"when" expressions get an empty "self" variable

Author: mr-c

cwltool/workflow_job.py

@@ -692,7 +692,6 @@ def valueFromFunc(
                         None,
                         None,
                         {},
-                        context=cast(Optional[CWLObjectType], v),
                         debug=runtimeContext.debug,
                         js_console=runtimeContext.js_console,
                         timeout=runtimeContext.eval_timeout,

tests/test_conditionals.py

@@ -0,0 +1,18 @@
+"""Tests related to CWL v1.2+ "when" expressions and conditional handling."""
+
+import re
+
+from .util import get_data, get_main_output
+
+
+def test_conditional_step_no_inputs() -> None:
+    """Confirm fix for bug that populated `self` object for `when` expressions."""
+    err_code, _, stderr = get_main_output(
+        [
+            get_data("tests/wf/conditional_step_no_inputs.cwl"),
+        ]
+    )
+    result = json.loads(stdout)["required"]
+    stderr = re.sub(r"\s\s+", " ", stderr)
+    assert err_code == 0, stderr
+    assert result is None

tests/wf/conditional_step_no_inputs.cwl

@@ -0,0 +1,28 @@
+#!/usr/bin/env cwl-runner
+cwlVersion: v1.2
+class: Workflow
+
+requirements:
+ InlineJavascriptRequirement: {}
+
+inputs: []
+
+steps:
+  step1:
+    in: {}
+    when: $(self !== null)
+    run:
+      class: ExpressionTool
+      inputs: []
+      requirements:
+        InlineJavascriptRequirement: {}
+      expression: |
+        $({"result": "huzzah!"})
+      outputs:
+        result: string
+    out: [ result ]
+
+outputs:
+  required:
+    type: string
+    outputSource: step1/result