Ensure Gradle tasks are configured lazily

At present, generated Gradle build scripts that use Groovy DSL configure
tasks eagerly. This is both suboptimal and actually not aligned with the
generated build scripts that use Kotlin DSL, which configures tasks
lazily.

This commit updates `GroovyDslGradleBuildWriter` to ensure tasks are
configured lazily.

See gh-1292

initializr-generator-spring/src/test/java/io/spring/initializr/generator/spring/build/gradle/GradleProjectGenerationConfigurationTests.java

@@ -129,7 +129,7 @@ class GradleProjectGenerationConfigurationTests {
 				"    testImplementation 'org.springframework.boot:spring-boot-starter-test'",
 				"}",
 				"",
-				"test {",
+				"tasks.named('test') {",
 				"    useJUnitPlatform()",
 				"}"); // @formatter:on
 	}
@@ -150,7 +150,8 @@ class GradleProjectGenerationConfigurationTests {
 		description.setPlatformVersion(Version.parse("2.2.4.RELEASE"));
 		description.setLanguage(new JavaLanguage());
 		ProjectStructure project = this.projectTester.generate(description);
-		assertThat(project).textFile("build.gradle").lines().containsSequence("test {", "    useJUnitPlatform()", "}");
+		assertThat(project).textFile("build.gradle").lines().containsSequence("tasks.named('test') {",
+				"    useJUnitPlatform()", "}");
 	}
 
 	@Test

initializr-generator-spring/src/test/resources/project/gradle/annotation-processor-dependency-build.gradle.gen

@@ -25,6 +25,6 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/gradle/bom-ordering-build.gradle.gen

@@ -25,6 +25,6 @@ dependencyManagement {
 	}
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/gradle/bom-property-build.gradle.gen

@@ -27,6 +27,6 @@ dependencyManagement {
 	}
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/gradle/compile-only-dependency-build.gradle.gen

@@ -19,6 +19,6 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/gradle/kotlin-java11-build.gradle.gen

@@ -29,6 +29,6 @@ tasks.withType(KotlinCompile) {
 	}
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/gradle/repositories-build.gradle.gen

@@ -20,6 +20,6 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/gradle/repositories-milestone-build.gradle.gen

@@ -18,6 +18,6 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/gradle/version-override-build.gradle.gen

@@ -22,6 +22,6 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/groovy/standard/build.gradle.gen

@@ -18,6 +18,6 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/groovy/standard/war-build.gradle.gen

@@ -20,6 +20,6 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/java/standard/build.gradle.gen

@@ -17,6 +17,6 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/java/standard/war-build.gradle.gen

@@ -19,6 +19,6 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/kotlin/standard/build.gradle.gen

@@ -29,6 +29,6 @@ tasks.withType(KotlinCompile) {
 	}
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator-spring/src/test/resources/project/kotlin/standard/war-build.gradle.gen

@@ -31,6 +31,6 @@ tasks.withType(KotlinCompile) {
 	}
 }
 
-test {
+tasks.named('test') {
 	useJUnitPlatform()
 }

initializr-generator/src/main/java/io/spring/initializr/generator/buildsystem/gradle/GroovyDslGradleBuildWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -190,7 +190,7 @@ public class GroovyDslGradleBuildWriter extends GradleBuildWriter {
 		});
 		tasks.values().filter((candidate) -> candidate.getType() == null).forEach((task) -> {
 			writer.println();
-			writer.println(task.getName() + " {");
+			writer.println("tasks.named('" + task.getName() + "') {");
 			writer.indented(() -> writeTaskCustomization(writer, task));
 			writer.println("}");
 		});

initializr-generator/src/test/java/io/spring/initializr/generator/buildsystem/gradle/GroovyDslGradleBuildWriterTests.java

@@ -170,7 +170,8 @@ class GroovyDslGradleBuildWriterTests {
 			task.invoke("dependsOn", "test");
 		});
 		List<String> lines = generateBuild(build);
-		assertThat(lines).containsSequence("asciidoctor {", "    inputs.dir snippetsDir", "    dependsOn test", "}");
+		assertThat(lines).containsSequence("tasks.named('asciidoctor') {", "    inputs.dir snippetsDir",
+				"    dependsOn test", "}");
 	}
 
 	@Test
@@ -178,7 +179,7 @@ class GroovyDslGradleBuildWriterTests {
 		GradleBuild build = new GradleBuild();
 		build.tasks().customize("test", (task) -> task.invoke("myMethod"));
 		List<String> lines = generateBuild(build);
-		assertThat(lines).containsSequence("test {", "    myMethod()", "}");
+		assertThat(lines).containsSequence("tasks.named('test') {", "    myMethod()", "}");
 	}
 
 	@Test
@@ -189,7 +190,7 @@ class GroovyDslGradleBuildWriterTests {
 			task.attribute("kotlinOptions.jvmTarget", "'1.8'");
 		});
 		List<String> lines = generateBuild(build);
-		assertThat(lines).containsSequence("compileKotlin {",
+		assertThat(lines).containsSequence("tasks.named('compileKotlin') {",
 				"    kotlinOptions.freeCompilerArgs = ['-Xjsr305=strict']", "    kotlinOptions.jvmTarget = '1.8'", "}");
 	}
 
@@ -202,7 +203,7 @@ class GroovyDslGradleBuildWriterTests {
 					kotlinOptions.attribute("jvmTarget", "'1.8'");
 				}));
 		List<String> lines = generateBuild(build);
-		assertThat(lines).containsSequence("compileKotlin {", "    kotlinOptions {",
+		assertThat(lines).containsSequence("tasks.named('compileKotlin') {", "    kotlinOptions {",
 				"        freeCompilerArgs = ['-Xjsr305=strict']", "        jvmTarget = '1.8'", "    }", "}");
 	}