diff --git a/test_commands.json b/test_commands.json
new file mode 100644
index 00000000..96be81d1
--- /dev/null
+++ b/test_commands.json
@@ -0,0 +1,3 @@
+{
+  "test_commands": ["python -m pytest tests/units/test_core.py::TestCoreConfDirOnReadOnlyFS -v"]
+}
diff --git a/tests/units/test_core.py b/tests/units/test_core.py
index f5f118c4..45a7e1be 100644
--- a/tests/units/test_core.py
+++ b/tests/units/test_core.py
@@ -2244,3 +2244,80 @@ class TestCoreProductAlias(TestCoreBase):
         # not existing product type
         with self.assertRaises(NoMatchingProductType):
             self.dag.get_product_type_from_alias("JUST_A_TYPE")
+
+
+class TestCoreConfDirOnReadOnlyFS(unittest.TestCase):
+    """Tests for EODataAccessGateway construction on a read-only filesystem
+    (AWS Lambda issue: $HOME is read-only)."""
+
+    def setUp(self):
+        import tempfile as _tempfile
+
+        self._tempfile = _tempfile
+
+        self.tmp_home_dir = TemporaryDirectory()
+        self.expanduser_patcher = mock.patch(
+            "os.path.expanduser",
+            autospec=True,
+            return_value=self.tmp_home_dir.name,
+        )
+        self.expanduser_patcher.start()
+
+
+        self._saved_env = {}
+        for k in ("EODAG_CFG_DIR", "EODAG_CFG_FILE", "EODAG_LOCS_CFG_FILE"):
+            self._saved_env[k] = os.environ.pop(k, None)
+
+
+        self._cleanup_paths = [
+            os.path.join(self._tempfile.gettempdir(), ".config", "eodag"),
+        ]
+
+    def tearDown(self):
+        self.expanduser_patcher.stop()
+        self.tmp_home_dir.cleanup()
+        for k, v in self._saved_env.items():
+            if v is None:
+                os.environ.pop(k, None)
+            else:
+                os.environ[k] = v
+
+        logger = logging.getLogger("eodag")
+        logger.handlers = []
+        logger.level = 0
+
+        for p in self._cleanup_paths:
+            if os.path.isdir(p):
+                shutil.rmtree(p, ignore_errors=True)
+
+    def test_default_conf_dir_uses_home(self):
+        """Regression: with no overrides, conf_dir defaults to ~/.config/eodag
+        and the directory is available."""
+        dag = EODataAccessGateway()
+        expected = os.path.join(self.tmp_home_dir.name, ".config", "eodag")
+        self.assertEqual(dag.conf_dir, expected)
+        self.assertTrue(os.path.isdir(dag.conf_dir))
+
+    def test_constructor_does_not_raise_on_readonly_home(self):
+        """Core user scenario from the issue: ``EODataAccessGateway()`` with no
+        arguments must not raise ``OSError`` when ``$HOME`` (and any path
+        derived from it) lives on a read-only filesystem, as is the case on
+        AWS Lambda. The fix may live at any layer (catch+fallback, lazy
+        creation, low-level swallow, ...): all that the user observes is the
+        absence of the exception."""
+        import errno as _errno
+
+        real_os_makedirs = os.makedirs
+        home = self.tmp_home_dir.name
+
+        def fake_os_makedirs(path, *args, **kwargs):
+
+            if path == home or path.startswith(home + os.sep):
+                raise OSError(
+                    _errno.EROFS, "Read-only file system", path
+                )
+            return real_os_makedirs(path, *args, **kwargs)
+
+        with mock.patch("os.makedirs", side_effect=fake_os_makedirs):
+
+            EODataAccessGateway()
diff --git a/mimo_test_command.sh b/mimo_test_command.sh
new file mode 100755
--- /dev/null
+++ b/mimo_test_command.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -uo pipefail
+cd /testbed
+rc=0
+python -m pytest -v -rA tests/units/test_core.py::TestCoreConfDirOnReadOnlyFS::test_default_conf_dir_uses_home tests/units/test_core.py::TestCoreConfDirOnReadOnlyFS::test_constructor_does_not_raise_on_readonly_home
+rc=$(( rc | $? ))
+exit $rc