diff --git a/autocoord/tests/__init__.py b/autocoord/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/autocoord/tests/test_gemmineer.py b/autocoord/tests/test_gemmineer.py
new file mode 100644
index 0000000..b241655
--- /dev/null
+++ b/autocoord/tests/test_gemmineer.py
@@ -0,0 +1,9 @@
+import autocoord.gemmineer as gemmineer
+
+
+def test_number_of_known():
+    assert len(gemmineer._known_protein_residues) == 22
+
+
+def test_unk_is_known():
+    assert "UNK" in gemmineer._known_protein_residues