[MOB-10129] Collect Coverage Reports from Android (#804)

* Add Android JaCoCo test coverage task

* Separate Android and JS Codecov reports

* Set Android coverage report path for Codecov uploader

* Run `jacocoTestReport` Gradle task in `test_android`

* Change `test_android` working directory to root

* Update Codecov coverage target

* Enhance Gradle task declarations and dependency

* Collect Android coverage from debug variant

Author: a7medev

.circleci/config.yml

@@ -29,7 +29,8 @@ jobs:
           environment:
             JEST_JUNIT_OUTPUT: test-results/jest/junit.xml
 
-      - codecov/upload
+      - codecov/upload:
+          flags: javascript
 
       - persist_to_workspace:
           root: ~/project
@@ -46,7 +47,7 @@ jobs:
     executor:
       name: android/android-machine
       tag: "2022.03.1"
-    working_directory: ~/project/example
+    working_directory: ~/project
     steps:
       - checkout:
           path: ~/project
@@ -55,10 +56,14 @@ jobs:
           command: npm install -g yarn
       - run:
           name: Install Node Packages
+          working_directory: example
           command: yarn
       - android/run-tests:
-          working-directory: ./android
+          working-directory: ./example/android
           test-command: ./gradlew test
+      - codecov/upload:
+          flags: android
+          file: android/build/reports/jacoco/jacocoTestReport/jacocoTestReport.xml
 
   validate_shell_files:
     machine:

android/build.gradle

@@ -1,5 +1,7 @@
 apply plugin: 'com.android.library'
 
+apply from: './jacoco.gradle'
+
 String getExtOrDefault(String name) {
     if (rootProject.ext.has(name)) {
         return rootProject.ext.get(name)

android/jacoco.gradle

@@ -0,0 +1,52 @@
+apply plugin: 'jacoco'
+
+jacoco {
+  toolVersion '0.8.8'
+}
+
+task jacocoTestReport(type: JacocoReport) {
+  group = 'Reporting'
+  description = 'Generate Jacoco coverage reports for the debug build.'
+
+  dependsOn 'testDebugUnitTest'
+
+  reports {
+    html.enabled true
+    xml.enabled true
+  }
+
+  def excludes = [
+      '**/R.class',
+      '**/R$*.class',
+      '**/BuildConfig.*',
+      '**/Manifest*.*',
+      '**/*Test*.*',
+      'android/**/*.*',
+      'androidx/**/*.*',
+      '**/*$ViewInjector*.*',
+      '**/*Dagger*.*',
+      '**/*MembersInjector*.*',
+      '**/*_Factory.*',
+      '**/*_Provide*Factory*.*',
+      '**/*_ViewBinding*.*',
+      '**/AutoValue_*.*',
+      '**/R2.class',
+      '**/R2$*.class',
+      '**/*Directions$*',
+      '**/*Directions.*',
+      '**/*Binding.*'
+  ]
+
+  def jClasses = "${project.buildDir}/intermediates/javac/debug/classes"
+  def javaClasses = fileTree(dir: jClasses, excludes: excludes)
+  def sourceDirs = ["${project.projectDir}/src/main/java"]
+  classDirectories.from = files(javaClasses)
+  sourceDirectories.from = files(sourceDirs)
+  executionData.from = files(["${project.buildDir}/jacoco/testDebugUnitTest.exec"])
+}
+
+tasks.whenTaskAdded { task ->
+  if (task.name == 'testDebugUnitTest') {
+    task.finalizedBy jacocoTestReport
+  }
+}

codecov.yml

@@ -8,9 +8,25 @@ coverage:
   range: "70...100"
 
   status:
-    patch:
-      default:
-        target: 90%
     project:
       default:
+        target: 50%
+    patch:
+      javascript:
         target: 90%
+        flags:
+          - javascript
+      android:
+        target: 35%
+        flags:
+          - android
+
+flags:
+  javascript:
+    carryforward: true
+    paths:
+      - src
+  android:
+    carryforward: true
+    paths:
+      - android