escape the emoji for py2.7+mswin

Author: mr-c

tests/echo-position-expr.cwl

@@ -18,7 +18,7 @@ arguments:
   - position: ${return 2;}
     valueFrom: singular
   - position: ${return null;}
-    valueFrom: 🕺
+    valueFrom: "\U0001F57A"
 outputs:
   out:
     type: string

tests/test_examples.py

@@ -890,7 +890,7 @@ def test_bad_basecommand_docker():
     assert "permanentFail" in stderr, stderr
     assert error_code == 1
 
-@pytest.mark.skipif(onWindows() and six.PY2, reason="emojis not supported with Py2 under Windows")
+#@pytest.mark.skipif(onWindows() and six.PY2, reason="emojis not supported with Py2 under Windows")
 def test_v1_0_position_expression():
     test_file = "tests/echo-position-expr.cwl"
     test_job = "tests/echo-position-expr-job.yml"