Removed javac bash commands to compile and run test cases, now we are using the gradle tasks to compile and run test cases

Author: MohitMaliFtechiz

lib/build.gradle

@@ -67,13 +67,6 @@ android {
         viewBinding true
     }
     ndkVersion '21.4.7075529'
-
-    configurations {
-        testCompileClasspath.extendsFrom(compileClasspath)
-        testRuntimeClasspath.extendsFrom(testCompileClasspath)
-        testImplementation.extendsFrom(implementation)
-        testRuntimeOnly.extendsFrom(runtimeOnly)
-    }
 }
 
 dependencies {
@@ -276,21 +269,40 @@ task renameLibkiwixSoFile(type: Copy) {
     }
 }
 
-task compileTestFile(type: Exec) {
-    workingDir "${projectDir}/src/test/"
-    commandLine 'javac', '-g', '-d', '.', '-s', '.', '-cp', 'junit-4.13.jar:' + buildDir.path +'/libs/*', 'test.java'
+task testSourceJar(type: Jar) {
+    from android.sourceSets.test.java.srcDirs
+    archiveName = 'test-sources.jar'
 }
 
-task runTests(type: Exec) {
-    workingDir "${projectDir}/src/test/"
+task compileTestFile(type: JavaCompile) {
+    dependsOn testSourceJar
+    source = fileTree('src/test/')
+    destinationDirectory = file('src/test/')
+    classpath = files("src/test/junit-4.13.jar" , "src/test/hamcrest-core-1.4.jar", "build/libs/test-sources.jar")
+}
+
+task runTests(type: JavaExec) {
+    workingDir("$projectDir/src/test/")
     dependsOn compileTestFile
-    commandLine 'java', '-Djava.library.path=' + buildDir.path, '-javaagent:jacoco-0.8.7/lib/jacocoagent.jar', '-cp', 'junit-4.13.jar:hamcrest-core-1.3.jar:' + buildDir.path +'/libs/*lib*.jar' + ':.', 'org.junit.runner.JUnitCore', 'test'
+    classpath = files('src/test/', 'src/test/java/', 'src/test/junit-4.13.jar', 'src/test/hamcrest-core-1.3.jar')
+    main = 'org.junit.runner.JUnitCore'
+    args = ['test']
+    jvmArgs = [
+            '-Djava.library.path=' + buildDir.path,
+            '-javaagent:jacoco-0.8.7/lib/jacocoagent.jar'
+    ]
 }
 
-task createCodeCoverageReport(type: Exec) {
+task createCodeCoverageReport(type: JavaExec) {
     workingDir "${projectDir}/src/test/"
     dependsOn runTests
-    commandLine 'java', '-jar', 'jacoco-0.8.7/lib/jacococli.jar', 'report', 'jacoco.exec', '--classfiles', 'org/kiwix/libkiwix/', '--classfiles', 'org/kiwix/libzim/', '--html', '../../build/coverage-report', '--xml', 'coverage.xml'
+    classpath = files('src/test/', 'src/test/java/', 'src/test/junit-4.13.jar', 'src/test/hamcrest-core-1.3.jar', 'src/test/jacoco-0.8.7/lib/*')
+    main = 'org.jacoco.cli.internal.Main'
+    args = [
+            'report', 'jacoco.exec',
+            '--classfiles', 'java/org/kiwix/libkiwix/', '--classfiles', 'java/org/kiwix/libzim/',
+            '--html', '../../build/coverage-report', '--xml', 'coverage.xml'
+    ]
 }
 
 task checkCurrentJavaVersion() {
@@ -302,7 +314,7 @@ task checkCurrentJavaVersion() {
 
 task generateHeader(type: Exec) {
     workingDir "${projectDir}/src/main/java/org/kiwix/"
-    commandLine 'bash', '-c', "javac -h ${buildDir}/include/javah_generated/ -d ${projectDir}/src/test/ ${getLibzimFiles()} ${getLibkiwixFiles()}"
+    commandLine 'bash', '-c', "javac -h ${buildDir}/include/javah_generated/ -d ${projectDir}/src/test/java/ ${getLibzimFiles()} ${getLibkiwixFiles()}"
 }
 
 String getLibkiwixFiles() {