add Mockito

app/build.gradle.kts

@@ -18,6 +18,7 @@ repositories {
 }
 
 val latestJmhVersion = "1.37"
+val mockitoAgent = configurations.create("mockitoAgent")
 
 dependencies {
     // Use JUnit Jupiter for testing.
@@ -27,6 +28,11 @@ dependencies {
     // Required to use the IntelliJ plugin "JMH Java Microbenchmark Harness".
     // https://stackoverflow.com/a/71286156/6334421
     jmhAnnotationProcessor("org.openjdk.jmh:jmh-generator-annprocess:$latestJmhVersion")
+
+    // Use Mockito for mocking.
+    // https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#mockito-instrumentation
+    testImplementation(libs.mockito)
+    mockitoAgent(libs.mockito) { isTransitive = false }
 }
 
 // Apply a specific Java toolchain to ease working on different environments.
@@ -60,7 +66,8 @@ tasks.register<JavaExec>("runCbmCompetition") {
     mainClass = "de.uni_marburg.powersort.benchmark.CbmCompetition"
 }
 
-tasks.named<Test>("test") {
+tasks {
+    test {
         // Use JUnit Platform for unit tests.
         useJUnitPlatform()
 
@@ -70,6 +77,11 @@ tasks.named<Test>("test") {
             // HTML reports to view with a webbrowser.
             html.required.set(true)
         }
+
+        // Mockito JDK21+ config
+        // https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#mockito-instrumentation
+        jvmArgs("-javaagent:${mockitoAgent.asPath}")
+    }
 }
 
 // https://github.com/melix/jmh-gradle-plugin/blob/master/README.adoc#configuration-options

gradle/libs.versions.toml

@@ -2,9 +2,9 @@
 # https://docs.gradle.org/current/userguide/platforms.html#sub::toml-dependencies-format
 
 [versions]
-guava = "32.1.3-jre"
-junit-jupiter = "5.10.1"
+junit-jupiter = "5.10.3"
+mockito = "5.14.0"
 
 [libraries]
-guava = { module = "com.google.guava:guava", version.ref = "guava" }
 junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit-jupiter" }
+mockito = { module = "org.mockito:mockito-core", version.ref = "mockito" }