Project Code Coverage

Signed-off-by: Prudhvi Godithi <[email protected]>

Author: prudhvigodithi

TESTING.md

@@ -518,22 +518,48 @@ Example:
 
 # Test coverage analysis
 
-The code coverage report can be generated through Gradle with [JaCoCo plugin](https://docs.gradle.org/current/userguide/jacoco_plugin.html).
+The code coverage report can be generated through Gradle with [JaCoCo plugin](https://docs.gradle.org/current/userguide/jacoco_plugin.html). Following are some of the ways to generate the code coverage reports locally.
 
 For unit test:
 
+    ./gradlew test
     ./gradlew jacocoTestReport
 
+For unit test inside a specific module:
+
+    ./gradlew :server:test
+    ./gradlew :server:jacocoTestReport
+
+For specific unit test inside a specific module:
+
+    ./gradlew :server:test --tests "org.opensearch.search.approximate.ApproximatePointRangeQueryTests.testNycTaxiDataDistribution"
+    ./gradlew :server:jacocoTestReport -Dtests.coverage.report.html=true
+
 For integration test:
 
+    ./gradlew internalClusterTest
+    ./gradlew jacocoTestReport
+
+For integration test inside a specific module:
+
+    ./gradlew :server:internalClusterTest
+    ./gradlew :server:jacocoTestReport
+
+For specific integration test inside a specific module:
+
+    ./gradlew :server:internalClusterTest --tests "org.opensearch.action.admin.ClientTimeoutIT.testNodesInfoTimeout"
     ./gradlew :server:jacocoTestReport
 
+For modules with javaRestTest:
+
+    ./gradlew :qa:die-with-dignity:javaRestTest
+    ./gradlew :qa:die-with-dignity:jacocoTestReport -Dtests.coverage.report.html=true
 
 To generate coverage report for the combined tests after `check` task:
 
     ./gradlew check -Dtests.coverage=true
 
-The code coverage report will be generated in `build/codeCoverageReport`, `build/codeCoverageReportForUnitTest` or `build/codeCoverageReportForIntegrationTest` correspondingly.
+The code coverage report will be generated in `$buildDir/build/reports/jacoco/test/html/`.
 
 The report will be in XML format only by default, but you can add the following parameter for HTML and CSV format.
 
@@ -543,7 +569,7 @@ The report will be in XML format only by default, but you can add the following
 
 For example, to generate code coverage report in HTML format and not in XML format:
 
-    ./gradlew jacocoTestReport -Dtests.coverage.report.html=true -Dtests.coverage.report.xml=false
+    ./gradlew internalClusterTest -Dtests.coverage.report.html=true -Dtests.coverage.report.xml=false
 
 Apart from using Gradle, it is also possible to gain insight in code coverage using IntelliJ’s built-in coverage analysis tool that can measure coverage upon executing specific tests. Eclipse may also be able to do the same using the EclEmma plugin.
 

gradle/code-coverage.gradle

@@ -39,32 +39,24 @@ allprojects {
   plugins.withId('jacoco') {
     // Configure both jacocoTestReport and testCodeCoverageReport tasks
     tasks.matching { it.name == 'jacocoTestReport' || it.name == 'testCodeCoverageReport' }.configureEach {
-      // Collect execution data files from all available test tasks
       def executionDataFiles = []
       def sourceSetsList = []
-      
       if (tasks.findByName('test')) {
         executionDataFiles.add("$buildDir/jacoco/test.exec")
         sourceSetsList.add(sourceSets.test)
       }
-
       if (tasks.findByName('internalClusterTest')) {
         executionDataFiles.add("$buildDir/jacoco/internalClusterTest.exec")
         sourceSetsList.add(sourceSets.internalClusterTest)
       }
-
       if (tasks.findByName('javaRestTest')) {
         executionDataFiles.add("$buildDir/jacoco/javaRestTest.exec")
         sourceSetsList.add(sourceSets.javaRestTest)
       }
-      
-      // Set execution data and source sets
       if (!executionDataFiles.isEmpty()) {
         executionData.setFrom(files(executionDataFiles).filter { it.exists() })
         sourceSets(*sourceSetsList)
       }
-
-      // Only run if at least one execution data file exists
       onlyIf {
         file("$buildDir/jacoco/test.exec").exists() ||
           file("$buildDir/jacoco/internalClusterTest.exec").exists() ||