Change an example in Section 12 not to use side-effect

_episodes/12-env.md

@@ -35,11 +35,23 @@ command line:
 
 ~~~
 $ cwl-runner env.cwl echo-job.yml
-[job 140710387785808] /home/example$ env
-PATH=/bin:/usr/bin:/usr/local/bin
+[job env.cwl] /home/example$ env > /home/example/output.txt
+[job env.cwl] completed success
+{
+    "example_out": {
+        "location": "file:///home/example/output.txt",
+        "basename": "output.txt",
+        "class": "File",
+        "checksum": "sha1$1ca16a840b14807b2fd3323022c476b06a150e2f",
+        "size": 94,
+        "path": "/home/example/output.txt"
+    }
+}
+Final process status is success
+$ cat output.txt
 HELLO=Hello world!
+PATH=/bin:/usr/bin:/usr/local/bin
+HOME=/home/example
 TMPDIR=/tmp/tmp63Obpk
-Final process status is success
-{}
 ~~~
 {: .output}

_includes/cwl/12-env/env.cwl

@@ -9,4 +9,7 @@ requirements:
       HELLO: $(inputs.message)
 inputs:
   message: string
-outputs: []
+outputs:
+  example_out:
+    type: stdout
+stdout: output.txt

_includes/cwl/conformance-test.yml

@@ -129,7 +129,16 @@
       location: Any
       size: 22
 
-# Section 12 depends on side-effects
+# Section 12
+- doc: Test for section 12
+  job: 12-env/echo-job.yml
+  tool: 12-env/env.cwl
+  output:
+    example_out:
+      class: File
+      basename: output.txt
+      location: Any
+
 # Section 13 depends on side-effects
 # Section 14 depends on side-effects