diff --git a/tests/plugins/gaw/test_dms.py b/tests/plugins/gaw/test_dms.py
index 92cf7ae56..8c1a62f39 100644
--- a/tests/plugins/gaw/test_dms.py
+++ b/tests/plugins/gaw/test_dms.py
@@ -12,7 +12,6 @@ def _make_data():
 
 
 @pytest.fixture(scope="module")
-@lustre_unavail
 def data_vmrdms_ams_cvo():
     return _make_data()
 
diff --git a/tests/plugins/icos/test_reader.py b/tests/plugins/icos/test_reader.py
index 438eed239..a129184d4 100644
--- a/tests/plugins/icos/test_reader.py
+++ b/tests/plugins/icos/test_reader.py
@@ -63,7 +63,7 @@ def test_stations(reader: ReadICOS, station: str):
 
 
 def test_PROVIDES_VARIABLES(reader: ReadICOS):
-    return set(reader.PROVIDES_VARIABLES) >= VARS_PROVIDED
+    assert set(reader.PROVIDES_VARIABLES) >= VARS_PROVIDED
 
 
 @station_names
diff --git a/tests/plugins/ipcforests/test_reader.py b/tests/plugins/ipcforests/test_reader.py
index 8fb680b8f..00169fe39 100644
--- a/tests/plugins/ipcforests/test_reader.py
+++ b/tests/plugins/ipcforests/test_reader.py
@@ -51,7 +51,7 @@ def test_METADATA(meta_reader: ReadIPCForestMeta):
 
 
 def test_PROVIDES_VARIABLES(reader: ReadIPCForest):
-    return set(reader.PROVIDES_VARIABLES) >= VARS_PROVIDED
+    assert set(reader.PROVIDES_VARIABLES) >= VARS_PROVIDED
 
 
 def test_read_file(
diff --git a/tests/plugins/mep/test_reader.py b/tests/plugins/mep/test_reader.py
index 149000125..d997e969b 100644
--- a/tests/plugins/mep/test_reader.py
+++ b/tests/plugins/mep/test_reader.py
@@ -63,7 +63,7 @@ def test_stations(reader: ReadMEP, station: str):
 
 @lustre_unavail
 def test_PROVIDES_VARIABLES(reader: ReadMEP):
-    return set(reader.PROVIDES_VARIABLES) >= VARS_PROVIDED
+    assert set(reader.PROVIDES_VARIABLES) >= VARS_PROVIDED
 
 
 @lustre_unavail