Fix test failures

Author: daymxn

buildSrc/src/main/java/com/google/firebase/gradle/plugins/FirebaseJavaLibraryPlugin.kt

@@ -52,6 +52,8 @@ class FirebaseJavaLibraryPlugin : BaseFirebaseLibraryPlugin() {
     setupFirebaseLibraryExtension(project)
     registerMakeReleaseNotesTask(project)
 
+    project.apply<DackkaPlugin>()
+
     // reduce the likelihood of kotlin module files colliding.
     project.tasks.withType<KotlinCompile> {
       kotlinOptions.freeCompilerArgs = ImmutableList.of("-module-name", kotlinModuleName(project))

buildSrc/src/test/kotlin/com/google/firebase/gradle/plugins/publishing.kt

@@ -46,7 +46,7 @@ data class Project(
             version = '$version'
             ${if (latestReleasedVersion != null) "ext.latestReleasedVersion = $latestReleasedVersion" else ""}
             firebaseLibrary {
-                ${if (libraryGroup != null) "libraryGroup '$libraryGroup'" else ""}
+                ${if (libraryGroup != null) "libraryGroup = '$libraryGroup'" else ""}
                 ${if (customizePom != null) "customizePom {$customizePom}" else ""}
                 ${"publishJavadoc = $publishJavadoc"}
             }