add more tests

tools/phyloseq/macros.xml

@@ -12,7 +12,6 @@
             <requirement type="package" version="@TOOL_VERSION@">bioconductor-phyloseq</requirement>
             <requirement type="package" version="1.7.3">r-optparse</requirement>
             <requirement type="package" version="2.0.0">r-tidyverse</requirement>
-            <requirement type="package" version="3.3.0">r-ggplot2</requirement>
         </requirements>
     </xml>
     <xml name="phyloseq_input">

tools/phyloseq/phyloseq_plot_bar.xml

@@ -22,7 +22,8 @@ Rscript '${__tool_directory__}/phyloseq_plot_bar.R'
   <outputs>
     <data name="output" format="pdf" label="Bar Chart (PDF)" />
   </outputs>
-  <tests>
+   <tests>
+    <!-- Test 1: Default parameters -->
     <test>
       <param name="input" value="output.phyloseq" ftype="phyloseq"/>
       <param name="x" value="Property"/>
@@ -35,6 +36,27 @@ Rscript '${__tool_directory__}/phyloseq_plot_bar.R'
         </assert_contents>
       </output>
     </test>
+    <!-- Test 2: Empty parameters (invalid) -->
+    <test>
+      <param name="input" value="output.phyloseq" ftype="phyloseq"/>
+      <param name="x" value=""/>
+      <param name="fill" value=""/>
+      <param name="facet" value=""/>
+      <expect_exit_code>1</expect_exit_code>
+    </test>
+    <!-- Test 3: Different parameter combination -->
+    <test>
+      <param name="input" value="output.phyloseq" ftype="phyloseq"/>
+      <param name="x" value="Number"/>
+      <param name="fill" value="Property"/>
+      <param name="facet" value=""/>
+      <output name="output" ftype="pdf">
+        <assert_contents>
+          <has_text text="%PDF"/>
+          <has_text text="%%EOF"/>
+        </assert_contents>
+      </output>
+    </test>
   </tests>
   <help>
     **Description**