loops: add validation test

Author: mr-c

tests/test_loop.py

@@ -0,0 +1,23 @@
+"""Test the prototype loop extension."""
+
+from cwltool.main import main
+from .util import get_data
+
+
+def test_validate_loop() -> None:
+    """Affirm that the sample loop workflow validates with --enable-ext."""
+    params = [
+        "--enable-ext",
+        "--validate",
+        get_data("tests/loop.cwl"),
+    ]
+    assert main(params) == 0
+
+
+def test_validate_loop_fail_no_ext() -> None:
+    """Affirm that the sample loop workflow does not validate when --enable-ext is missing."""
+    params = [
+        "--validate",
+        get_data("tests/loop.cwl"),
+    ]
+    assert main(params) == 1