add qa test

tests/test_qa.py

@@ -0,0 +1,27 @@
+import subprocess
+import os
+import tempfile
+import pytest
+
+
+TEST_DATA = os.path.join("data", "test")
+
+FONT = os.path.join(TEST_DATA, "MavenPro[wght].ttf")
+
+
+@pytest.mark.parametrize(
+    "cmd,fps",
+    [
+        (
+            ["--interpolations"],
+            [
+                os.path.join("Interpolations", "MavenPro[wght].pdf")
+            ]
+        ),
+    ]
+)
+def test_qa(cmd, fps):
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        subprocess.run(["gftools", "qa", "-f", FONT] + cmd + ["-o", tmp_dir])
+        for fp in fps:
+            assert os.path.exists(os.path.join(tmp_dir, fp)), f"'{fp}' is missing"