set up jacoco for code coverage

.github/workflows/gradle.yml

@@ -51,3 +51,11 @@ jobs:
     - name: Run Integration Tests
       working-directory: ./tmp/pa
       run: ./gradlew integTest -Dtests.enableIT=true -Dtests.useDockerCluster=true
+    - name: Generate Jacoco coverage report
+      working-directory: ./tmp/pa
+      run: ./gradlew jacocoTestReport
+    - name: Upload coverage report
+      working-directory: ./tmp/pa
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      run: bash <(curl -s https://codecov.io/bash) -f ./build/reports/jacoco/test/jacocoTestReport.xml

README.md

@@ -1,5 +1,6 @@
 [![Java CI](https://github.com/opendistro-for-elasticsearch/performance-analyzer/workflows/Java%20CI/badge.svg)](https://github.com/opendistro-for-elasticsearch/performance-analyzer/actions?query=workflow%3A%22Java+CI%22)
 [![CD](https://github.com/opendistro-for-elasticsearch/performance-analyzer/workflows/CD/badge.svg)](https://github.com/opendistro-for-elasticsearch/performance-analyzer/actions?query=workflow%3ACD)
+[![codecov](https://codecov.io/gh/opendistro-for-elasticsearch/performance-analyzer/branch/master/graph/badge.svg)](https://codecov.io/gh/opendistro-for-elasticsearch/performance-analyzer)
 [![Documentation](https://img.shields.io/badge/api-reference-blue.svg)](https://opendistro.github.io/for-elasticsearch-docs/docs/pa/)
 [![Chat](https://img.shields.io/badge/chat-on%20forums-blue)](https://discuss.opendistrocommunity.dev/c/performance-analyzer/)
 ![PRs welcome!](https://img.shields.io/badge/PRs-welcome!-success)

build.gradle

@@ -34,6 +34,7 @@ plugins {
     id 'java'
     id 'nebula.ospackage' version "8.2.0"
     id 'com.github.spotbugs' version '4.0.0'
+    id 'jacoco'
 }
 
 spotbugsMain {
@@ -91,8 +92,8 @@ compileJava {
     }
 }
 
- javadoc {
-     options.addStringOption("-add-exports", "jdk.attach/sun.tools.attach=ALL-UNNAMED")
+javadoc {
+    options.addStringOption("-add-exports", "jdk.attach/sun.tools.attach=ALL-UNNAMED")
 }
 
 project.afterEvaluate {
@@ -122,6 +123,54 @@ tasks.withType(JavaCompile) {
     options.warnings = false
 }
 
+jacoco {
+    toolVersion = "0.8.5"
+}
+
+jacocoTestReport {
+    reports {
+        xml.enabled true
+        html.enabled true
+        csv.enabled false
+    }
+    afterEvaluate {
+        classDirectories.from = files(classDirectories.files.collect {
+            fileTree(dir: it,
+                    include: [
+                            '**/com/amazon/opendistro/elasticsearch/performanceanalyzer/**',
+                    ],
+                    exclude: [
+                    ])
+        })
+    }
+
+}
+
+jacocoTestCoverageVerification {
+    afterEvaluate {
+        classDirectories.from = files(classDirectories.files.collect {
+            fileTree(dir: it,
+                    include: [
+                            '**/com/amazon/opendistro/elasticsearch/performanceanalyzer/**',
+                    ],
+                    exclude: [
+                    ])
+        })
+    }
+    violationRules {
+        rule {
+            limit {
+                minimum = 0.0
+            }
+        }
+    }
+}
+
+
+// to run coverage verification during the build (and fail when appropriate)
+check.dependsOn jacocoTestCoverageVerification
+
+
 dependencies {
     if (JavaVersion.current() <= JavaVersion.VERSION_1_8) {
         compile files("${System.properties['java.home']}/../lib/tools.jar")
@@ -330,6 +379,6 @@ afterEvaluate {
     }
 
     task buildPackages(type: GradleBuild) {
-         tasks = ['build', 'buildRpm', 'buildDeb']
+        tasks = ['build', 'buildRpm', 'buildDeb']
     }
 }