Handle ConfigurationFileFormat in description copy and diff

The ConfigurationFileFormat introduced in gh-1682 is not handled
in the MutableProjectDescription copy constructor or in
ProjectDescriptionDiff.

This commit adds the missing logic and corresponding tests.

See gh-1693

Signed-off-by: sijun-yang <yangsijun5528@gmail.com>

Author: YangSiJun528

initializr-generator/src/main/java/io/spring/initializr/generator/project/MutableProjectDescription.java

@@ -79,6 +79,7 @@ protected MutableProjectDescription(MutableProjectDescription source) {
 		this.buildSystem = source.getBuildSystem();
 		this.packaging = source.getPackaging();
 		this.language = source.getLanguage();
+		this.configurationFileFormat = source.getConfigurationFileFormat();
 		this.requestedDependencies.putAll(source.getRequestedDependencies());
 		this.groupId = source.getGroupId();
 		this.artifactId = source.getArtifactId();

initializr-generator/src/main/java/io/spring/initializr/generator/project/ProjectDescriptionDiff.java

@@ -20,6 +20,7 @@
 import java.util.function.BiConsumer;
 
 import io.spring.initializr.generator.buildsystem.BuildSystem;
+import io.spring.initializr.generator.configuration.format.ConfigurationFileFormat;
 import io.spring.initializr.generator.language.Language;
 import io.spring.initializr.generator.packaging.Packaging;
 import io.spring.initializr.generator.version.Version;
@@ -100,6 +101,19 @@ public void ifLanguageChanged(ProjectDescription current, BiConsumer<Language, L
 		}
 	}
 
+	/**
+	 * Calls the specified consumer if the {@code configurationFileFormat} is different on
+	 * the original source project description than the specified project description.
+	 * @param current the description to test against
+	 * @param consumer to call if the property has changed
+	 */
+	public void ifConfigurationFileFormatChanged(ProjectDescription current,
+			BiConsumer<ConfigurationFileFormat, ConfigurationFileFormat> consumer) {
+		if (!Objects.equals(this.original.getConfigurationFileFormat(), current.getConfigurationFileFormat())) {
+			consumer.accept(this.original.getConfigurationFileFormat(), current.getConfigurationFileFormat());
+		}
+	}
+
 	/**
 	 * Calls the specified consumer if the {@code groupId} is different on the original
 	 * source project description than the specified project description.

initializr-generator/src/test/java/io/spring/initializr/generator/project/ProjectDescriptionDiffTests.java

@@ -22,6 +22,9 @@
 import io.spring.initializr.generator.buildsystem.BuildSystem;
 import io.spring.initializr.generator.buildsystem.gradle.GradleBuildSystem;
 import io.spring.initializr.generator.buildsystem.maven.MavenBuildSystem;
+import io.spring.initializr.generator.configuration.format.ConfigurationFileFormat;
+import io.spring.initializr.generator.configuration.format.properties.PropertiesFormat;
+import io.spring.initializr.generator.configuration.format.yaml.YamlFormat;
 import io.spring.initializr.generator.language.Language;
 import io.spring.initializr.generator.language.java.JavaLanguage;
 import io.spring.initializr.generator.packaging.Packaging;
@@ -58,6 +61,8 @@ void projectDescriptionDiffWithUnmodifiedDescriptionDoesNotInvokeConsumer() {
 		diff.ifBuildSystemChanged(description, (original, actual) -> fail("Values should not have changed"));
 		diff.ifPackagingChanged(description, (original, actual) -> fail("Values should not have changed"));
 		diff.ifLanguageChanged(description, (original, actual) -> fail("Values should not have changed"));
+		diff.ifConfigurationFileFormatChanged(description,
+				(original, actual) -> fail("Values should not have changed"));
 		diff.ifGroupIdChanged(description, (original, actual) -> fail("Values should not have changed"));
 		diff.ifArtifactIdChanged(description, (original, actual) -> fail("Values should not have changed"));
 		diff.ifVersionChanged(description, (original, actual) -> fail("Values should not have changed"));
@@ -112,6 +117,17 @@ void projectDescriptionDiffWithModifiedLanguageInvokesConsumer() {
 		validateConsumer(original, actual, (consumer) -> diff.ifLanguageChanged(description, consumer));
 	}
 
+	@Test
+	void projectDescriptionDiffWithModifiedConfigurationFileFormatInvokesConsumer() {
+		ConfigurationFileFormat original = ConfigurationFileFormat.forId(YamlFormat.ID);
+		ConfigurationFileFormat actual = ConfigurationFileFormat.forId(PropertiesFormat.ID);
+		MutableProjectDescription description = new MutableProjectDescription();
+		description.setConfigurationFileFormat(original);
+		ProjectDescriptionDiff diff = new ProjectDescriptionDiff(description);
+		description.setConfigurationFileFormat(actual);
+		validateConsumer(original, actual, (consumer) -> diff.ifConfigurationFileFormatChanged(description, consumer));
+	}
+
 	@Test
 	void projectDescriptionDiffWithModifiedGroupIdInvokesConsumer() {
 		String original = "com.example";