build.gradle

// Rectangle freeze tag — build, test, and run.
//
//   ./gradlew run     play it
//   ./gradlew test    run the unit tests (headless, no window)
//   ./gradlew build   compile + test + jar
//
// In 2018 this was an Eclipse project whose .classpath pointed at
// org.eclipse.jdt.USER_LIBRARY/StdDraw — a library registered inside one
// Eclipse installation. It was never in the repo, so cloning this project
// and building it was impossible for anyone (including future-Paula on a
// new laptop). Declaring the dependency here is what fixes that.

plugins {
    id 'application'
    id 'java'
}

repositories {
    mavenCentral()
}

dependencies {
    // Princeton's stdlib, which provides edu.princeton.cs.introcs.StdDraw.
    // This is the only publicly available build of StdDraw that still uses
    // the edu.princeton.cs.introcs package — Princeton's current stdlib.jar
    // puts its classes in the default package instead. See README for the
    // two API call differences this implies.
    implementation 'com.googlecode.princeton-java-introduction:stdlib:1.0.1'

    testImplementation platform('org.junit:junit-bom:5.11.3')
    testImplementation 'org.junit.jupiter:junit-jupiter'
    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
}

java {
    toolchain {
        // 2018 Eclipse targeted Java 9, which is long past end of life.
        languageVersion = JavaLanguageVersion.of(21)
    }
}

application {
    mainClass = 'MovingRectangleDriver'
}

test {
    useJUnitPlatform()
    // The game draws with StdDraw (AWT/Swing), but MovingRectangle itself is
    // pure logic — no window is ever opened by the tests. Forcing headless
    // keeps that honest: if a test ever touches the GUI, it fails here
    // instead of hanging a CI runner.
    systemProperty 'java.awt.headless', 'true'
    testLogging {
        events 'passed', 'failed', 'skipped'
    }
}