[Gradle] Add functional tests

gradle-twirl/build.gradle.kts

@@ -34,6 +34,8 @@ repositories {
 dependencies {
     compileOnly("com.typesafe.play:twirl-compiler_2.13:$compilerVersion")
     testImplementation("org.assertj:assertj-core:3.24.2")
+    testImplementation("commons-io:commons-io:2.13.0")
+    testImplementation("org.freemarker:freemarker:2.3.32")
 }
 
 tasks.jar {
@@ -44,23 +46,17 @@ tasks.jar {
 
 testing {
     suites {
-        // Configure the built-in test suite
         val test by getting(JvmTestSuite::class) {
-            // Use JUnit Jupiter test framework
             useJUnitJupiter("5.9.1")
-        }
-
-        // Create a new test suite
-        val functionalTest by registering(JvmTestSuite::class) {
-            dependencies {
-                // functionalTest test suite depends on the production code in tests
-                implementation(project())
-            }
-
             targets {
                 all {
-                    // This test suite should run after the built-in test suite has run its tests
-                    testTask.configure { shouldRunAfter(test) }
+                    testTask.configure {
+                        systemProperty("twirl.version", compilerVersion)
+                        project.findProperty("scala.version")?.let { scalaVersion ->
+                            val ver = (scalaVersion as String).trimEnd { !it.isDigit() }
+                            systemProperty("scala.version", ver)
+                        }
+                    }
                 }
             }
         }
@@ -94,8 +90,6 @@ gradlePlugin {
     }
 }
 
-gradlePlugin.testSourceSets.add(sourceSets["functionalTest"])
-
 val headerLicense = "Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>"
 val headerLicenseHash = "# $headerLicense"
 val headerLicenseJava = "/*\n * $headerLicense\n */"
@@ -114,8 +108,3 @@ spotless {
         licenseHeader(headerLicenseHash, "[^#]")
     }
 }
-
-tasks.named<Task>("check") {
-    // Include functionalTest as part of the check lifecycle
-    dependsOn(testing.suites.named("functionalTest"))
-}

gradle-twirl/src/main/java/play/twirl/gradle/TwirlPlugin.java

@@ -24,7 +24,7 @@
 /** A simple 'hello world' plugin. */
 public class TwirlPlugin implements Plugin<Project> {
 
-  private static final String DEFAULT_SCALA_VERSION = "2.13";
+  static final String DEFAULT_SCALA_VERSION = "2.13";
 
   private static final Map<String, String> DEFAULT_TEMPLATE_FORMATS =
       Map.of(
@@ -58,7 +58,7 @@ public void apply(final Project project) {
 
   /** Get Twirl version from Gradle Plugin MANIFEST.MF */
   private String getDefaultTwirlVersion() {
-    return getClass().getPackage().getImplementationVersion();
+    return System.getProperty("twirl.version", getClass().getPackage().getImplementationVersion());
   }
 
   private Configuration createDefaultTwirlConfiguration(

gradle-twirl/src/test/java/play/twirl/gradle/AbstractFunctionalTest.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+package play.twirl.gradle;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import freemarker.template.Configuration;
+import freemarker.template.Template;
+import freemarker.template.TemplateException;
+import java.io.File;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Map;
+import org.apache.commons.io.FileUtils;
+import org.gradle.testkit.runner.BuildResult;
+import org.gradle.testkit.runner.GradleRunner;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.io.TempDir;
+
+abstract class AbstractFunctionalTest {
+
+  @TempDir File projectDir;
+
+  File projectSourceDir;
+
+  GradleRunner runner;
+
+  Configuration freemarkerConf;
+
+  protected abstract File getProjectSourceDir();
+
+  protected abstract String getBuildFileContent();
+
+  protected String getSettingsFileContent() {
+    return "";
+  }
+
+  static String getScalaVersion() {
+    return System.getProperty("scala.version", TwirlPlugin.DEFAULT_SCALA_VERSION);
+  }
+
+  static String getTwirlVersion() {
+    return System.getProperty("twirl.version");
+  }
+
+  protected Path projectSourcePath(String path) {
+    return Paths.get(projectSourceDir.getAbsolutePath(), path);
+  }
+
+  protected Path projectPath(String path) {
+    return Paths.get(projectDir.getAbsolutePath(), path);
+  }
+
+  protected Path projectBuildPath(String path) {
+    return Paths.get(projectDir.getAbsolutePath(), "build/" + path);
+  }
+
+  @BeforeEach
+  void init() throws IOException, TemplateException {
+    projectSourceDir = getProjectSourceDir();
+    runner = GradleRunner.create().withProjectDir(projectDir).withPluginClasspath().forwardOutput();
+
+    initFreemarker();
+
+    FileUtils.writeStringToFile(
+        projectPath("build.gradle.kts").toFile(), getBuildFileContent(), UTF_8);
+    FileUtils.writeStringToFile(
+        projectPath("settings.gradle.kts").toFile(), getSettingsFileContent(), UTF_8);
+  }
+
+  protected void initFreemarker() throws IOException {
+    freemarkerConf = new Configuration(Configuration.VERSION_2_3_32);
+    freemarkerConf.setDirectoryForTemplateLoading(projectSourceDir);
+  }
+
+  protected String templateProcess(String template, Map<String, Object> params) {
+    StringWriter writer = new StringWriter();
+    try {
+      Template buildGradle = freemarkerConf.getTemplate(template);
+      buildGradle.process(params, writer);
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+    return writer.toString();
+  }
+
+  protected BuildResult build(String... args) {
+    return runner.withArguments(args).build();
+  }
+}

gradle-twirl/src/test/java/play/twirl/gradle/TwirlPluginFunctionalTest.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+package play.twirl.gradle;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Map;
+import org.apache.commons.io.FileUtils;
+import org.apache.groovy.util.Maps;
+import org.gradle.testkit.runner.BuildResult;
+import org.gradle.testkit.runner.BuildTask;
+import org.gradle.testkit.runner.TaskOutcome;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+/** A simple functional test to check a Twirl Gradle Plugin. */
+public class TwirlPluginFunctionalTest extends AbstractFunctionalTest {
+
+  @Override
+  protected File getProjectSourceDir() {
+    return new File("src/test/resources/simple");
+  }
+
+  @Override
+  protected String getBuildFileContent() {
+    Map<String, Object> params =
+        Maps.of(
+            "scalaVersion", getScalaVersion(),
+            "twirlVersion", getTwirlVersion());
+    return templateProcess("build.gradle.kts.ftlh", params);
+  }
+
+  @Test
+  @DisplayName("Test simple Gradle project with Twirl HTML template")
+  void testSimpleGradleProject() throws IOException {
+    File simpleSources = projectPath("src").toFile();
+    FileUtils.copyDirectory(projectSourcePath("src").toFile(), simpleSources);
+
+    BuildResult result = build("build");
+
+    BuildTask compileTwirlResult = result.task(":compileTwirl");
+    assertThat(compileTwirlResult).isNotNull();
+    assertThat(compileTwirlResult.getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+    assertThat(projectBuildPath("generated/sources/twirl/main/a/b/html/c.template.scala"))
+        .isNotEmptyFile();
+
+    BuildTask compileScalaResult = result.task(":compileScala");
+    assertThat(compileScalaResult).isNotNull();
+    assertThat(compileScalaResult.getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+    assertThat(projectBuildPath("classes/scala/main/a/b/html/c.class")).isNotEmptyFile();
+
+    result = build("build");
+
+    compileTwirlResult = result.task(":compileTwirl");
+    assertThat(compileTwirlResult).isNotNull();
+    assertThat(compileTwirlResult.getOutcome()).isEqualTo(TaskOutcome.UP_TO_DATE);
+  }
+}

gradle-twirl/src/test/resources/simple/build.gradle.kts.ftlh

@@ -0,0 +1,17 @@
+plugins {
+  application
+  id("com.typesafe.play.twirl")
+}
+
+repositories {
+  mavenCentral()
+  mavenLocal()
+}
+
+dependencies {
+  implementation("com.typesafe.play:twirl-api_${scalaVersion}:${twirlVersion}")
+}
+
+twirl {
+  scalaVersion.set("${scalaVersion}")
+}

gradle-twirl/src/test/resources/simple/src/main/twirl/a/b/c.scala.html

@@ -0,0 +1,6 @@
+@****************************************************************************************************************************************************
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com> *
+ ****************************************************************************************************************************************************@
+
+@(name: String)
+Hello, @name.

scripts/test-code.sh

@@ -4,4 +4,4 @@
 
 sbt "++$MATRIX_SCALA test" || exit 1
 sbt +publishLocal +compiler/publishM2 plugin/test plugin/scripted || exit 1
-(cd gradle-twirl && ./gradlew clean check -x spotlessCheck --no-daemon) || exit 1
+(cd gradle-twirl && ./gradlew clean check -x spotlessCheck --no-daemon -Pscala.version="$MATRIX_SCALA") || exit 1