JaCoCO code and coverage report (#2714)

* chore: updated groovy-test dependency and fixed missing import

* feat: jacoco report

* feat: css in report

* fix: fixed navigation

* chore: simplified jacoco configuration

* feat: project-wise reports

* chore: styling on sub-projects

* fix: fixed percentage in root report

* chore: home button, bugged

* chore: fixed home link

* chore: some more styyling

* feat: full control over css

* chore: code clean-up

* chore: better navigation

* chore: gemini suggested improvements

* chore: updated readme

* fix: fixed bugged condition

* fix: fixed root report coverages

* fix: more gemini fixes

* chore: initialized parser just one time

* fix: fixed project exploration

* fix: more gemini suggested fixes

* fix: fixed slurper initialization

Author: aegroto

README.md

@@ -109,3 +109,18 @@ You can run the "jme3-examples" app:
 You can restore the project to a pristine state:
 + using Bash or Fish or PowerShell or Zsh: `./gradlew clean`
 + using Windows Command Prompt: `.\gradlew clean`
+
+## Running Tests 
+
+To run all tests and generate a JaCoCo code coverage report, run the `testCodeCoverageReport` Gradle task. To avoid the generation of the report, use the `test` task instead.
+
+This runs all subproject tests and produces two sets of HTML reports:
+
+- **Aggregated report** (all modules combined):
+  `build/reports/jacoco/testCodeCoverageReport/html/index.html`
+- **Per-module reports**:
+  `<module>/build/reports/jacoco/test/html/index.html`
+
+A summary index linking to every per-module report is also generated at:
+`build/reports/jacoco/index.html`
+

build.gradle

@@ -173,6 +173,8 @@ ext {
     ndkExists       = false
 }
 
+apply from: 'gradle/jacoco.gradle'
+
 task configureAndroidNDK {
     def ndkBuildFile = "ndk-build"
     // if windows, use ndk-build.cmd instead