feat: add mutation testing element transformation

action.yml

@@ -14,6 +14,7 @@ inputs:
 runs:
   using: composite
   steps:
+    - uses: dcarbone/install-jq-action@e397bd87438d72198f81efd21f876461183d383a # v3.0.1
     - uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
       with:
         python-version: '3.12'
@@ -32,6 +33,9 @@ runs:
             { echo '<testExecutions version="1">'; xsltproc ${GITHUB_ACTION_PATH}/converters/gtest-to-generic-execution.xslt ${{ inputs.input }}; echo '</testExecutions>'; } | tee ${{ inputs.output }} > /dev/null
             ;;
           'mutation-test-to-generic-issue')
+            MERGED_MUTATION_FILE=$(mktemp)
+            jq -s 'reduce .[] as $item ({}; . * $item)' ${{ inputs.input }} > ${MERGED_MUTATION_FILE}
+            jq --arg workspace "${GITHUB_WORKSPACE}" -f ${GITHUB_ACTION_PATH}/converters/mutation-elements-to-generic-issue.jq ${MERGED_MUTATION_FILE} > ${{ inputs.output }}
             ;;
           *)
             echo 'Unknown transformation type: ${{ inputs.transformation }}'

converters/mutation-elements-to-generic-issue.jq

@@ -0,0 +1,52 @@
+# This jq filter transforms a mutation testing elements report to the SonarQube generic issue import format.
+
+.framework.name as $frameworkName
+| .projectRoot as $projectRoot
+| .files
+| to_entries
+| {
+    issues: map(
+        .value.mutants[] as $mutants
+        | del(.value) as $file
+        | $mutants
+        | select(.status == ("Survived", "NoCoverage"))
+        | (
+            if .replacement then
+                "The mutation operator '" + .mutatorName + "' has mutated the input to " + .replacement + " without any tests failing."
+            else
+                "The mutation operator '" + .mutatorName + "' has mutated the input without any tests failing."
+            end
+        ) as $mutation
+        | {
+            engineId: ($frameworkName // "Mutation Testing"),
+            ruleId: ("Mutant" + .status),
+            primaryLocation: {
+                message: (
+                    if .status == "NoCoverage" then
+                        "A mutant was not covered by any of the tests. " + $mutation
+                    else
+                        "A mutant survived after running the tests. " + $mutation
+                    end
+                ),
+                filePath: (
+                    if $ARGS.named["workspace"] != null then
+                        $file.key | sub("^" + $ARGS.named["workspace"] + "/"; "")
+                    elif $projectRoot then
+                        $file.key | sub("^" + $projectRoot + "/"; "")
+                    else
+                        $file.key
+                    end
+                ),
+                textRange: {
+                    startLine: .location.start.line,
+                    endLine: .location.end.line,
+                    startColumn: (.location.start.column - 1),
+                    endColumn: (.location.end.column - 1)
+                }
+            },
+            type: "CODE_SMELL",
+            severity: "MAJOR",
+            effortMinutes: 10
+        }
+    )
+}