Issue #12430: Resolve Pitest suppression for SeparatorWrapCheck

.ci/pitest-suppressions/pitest-whitespace-suppressions.xml

@@ -81,15 +81,6 @@
     <lineContent>processLeft(ast.findFirstToken(TokenTypes.LPAREN));</lineContent>
   </mutation>
 
-  <mutation unstable="false">
-    <sourceFile>SeparatorWrapCheck.java</sourceFile>
-    <mutatedClass>com.puppycrawl.tools.checkstyle.checks.whitespace.SeparatorWrapCheck</mutatedClass>
-    <mutatedMethod>visitToken</mutatedMethod>
-    <mutator>org.pitest.mutationtest.engine.gregor.mutators.experimental.ArgumentPropagationMutator</mutator>
-    <description>replaced call to com/puppycrawl/tools/checkstyle/utils/CodePointUtil::trim with argument</description>
-    <lineContent>final int[] substringAfterToken = CodePointUtil.trim(</lineContent>
-  </mutation>
-
   <mutation unstable="false">
     <sourceFile>SingleSpaceSeparatorCheck.java</sourceFile>
     <mutatedClass>com.puppycrawl.tools.checkstyle.checks.whitespace.SingleSpaceSeparatorCheck</mutatedClass>

config/checkstyle_resources_suppressions.xml

@@ -84,6 +84,10 @@
     files="[\\/]InputRegexpTrailingComment10\.java"/>
   <suppress id="noTrailingWhitespace"
     files="[\\/]InputRegexpSinglelineJavaTrailingComment10\.java"/>
+
+  <!-- Input file contains trailing whitespace to kill pitest mutation -->
+  <suppress id="noTrailingWhitespace" 
+    files="separatorwrap[\\/]InputSeparatorWrapForTestTrailingWhitespace\.java"/>
 
   <!-- intentional problem for testing -->
   <suppress checks="FileTabCharacter"

src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/SeparatorWrapCheckTest.java

@@ -139,4 +139,14 @@ public void testTrimOptionProperty() throws Exception {
         verifyWithInlineConfigParser(
                 getPath("InputSeparatorWrapSetOptionTrim.java"), expected);
     }
+
+    @Test
+    public void testCommaOnNewLine() throws Exception {
+        final String[] expected = {
+            "16:10: " + getCheckMessage(MSG_LINE_NEW, ","),
+            "21:26: " + getCheckMessage(MSG_LINE_NEW, ","),
+        };
+        verifyWithInlineConfigParser(
+                getPath("InputSeparatorWrapForTestTrailingWhitespace.java"), expected);
+    }
 }

src/test/resources/com/puppycrawl/tools/checkstyle/checks/whitespace/separatorwrap/InputSeparatorWrapForTestTrailingWhitespace.java

@@ -0,0 +1,30 @@
+/*
+SeparatorWrap
+tokens = COMMA
+option = nl
+
+*/
+
+package com.puppycrawl.tools.checkstyle.checks.whitespace.separatorwrap;
+
+public class InputSeparatorWrapForTestTrailingWhitespace {
+
+    String s;
+
+    // Trailing whitespace after ',' in variable declaration
+    // violation below '',' should be on a new line.'
+    int a,  
+            b;
+
+    // Trailing whitespace after ',' in function arguments
+    // violation below '',' should be on a new line.'
+    public void foo(int a,  
+                    int b) {
+        int r
+            , t; // OK
+    }
+
+    public void bar(int p
+            , int q) {  // OK
+    }
+}