Test to verify/document behavior of mapping over multi-selects.

lib/galaxy_test/workflow/multi_select_mapping.gxwf-tests.yml

@@ -0,0 +1,27 @@
+- doc: |
+    Test to verify that mapping a list of a multi-select parameter maps over the job.
+    Ideally there would be a way to specify that the list should be reduced into the
+    parameter. It might work to have an expression tool to combine the list into a
+    string.
+  job:
+    input:
+      type: collection
+      collection_type: list
+      elements:
+        - identifier: the_example_2
+          content: '"ex2"'
+          ext: 'expression.json'
+        - identifier: the_example_5
+          content: '"ex5"'
+          ext: 'expression.json'
+  outputs:
+    output:
+      elements:
+        the_example_2:
+          asserts:
+          - that: has_text
+            text: 'ex2'
+        the_example_5:
+          asserts:
+          - that: has_text
+            text: 'ex5'

lib/galaxy_test/workflow/multi_select_mapping.gxwf.yml

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+class: GalaxyWorkflow
+inputs:
+  input:
+    type: collection
+    collection_type: list
+outputs:
+  output:
+    outputSource: map_over_multi_select/output2
+steps:
+  map_over_multi_select:
+    tool_id: multi_select
+    in:
+      select_ex: input
+      select_optional: input