add test for filters in statically defined collection elements

test/functional/tools/collection_creates_pair_filter.xml

@@ -0,0 +1,59 @@
+<tool id="collection_creates_pair_filter" name="collection_creates_pair_filter" version="0.1.0">
+  <description>test if filters in statically defined collection elements work</description>
+  <command>
+    for i in A B C D; do
+      echo "\$i" > "\$i".txt;
+    done
+  </command>
+  <inputs>
+    <param name="decide" type="boolean"/>
+  </inputs>
+  <outputs>
+    <collection name="paired_output" format="txt" type="paired" label="Split Pair">
+      <data name="forward" from_work_dir="A.txt">
+        <filter>decide</filter>
+      </data>
+      <data name="reverse" from_work_dir="B.txt">
+        <filter>decide</filter>
+      </data>
+      <data name="forward" from_work_dir="C.txt">
+        <filter>not decide</filter>
+      </data>
+      <data name="reverse" from_work_dir="D.txt">
+        <filter>not decide</filter>
+      </data>
+    </collection>
+  </outputs>
+  <tests>
+    <test expect_num_outputs="3">
+      <param name="decide" value="true" />
+      <output_collection name="paired_output" type="paired">
+        <element name="forward" ftype="txt">
+          <assert_contents>
+            <has_line line="A" />
+          </assert_contents>
+        </element>
+        <element name="reverse" ftype="txt">
+          <assert_contents>
+            <has_line line="B" />
+          </assert_contents>
+        </element>
+      </output_collection>
+    </test>
+    <test expect_num_outputs="3">
+      <param name="decide" value="false" />
+      <output_collection name="paired_output" type="paired">
+        <element name="forward" ftype="txt">
+          <assert_contents>
+            <has_line line="C" />
+          </assert_contents>
+        </element>
+        <element name="reverse" ftype="txt">
+          <assert_contents>
+            <has_line line="D" />
+          </assert_contents>
+        </element>
+      </output_collection>
+    </test>
+  </tests>
+</tool>

test/functional/tools/sample_tool_conf.xml

@@ -189,6 +189,7 @@
   <tool file="collection_mixed_param.xml" />
   <tool file="collection_two_paired.xml" />
   <tool file="collection_creates_pair.xml" />
+  <tool file="collection_creates_pair_filter.xml" />
   <tool file="collection_creates_pair_format.xml" />
   <tool file="collection_creates_pair_from_type.xml" />
   <tool file="collection_creates_pair_from_work_dir.xml" />