
@@ -16,6 +16,7 @@
 from requests.adapters import BaseAdapter
 from requests.structures import CaseInsensitiveDict
 from requests.utils import get_encoding_from_headers
+import sentry_sdk
 
 logger = logging.getLogger(__name__)
 
@@ -367,3 +368,40 @@
     statsd = Statsd()
     statsd._socket = FakeSocket()
     yield statsd
+
+
+@pytest.fixture
+def monkeypatch_sentry_transport():
+    # Inspired by
+    # https://github.com/getsentry/sentry-python/blob/1.5.9/tests/conftest.py#L168-L184
+
+    initialized = False
+
+    def setup_sentry_transport_monkeypatch(*a, **kw):
+        nonlocal initialized
+        assert not initialized, "already initialized"
+        initialized = True
+        hub = sentry_sdk.Hub.current
+        client = sentry_sdk.Client(*a, **kw)
+        hub.bind_client(client)
+        client.transport = TestTransport()
+
+    class TestTransport:
+        def __init__(self):
+            self.events = []
+            self.envelopes = []
+
+        def capture_event(self, event):
+            self.events.append(event)
+
+        def capture_envelope(self, envelope):
+            self.envelopes.append(envelope)
+
+    with sentry_sdk.Hub(None):
+        yield setup_sentry_transport_monkeypatch
+
+
+@pytest.fixture
+def sentry_events(monkeypatch_sentry_transport):
+    monkeypatch_sentry_transport()
+    return sentry_sdk.Hub.current.client.transport.events
diff --git a/swh/core/tests/test_sentry.py b/swh/core/tests/test_sentry.py
--- a/swh/core/tests/test_sentry.py
+++ b/swh/core/tests/test_sentry.py
@@ -6,7 +6,7 @@
 import logging
 
 import pytest
-from sentry_sdk import capture_message
+from sentry_sdk import capture_exception, capture_message, set_tag
 
 from swh.core.sentry import init_sentry, override_with_bool_envvar
 
@@ -101,3 +101,35 @@
     logging.error("Stupid error")
 
     assert len(reports) == 2
+
+
+def test_sentry_events_fixture_capture_message(sentry_events):
+    message = "Something went wrong"
+    capture_message(message)
+    assert sentry_events
+    assert "message" in sentry_events[0]
+    assert sentry_events[0]["message"] == message
+
+
+def test_sentry_events_fixture_capture_exception(sentry_events):
+    message = "Invalid value"
+    exception = ValueError(message)
+    capture_exception(exception)
+    assert sentry_events
+    assert "exception" in sentry_events[0]
+    assert "values" in sentry_events[0]["exception"]
+    exception_data = sentry_events[0]["exception"]["values"]
+    assert exception_data
+    assert exception_data[0].get("type") == type(exception).__name__
+    assert exception_data[0].get("value") == message
+
+
+def test_sentry_events_fixture_set_tag(sentry_events):
+    tag_name = "swh.test"
+    tag_value = "test"
+    set_tag(tag_name, tag_value)
+    message = "Something went wrong"
+    capture_message(message)
+    assert sentry_events
+    assert "tags" in sentry_events[0]
+    sentry_events[0]["tags"] == {tag_name: tag_value}