--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/planemo/lib/python3.7/site-packages/cwltool/tests/test_empty_input.py	Fri Jul 31 00:18:57 2020 -0400
@@ -0,0 +1,20 @@
+try:
+    from cStringIO import StringIO
+except ImportError:
+    from io import StringIO
+
+from cwltool.main import main
+from .util import get_data, temp_dir, windows_needs_docker
+
+@windows_needs_docker
+def test_empty_input():
+    empty_json = '{}'
+    empty_input = StringIO(empty_json)
+
+    with temp_dir() as tmpdir:
+        params = ['--outdir', tmpdir, get_data('tests/wf/no-parameters-echo.cwl'), '-']
+
+        try:
+            assert main(params, stdin=empty_input) == 0
+        except SystemExit as err:
+            assert err.code == 0