fix: gradle-tooling-api dependency is added to the target project (#51)

Signed-off-by: Marc Nuri <marc@marcnuri.com>

src/it/gradle-tooling-api/invoker.properties

@@ -1 +1 @@
-invoker.goals.1=verify
+invoker.goals.1=verify dependency:tree

src/it/gradle-tooling-api/verify.groovy

@@ -1,5 +1,6 @@
 import java.util.jar.JarFile
 
+// Dependency is downloaded to the local Maven repository
 def gradleToolingApiJar = new File(projectBuildDirectory,
     "local-repo/org/gradle/gradle-tooling-api/${versionGradle8}/gradle-tooling-api-${versionGradle8}.jar")
 assert gradleToolingApiJar.exists()
@@ -16,3 +17,7 @@ jar.entries().each {
 }
 assert containsManifest
 assert containsGradleApi
+
+// Project contains dependency to gradle-tooling-api (dependency:tree output)
+def buildLog = new File(basedir, 'build.log').text
+assert buildLog.contains('[INFO] +- org.gradle:gradle-tooling-api:jar:')

src/main/java/com/marcnuri/plugins/gradle/api/GradleApi.java

@@ -50,7 +50,9 @@ public final Collection<String> call() {
       downloadDistribution();
       downloadGradleToolingApi();
     }
-    return extract();
+    final Set<String> artifactIds = extract();
+    artifactIds.add(GRADLE_TOOLING_API_ARTIFACT_ID);
+    return artifactIds;
   }
 
   private void downloadDistribution() {