diff --git a/python/Android.bp b/python/Android.bp
index b633f1e..e49fa6a 100644
--- a/python/Android.bp
+++ b/python/Android.bp
@@ -20,6 +20,7 @@
         "proto.go",
         "python.go",
         "test.go",
+        "testing.go",
     ],
     testSrcs: [
         "python_test.go",
diff --git a/python/binary.go b/python/binary.go
index 372b8a8..6061ad4 100644
--- a/python/binary.go
+++ b/python/binary.go
@@ -26,10 +26,14 @@
 )
 
 func init() {
-	android.RegisterModuleType("python_binary_host", PythonBinaryHostFactory)
+	registerPythonBinaryComponents(android.InitRegistrationContext)
 	android.RegisterBp2BuildMutator("python_binary_host", PythonBinaryBp2Build)
 }
 
+func registerPythonBinaryComponents(ctx android.RegistrationContext) {
+	ctx.RegisterModuleType("python_binary_host", PythonBinaryHostFactory)
+}
+
 type bazelPythonBinaryAttributes struct {
 	Main           string
 	Srcs           bazel.LabelList
diff --git a/python/library.go b/python/library.go
index b724d2b..9663b3c 100644
--- a/python/library.go
+++ b/python/library.go
@@ -21,8 +21,12 @@
 )
 
 func init() {
-	android.RegisterModuleType("python_library_host", PythonLibraryHostFactory)
-	android.RegisterModuleType("python_library", PythonLibraryFactory)
+	registerPythonLibraryComponents(android.InitRegistrationContext)
+}
+
+func registerPythonLibraryComponents(ctx android.RegistrationContext) {
+	ctx.RegisterModuleType("python_library_host", PythonLibraryHostFactory)
+	ctx.RegisterModuleType("python_library", PythonLibraryFactory)
 }
 
 func PythonLibraryHostFactory() android.Module {
diff --git a/python/python.go b/python/python.go
index a078c0b..4444a70 100644
--- a/python/python.go
+++ b/python/python.go
@@ -29,7 +29,11 @@
 )
 
 func init() {
-	android.PreDepsMutators(RegisterPythonPreDepsMutators)
+	registerPythonMutators(android.InitRegistrationContext)
+}
+
+func registerPythonMutators(ctx android.RegistrationContext) {
+	ctx.PreDepsMutators(RegisterPythonPreDepsMutators)
 }
 
 // Exported to support other packages using Python modules in tests.
diff --git a/python/test.go b/python/test.go
index b7cd475..6713189 100644
--- a/python/test.go
+++ b/python/test.go
@@ -22,8 +22,12 @@
 // This file contains the module types for building Python test.
 
 func init() {
-	android.RegisterModuleType("python_test_host", PythonTestHostFactory)
-	android.RegisterModuleType("python_test", PythonTestFactory)
+	registerPythonTestComponents(android.InitRegistrationContext)
+}
+
+func registerPythonTestComponents(ctx android.RegistrationContext) {
+	ctx.RegisterModuleType("python_test_host", PythonTestHostFactory)
+	ctx.RegisterModuleType("python_test", PythonTestFactory)
 }
 
 // Test option struct.
diff --git a/python/testing.go b/python/testing.go
new file mode 100644
index 0000000..ce1a5ab
--- /dev/null
+++ b/python/testing.go
@@ -0,0 +1,24 @@
+// Copyright 2021 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package python
+
+import "android/soong/android"
+
+var PrepareForTestWithPythonBuildComponents = android.GroupFixturePreparers(
+	android.FixtureRegisterWithContext(registerPythonBinaryComponents),
+	android.FixtureRegisterWithContext(registerPythonLibraryComponents),
+	android.FixtureRegisterWithContext(registerPythonTestComponents),
+	android.FixtureRegisterWithContext(registerPythonMutators),
+)