Adding mutation testing to build gradle with PiTest

.github/workflows/sql-test-and-build-workflow.yml

@@ -44,6 +44,12 @@ jobs:
     - name: Build with Gradle
       run: ./gradlew --continue build ${{ matrix.entry.os_build_args }}
 
+    - name: PiTest with Gradle
+      run: |
+        ./gradlew :core:pitest
+        ./gradlew :opensearch:pitest
+
+
     - name: Run backward compatibility tests
       if: ${{ matrix.entry.os == 'ubuntu-latest' }}
       run: ./scripts/bwctest.sh

DEVELOPER_GUIDE.rst

@@ -220,8 +220,12 @@ Most of the time you just need to run ./gradlew build which will make sure you p
      - Run all unit tests.
    * - ./gradlew :integ-test:integTest
      - Run all integration test (this takes time).
+   * - ./gradlew :doctest:doctest
+     - Run doctests
    * - ./gradlew build
      - Build plugin by run all tasks above (this takes time).
+   * - ./gradlew pitest
+     - Run PiTest mutation testing (see more info in `#1204 <https://github.com/opensearch-project/sql/pull/1204>`_)
 
 For integration test, you can use ``-Dtests.class`` “UT full path” to run a task individually. For example ``./gradlew :integ-test:integTest -Dtests.class="*QueryIT"``.
 

core/build.gradle

@@ -26,13 +26,23 @@ plugins {
     id 'java-library'
     id "io.freefair.lombok"
     id 'jacoco'
+    id 'info.solidsoft.pitest' version '1.9.0'
     id 'java-test-fixtures'
 }
 
 repositories {
     mavenCentral()
 }
 
+pitest {
+    targetClasses = ['org.opensearch.sql.*']
+    pitestVersion = '1.9.0'
+    threads = 4
+    outputFormats = ['HTML', 'XML']
+    timestampedReports = false
+    junit5PluginVersion = '1.0.0'
+}
+
 dependencies {
     api group: 'com.google.guava', name: 'guava', version: '31.0.1-jre'
     api group: 'org.springframework', name: 'spring-context', version: "${spring_version}"

opensearch/build.gradle

@@ -26,6 +26,7 @@ plugins {
     id 'java-library'
     id "io.freefair.lombok"
     id 'jacoco'
+    id 'info.solidsoft.pitest' version '1.9.0'
 }
 
 dependencies {
@@ -47,6 +48,15 @@ dependencies {
     testImplementation group: 'org.opensearch.test', name: 'framework', version: "${opensearch_version}"
 }
 
+pitest {
+    targetClasses = ['org.opensearch.sql.*']
+    pitestVersion = '1.9.0'
+    threads = 4
+    outputFormats = ['HTML', 'XML']
+    timestampedReports = false
+    junit5PluginVersion = '1.0.0'
+}
+
 test {
     useJUnitPlatform()
     testLogging {