modify test2D to automate file creation

cwltool/command_line_tool.py

@@ -1497,14 +1497,16 @@ def collect_output(
                 else:
 
                     def recursively_insert(j_dict: Any, key: Any, val: Any) -> Any:
-                        """Recursively inserts a value into any dictionaries"""
+                        """Recursively insert a value into any dictionary."""
                         if isinstance(j_dict, List):
                             return [recursively_insert(x, key, val) for x in j_dict]
                         if isinstance(j_dict, Dict):
                             if j_dict.get("class") == "File":
                                 j_dict[key] = val
                             else:
-                                return {x: recursively_insert(y, key, val) for x, y in j_dict.items()}
+                                return {
+                                    x: recursively_insert(y, key, val) for x, y in j_dict.items()
+                                }
                         return j_dict
 
                     result = recursively_insert(result, "format", format_field)

tests/test_2D.py

@@ -1,16 +1,20 @@
 import subprocess
 import sys
+from pathlib import Path
 
 from .util import get_data
 
 
 def test_output_2D_file_format() -> None:
-    """Test format tag for 2D output arrays."""
+    """A simple test for format tag fix for 2D output arrays."""
 
+    Path("filename.txt").touch()
     params = [
         sys.executable,
         "-m",
         "cwltool",
+        "--cachedir",  # just so that the relative path of file works out
+        "foo",
         get_data("tests/output_2D_file_format.cwl"),
     ]