Add a test for log output

Author: RZ9082

tools/porechop/porechop.xml

@@ -101,32 +101,41 @@ porechop
         </data>
     </outputs>
     <tests>
-        <test>
+        <test expect_num_outputs="2">
             <param name="input_file" ftype="fasta" value="test_format.fasta"/>
             <param name="format" value="fasta"/>
+            <param name="log_file" value="true"/>
             <output name="outfile" ftype="fasta" file="out.fasta"/>
+            <output name="log_output" ftype="txt">
+                <assert_contents>
+                    <has_line line="  PCR adapters 2                            66.7       63.6"/>
+                    <has_line line="  Barcode 1 (reverse)                       59.4       66.7"/>
+                    <has_line line="4 / 9 reads had adapters trimmed from their start (74 bp removed)"/>
+                    <has_line line="3 / 9 reads had adapters trimmed from their end (49 bp removed)"/>
+                </assert_contents>
+            </output>
         </test>
-        <test>
+        <test expect_num_outputs="1">
             <param name="input_file" ftype="fastqsanger.gz" value="test_format.fastq.gz"/>
             <param name="format" value="fastq"/>
             <output name="outfile" ftype="fastqsanger" file="out.fastq"/>
         </test>
-        <test>
+        <test expect_num_outputs="1">
             <param name="input_file" ftype="fastq.gz" value="test_format.fastq.gz"/>
             <param name="format" value="fastq"/>
             <output name="outfile" ftype="fastqsanger" file="out.fastq"/>
         </test>
-        <test>
+        <test expect_num_outputs="1">
             <param name="input_file" ftype="fasta" value="test_format.fasta"/>
             <param name="format" value="fasta.gz"/>
             <output name="outfile" ftype="fasta.gz" file="out.fasta.gz" compare="sim_size"/>
         </test>
-        <test>
+        <test expect_num_outputs="1">
             <param name="input_file" ftype="fasta" value="test_format.fasta"/>
             <param name="format" value="fastq.gz"/>
             <output name="outfile" ftype="fastqsanger.gz" file="out.fastq.gz" compare="sim_size"/>
         </test>
-        <test>
+        <test expect_num_outputs="1">
             <param name="input_file" ftype="fasta" value="test_format.fasta"/>
             <param name="format" value="fasta"/>
             <param name="barcode_threshold" value="70"/>