new: add test for empty input from stdin

Author: psafont

tests/test_empty_input.py

@@ -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

tests/util.py

@@ -7,6 +7,7 @@
 import shutil
 import contextlib
 import tempfile
+import shutil
 from typing import Text
 
 from pkg_resources import (Requirement, ResolutionError,  # type: ignore

tests/wf/no-parameters-echo.cwl

@@ -0,0 +1,12 @@
+#!/usr/bin/env cwl-runner
+cwlVersion: v1.0
+class: CommandLineTool
+doc: "This is a tool that can be launched without parameters"
+baseCommand: [echo]
+inputs:
+  in:
+    type: string
+    default: "foo"
+outputs:
+  e_out:
+    type: stdout