Add test for ShellCommandRequirement

Author: Peter Amstutz

draft-3/draft-3/revsort-job.json

@@ -0,0 +1,6 @@
+{
+  "input": {
+    "class": "File",
+    "path": "whale.txt"
+  }
+}

draft-3/draft-3/revsort-job.json

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+class: CommandLineTool
+description: "Reverse each line using the `rev` command then sort."
+requirements:
+  - class: ShellCommandRequirement
+inputs:
+  - id: "#input"
+    type: File
+outputs:
+  - id: "#output"
+    type: File
+    outputBinding:
+      glob: output.txt
+
+baseCommand: []
+arguments:
+  - rev
+  - valueFrom:
+      engine: cwl:JsonPointer
+      script: /job/input
+  - valueFrom: " | "
+    shellQuote: false
+  - sort
+  - valueFrom: "> output.txt"
+    shellQuote: false

draft-3/draft-3/shelltest.cwl

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+Call me Ishmael. Some years ago--never mind how long precisely--having
+little or no money in my purse, and nothing particular to interest me on
+shore, I thought I would sail about a little and see the watery part of
+the world. It is a way I have of driving off the spleen and regulating
+the circulation. Whenever I find myself growing grim about the mouth;
+whenever it is a damp, drizzly November in my soul; whenever I find
+myself involuntarily pausing before coffin warehouses, and bringing up
+the rear of every funeral I meet; and especially whenever my hypos get
+such an upper hand of me, that it requires a strong moral principle to
+prevent me from deliberately stepping into the street, and methodically
+knocking people's hats off--then, I account it high time to get to sea
+as soon as I can. This is my substitute for pistol and ball. With a
+philosophical flourish Cato throws himself upon his sword; I quietly
+take to the ship. There is nothing surprising in this. If they but knew
+it, almost all men in their degree, some time or other, cherish very
+nearly the same feelings towards the ocean with me.