add test for correct sorting on recursive discovery

<!--essentially the same as multi_output_recurse_collection, but:

  - test collection and generated order in the collection

-->

<tool id="multi_output_recurse_collection" name="multi_output_recurse_collection" version="0.1.0" profile="22.01">

  <macros>

    <xml name="outelem" tokens="number" token_path="">

      <element name="@PATH@@NUMBER@" ftype="txt">

        <assert_contents>

          <has_text text="@NUMBER@"/>

        </assert_contents>

      </element>

    </xml>

  </macros>

  <command><![CDATA[

    mkdir 1;

    echo "3" > 1/3.txt;

    echo "4" > 1/4.txt;

    mkdir 2;

    echo "1" > 2/1.txt;

    echo "2" > 2/2.txt;

    mkdir 3;

    echo "5" > 3/5.txt;

    mkdir 3/1;

    echo "0" > 3/1/0.txt;

    ]]></command>

  <inputs>

    <param type="boolean" name="match_relative"/>

  </inputs>

  <outputs>

    <collection type="list" name="output">

      <discover_datasets directory="./" recurse="true" pattern="__designation_and_ext__"/>

    </collection>

    <collection type="list" name="output_relative">

      <discover_datasets directory="./" recurse="true" pattern="__designation_and_ext__" match_relative_path="true"/>

    </collection>

  </outputs>

  <tests>

    <test>

      <output_collection name="output" count="6">

        <expand macro="outelem" number="0"/>

        <expand macro="outelem" number="1"/>

        <expand macro="outelem" number="2"/>

        <expand macro="outelem" number="3"/>

        <expand macro="outelem" number="4"/>

        <expand macro="outelem" number="5"/>

      </output_collection>

      <output_collection name="output_relative" count="6">

        <expand macro="outelem" path="1/" number="3"/>

        <expand macro="outelem" path="1/" number="4"/>

        <expand macro="outelem" path="2/" number="1"/>

        <expand macro="outelem" path="2/" number="2"/>

        <expand macro="outelem" path="3/" number="5"/>

        <expand macro="outelem" path="3/1/" number="0"/>

      </output_collection>

    </test>

  </tests>

</tool>

  <tool file="multi_output_assign_primary.xml" />

  <tool file="multi_output_assign_primary_ext_dbkey.xml" />

  <tool file="multi_output_recurse.xml" />

  <tool file="multi_output_recurse_collection.xml" />

  <tool file="tool_provided_metadata_1.xml" />

  <tool file="tool_provided_metadata_2.xml" />

  <tool file="tool_provided_metadata_3.xml" />