Add java.RegisterRequiredBuildComponentsForTest function

Insulate tests that exercise code in the java package from having to
register the build components provided by the java package by providing
a single function that registers them all. This follows the pattern
currently used in the cc and rust packages.

This change is in preparation for switching the dex_bootjars singleton
from a singleton, which does not require a module definition in order
to be instantiated, to a singleton module which does. That will require
adding a module definition into java.GatherRequiredDepsForTest() and
this change ensures that the required components will have been
registered in every test.

Bug: 177892522
Test: m nothing
Change-Id: I6475db8240894947dd07c89a940a3e4f201aa598

java/java_test.go

@@ -73,21 +73,10 @@ func testConfig(env map[string]string, bp string, fs map[string][]byte) android.
 func testContext(config android.Config) *android.TestContext {
 
 	ctx := android.NewTestArchContext(config)
-	RegisterJavaBuildComponents(ctx)
-	RegisterAppBuildComponents(ctx)
-	RegisterAppImportBuildComponents(ctx)
-	RegisterAppSetBuildComponents(ctx)
-	RegisterAARBuildComponents(ctx)
-	RegisterGenRuleBuildComponents(ctx)
-	RegisterRuntimeResourceOverlayBuildComponents(ctx)
-	RegisterSystemModulesBuildComponents(ctx)
+	RegisterRequiredBuildComponentsForTest(ctx)
 	ctx.RegisterModuleType("java_plugin", PluginFactory)
 	ctx.RegisterModuleType("filegroup", android.FileGroupFactory)
 	ctx.RegisterModuleType("python_binary_host", python.PythonBinaryHostFactory)
-	RegisterDocsBuildComponents(ctx)
-	RegisterStubsBuildComponents(ctx)
-	RegisterPrebuiltApisBuildComponents(ctx)
-	RegisterSdkLibraryBuildComponents(ctx)
 	ctx.PreArchMutators(android.RegisterDefaultsPreArchMutators)
 	ctx.PreArchMutators(android.RegisterComponentsMutator)