Fix Gradle build with Kotlin DSL assertions

Closes gh-1448

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

@@ -57,7 +57,7 @@ public abstract class GradleBuildAssert<SELF extends GradleBuildAssert<SELF>> ex
 	 * @return {@code this} assertion object
 	 */
 	public SELF hasProperty(String name, String value) {
-		return contains(String.format("%s = '%s'", name, value));
+		return contains(String.format("%s = %s", name, quote(value)));
 	}
 
 	/**
@@ -71,10 +71,12 @@ public abstract class GradleBuildAssert<SELF extends GradleBuildAssert<SELF>> ex
 			throw new IllegalArgumentException("Size must be even, it is a set of property=value pairs");
 		}
 		for (int i = 0; i < values.length; i += 2) {
-			builder.append(String.format("\tset('%s', \"%s\")%n", values[i], values[i + 1]));
+			builder.append(String.format("\tset(%s, \"%s\")%n", quote(values[i]), values[i + 1]));
 		}
 		builder.append("}");
 		return contains(builder.toString());
 	}
 
+	protected abstract String quote(String value);
+
 }

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

@@ -35,6 +35,11 @@ public class GroovyDslGradleBuildAssert extends GradleBuildAssert<GroovyDslGradl
 		this(TextTestUtils.readContent(buildGradleFile));
 	}
 
+	@Override
+	protected String quote(String value) {
+		return "'" + value + "'";
+	}
+
 	/**
 	 * Assert {@code build.gradle} defines a plugin with the specified id and version.
 	 * @param id the id of the plugin
@@ -42,7 +47,7 @@ public class GroovyDslGradleBuildAssert extends GradleBuildAssert<GroovyDslGradl
 	 * @return {@code this} assertion object
 	 */
 	public GroovyDslGradleBuildAssert hasPlugin(String id, String version) {
-		return contains(String.format("id '%s' version '%s'", id, version));
+		return contains(String.format("id %s version %s", quote(id), quote(version)));
 	}
 
 	/**
@@ -51,7 +56,7 @@ public class GroovyDslGradleBuildAssert extends GradleBuildAssert<GroovyDslGradl
 	 * @return {@code this} assertion object
 	 */
 	public GroovyDslGradleBuildAssert hasPlugin(String id) {
-		return contains(String.format("id '%s'", id));
+		return contains(String.format("id %s", quote(id)));
 	}
 
 }

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

@@ -24,6 +24,7 @@ import io.spring.initializr.generator.test.io.TextTestUtils;
  * Simple assertions for a kotlin build using the kotlin DSL.
  *
  * @author Prithvi singh
+ * @author Stephane Nicoll
  */
 public class KotlinDslGradleBuildAssert extends GradleBuildAssert<KotlinDslGradleBuildAssert> {
 
@@ -35,6 +36,11 @@ public class KotlinDslGradleBuildAssert extends GradleBuildAssert<KotlinDslGradl
 		this(TextTestUtils.readContent(buildGradleFile));
 	}
 
+	@Override
+	protected String quote(String value) {
+		return "\"" + value + "\"";
+	}
+
 	/**
 	 * Assert {@code build.gradle.kts} defines a plugin with the specified id and version.
 	 * @param id the id of the plugin
@@ -42,7 +48,7 @@ public class KotlinDslGradleBuildAssert extends GradleBuildAssert<KotlinDslGradl
 	 * @return {@code this} assertion object
 	 */
 	public KotlinDslGradleBuildAssert hasPlugin(String id, String version) {
-		return contains(String.format("id('%s') version '%s'", id, version));
+		return contains(String.format("id(%s) version %s", quote(id), quote(version)));
 	}
 
 	/**
@@ -51,7 +57,7 @@ public class KotlinDslGradleBuildAssert extends GradleBuildAssert<KotlinDslGradl
 	 * @return {@code this} assertion object
 	 */
 	public KotlinDslGradleBuildAssert hasPlugin(String id) {
-		return contains(String.format("id('%s')", id));
+		return contains(String.format("id(%s)", quote(id)));
 	}
 
 }

initializr-generator-test/src/test/resources/project/build/gradle/sample-build.gradle.kts

@@ -1,23 +1,23 @@
 plugins {
-	id('com.example') version '1.0.0.RELEASE'
+	id("com.example") version "1.0.0.RELEASE"
-	id('java')
+	id("java")
 }
 
-group = 'com.example'
+group = "com.example"
-version = '0.0.1-SNAPSHOT'
+version = "0.0.1-SNAPSHOT"
-sourceCompatibility = '1.8'
+sourceCompatibility = "1.8"
 
 repositories {
 	mavenCentral()
 }
 
 ext {
-	set('acmeVersion', "Brussels.SR2")
+	set("acmeVersion", "Brussels.SR2")
 }
 
 dependencies {
-	implementation 'com.example.acme:library'
+	implementation "com.example.acme:library"
-	testImplementation 'com.example.acme:library-test'
+	testImplementation "com.example.acme:library-test"
 }
 
 dependencyManagement {