diff --git a/rust/testing.go b/rust/testing.go
index 5be71c9..75adcfc 100644
--- a/rust/testing.go
+++ b/rust/testing.go
@@ -17,13 +17,12 @@
 import (
 	"android/soong/android"
 	"android/soong/cc"
-	"android/soong/genrule"
 )
 
 // Preparer that will define all cc module types and a limited set of mutators and singletons that
 // make those module types usable.
 var PrepareForTestWithRustBuildComponents = android.GroupFixturePreparers(
-	android.FixtureRegisterWithContext(RegisterRequiredBuildComponentsForTest),
+	android.FixtureRegisterWithContext(registerRequiredBuildComponentsForTest),
 )
 
 // The directory in which rust test default modules will be defined.
@@ -197,7 +196,7 @@
 	return bp
 }
 
-func RegisterRequiredBuildComponentsForTest(ctx android.RegistrationContext) {
+func registerRequiredBuildComponentsForTest(ctx android.RegistrationContext) {
 	ctx.RegisterModuleType("rust_binary", RustBinaryFactory)
 	ctx.RegisterModuleType("rust_binary_host", RustBinaryHostFactory)
 	ctx.RegisterModuleType("rust_bindgen", RustBindgenFactory)
@@ -231,14 +230,3 @@
 	})
 	ctx.RegisterSingletonType("rust_project_generator", rustProjectGeneratorSingleton)
 }
-
-func CreateTestContext(config android.Config) *android.TestContext {
-	ctx := android.NewTestArchContext(config)
-	android.RegisterPrebuiltMutators(ctx)
-	ctx.PreArchMutators(android.RegisterDefaultsPreArchMutators)
-	genrule.RegisterGenruleBuildComponents(ctx)
-	cc.RegisterRequiredBuildComponentsForTest(ctx)
-	RegisterRequiredBuildComponentsForTest(ctx)
-
-	return ctx
-}