Fix duplication of dependencies with alias

This commit fixes `getAllDependencies()` to stop returning duplicates
when a dependency declares an alias.

Closes gh-772

initializr-generator/src/main/java/io/spring/initializr/metadata/DependenciesCapability.java

@@ -22,6 +22,7 @@ import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import io.spring.initializr.util.VersionParser;
@@ -64,7 +65,8 @@ public class DependenciesCapability extends ServiceCapability<List<DependencyGro
 	 * @return all dependencies
 	 */
 	public Collection<Dependency> getAll() {
-		return Collections.unmodifiableCollection(this.indexedDependencies.values());
+		return Collections.unmodifiableCollection(this.indexedDependencies.values()
+				.stream().distinct().collect(Collectors.toList()));
 	}
 
 	public void validate() {

initializr-generator/src/test/java/io/spring/initializr/generator/CommandLineHelpGeneratorTests.java

@@ -16,6 +16,8 @@
 
 package io.spring.initializr.generator;
 
+import java.util.Arrays;
+
 import io.spring.initializr.metadata.Dependency;
 import io.spring.initializr.metadata.InitializrMetadata;
 import io.spring.initializr.metadata.Type;
@@ -69,6 +71,19 @@ public class CommandLineHelpGeneratorTests {
 		assertThat(content).contains("| foo-desc");
 	}
 
+	@Test
+	public void generateCapabilitiesWithAlias() {
+		Dependency dependency = createDependency("dep", "some description");
+		dependency.setAliases(Arrays.asList("legacy", "another"));
+		InitializrMetadata metadata = InitializrMetadataTestBuilder.withDefaults()
+				.addDependencyGroup("test", dependency).build();
+		String content = this.generator.generateGenericCapabilities(metadata,
+				"https://fake-service");
+		assertCommandLineCapabilities(content);
+		assertThat(content).contains("dep | some description |");
+		assertThat(content).doesNotContain("legacy").doesNotContain("another");
+	}
+
 	@Test
 	public void generateCurlCapabilities() {
 		InitializrMetadata metadata = InitializrMetadataTestBuilder.withDefaults()

initializr-generator/src/test/java/io/spring/initializr/metadata/InitializrMetadataBuilderTests.java

@@ -215,7 +215,7 @@ public class InitializrMetadataBuilderTests {
 
 	private static void assertDefaultConfig(InitializrMetadata metadata) {
 		assertThat(metadata).isNotNull();
-		assertThat(metadata.getDependencies().getAll()).hasSize(9);
+		assertThat(metadata.getDependencies().getAll()).hasSize(8);
 		assertThat(metadata.getDependencies().getContent()).hasSize(2);
 		assertThat(metadata.getTypes().getContent()).hasSize(4);
 	}