diff --git a/scopesim/tests/test_import_all.py b/scopesim/tests/test_import_all.py
new file mode 100644
index 00000000..7d046736
--- /dev/null
+++ b/scopesim/tests/test_import_all.py
@@ -0,0 +1,17 @@
+"""Test whether all Python files can be imported."""
+import importlib.util
+from pathlib import Path
+
+import scopesim
+
+
+def test_import_all():
+    """Test whether all Python files can be imported.
+
+    This ensures that all files are included in the code coverage.
+    """
+    path_scopesim = Path(scopesim.__file__).parent
+    paths_modules = path_scopesim.glob("**/*.py")
+    for pm in paths_modules:
+        spec = importlib.util.spec_from_file_location("module.name", pm)
+        _ = importlib.util.module_from_spec(spec)