Added test on valueFrom by concatenating two inputs

conformance_tests.yaml

@@ -909,6 +909,13 @@
   doc: Test valueFrom on workflow step referencing other inputs
   tags: [ step_input, inline_javascript, workflow ]
 
+- job: tests/step-valuefrom-job.json
+  output: {val: "a_1.b_2\n"}
+  tool: tests/step-valuefrom6-wf.cwl
+  id: valuefrom_wf_step_concat
+  doc: Test valueFrom on workflow step by concatenating different inputs.
+  tags: [ step_input, inline_javascript, workflow ]
+
 - job: tests/record-output-job.json
   output:
     "orec": {

tests/step-valuefrom6-wf.cwl

@@ -0,0 +1,41 @@
+#!/usr/bin/env cwl-runner
+class: Workflow
+cwlVersion: v1.3.0-dev1
+requirements:
+  - class: StepInputExpressionRequirement
+  - class: InlineJavascriptRequirement
+
+inputs:
+  a: int
+  b: int
+
+outputs:
+  val:
+    type: string
+    outputSource: step1/echo_out
+
+steps:
+  step1:
+    run:
+      id: echo
+      class: CommandLineTool
+      inputs:
+        c:
+          type: string
+          inputBinding: {}
+      outputs:
+        echo_out:
+          type: string
+          outputBinding:
+            glob: "step1_out"
+            loadContents: true
+            outputEval: $(self[0].contents)
+      baseCommand: "echo"
+      stdout: step1_out
+
+    in:
+      a: a
+      b: b
+      c:
+        valueFrom: "a_$(inputs.a).b_$(inputs.b)"
+    out: [echo_out]