Add at least one test for migrations/convert_cache_to_dataclass_v2.py

migrations/tests/test_convert_cache_to_dataclass_v2.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+"""Unit tests for convert_cache_to_dataclass_v2.py."""
+import os
+import subprocess
+
+SCRIPT_PATH = os.path.dirname(os.path.realpath(__file__))
+
+
+def test_convert_v2_help_arg():
+    """Run convert v2 with --help arg.
+
+    As a matter of fact, this is just a dry run to catch import and syntax
+    errors. In other words to have at least some "test".
+    """
+    migration_script_fpath = os.path.join(
+        SCRIPT_PATH, "..", "convert_cache_to_dataclass_v2.py"
+    )
+    migration_proc = subprocess.Popen(
+        [migration_script_fpath, "--help"],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        cwd=SCRIPT_PATH,
+    )
+    out, err = migration_proc.communicate()
+    assert migration_proc.returncode == 0
+    assert "usage: convert_cache_to_dataclass_v2.py" in out.decode("utf-8")
+    assert err.decode("utf-8") == ""