Extract RoboApplication object caching to Launcher3 interface.
Multivalent tests in Launcher3 can use the interface to override
MainThreadInitializedObject instances.
Test: n/a
Flag: TEST_ONLY
Bug: 230027385
Change-Id: I9c7c4fd004ca573a003fb11cd0a19a400e95afe4
diff --git a/tests/multivalentTests/src/com/android/launcher3/RoboObjectInitializer.kt b/tests/multivalentTests/src/com/android/launcher3/RoboObjectInitializer.kt
new file mode 100644
index 0000000..c5f9f86
--- /dev/null
+++ b/tests/multivalentTests/src/com/android/launcher3/RoboObjectInitializer.kt
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * 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 com.android.launcher3
+
+import com.android.launcher3.util.MainThreadInitializedObject
+import com.android.launcher3.util.MainThreadInitializedObject.SandboxApplication
+import com.android.launcher3.util.SafeCloseable
+
+/**
+ * Initializes [MainThreadInitializedObject] instances for Robolectric tests.
+ *
+ * Unlike instrumentation tests, Robolectric creates a new application instance for each test, which
+ * could cause the various static objects defined in [MainThreadInitializedObject] to leak. Thus, a
+ * [SandboxApplication] for Robolectric tests can implement this interface to limit the lifecycle of
+ * these objects to a single test.
+ */
+interface RoboObjectInitializer {
+
+ /** Overrides an object with [type] to [value]. */
+ fun <T : SafeCloseable> initializeObject(type: MainThreadInitializedObject<T>, value: T)
+}