1 files changed, 96 insertions, 0 deletions
diff --git a/sdksandbox/tests/unittest/src/android/app/sdksandbox/SdkSandboxLocalSingletonUnitTest.java b/sdksandbox/tests/unittest/src/android/app/sdksandbox/SdkSandboxLocalSingletonUnitTest.java
new file mode 100644
index 0000000000..32ba47245e
--- /dev/null
+++ b/sdksandbox/tests/unittest/src/android/app/sdksandbox/SdkSandboxLocalSingletonUnitTest.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2022 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 android.app.sdksandbox;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assert.assertThrows;
+
+import android.os.IBinder;
+import android.os.RemoteException;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+import org.mockito.Mockito;
+
+@RunWith(JUnit4.class)
+public class SdkSandboxLocalSingletonUnitTest {
+    private IBinder mBinder;
+
+    @Before
+    public void setup() throws RemoteException {
+        mBinder = Mockito.mock(IBinder.class);
+        Mockito.when(mBinder.getInterfaceDescriptor()).thenReturn(ISdkToServiceCallback.DESCRIPTOR);
+    }
+
+    @After
+    public void tearDown() {
+        SdkSandboxLocalSingleton.destroySingleton();
+    }
+
+    @Test
+    public void testInitInstanceWithIncorrectType() throws RemoteException {
+        IBinder binder2 = Mockito.mock(IBinder.class);
+        Mockito.when(binder2.getInterfaceDescriptor()).thenReturn("xyz");
+        assertThrows(
+                "IInterface not supported",
+                UnsupportedOperationException.class,
+                () -> SdkSandboxLocalSingleton.initInstance(binder2));
+    }
+
+    @Test
+    public void testInitInstance() {
+        SdkSandboxLocalSingleton.initInstance(mBinder);
+        SdkSandboxLocalSingleton singletonInstance = SdkSandboxLocalSingleton.getExistingInstance();
+        assertThat(singletonInstance).isNotNull();
+        assertThat(singletonInstance.getSdkToServiceCallback().asBinder()).isEqualTo(mBinder);
+    }
+
+    @Test
+    public void testInitInstanceWhenAlreadyExists() {
+        SdkSandboxLocalSingleton.initInstance(mBinder);
+
+        IBinder binder2 = Mockito.mock(IBinder.class);
+        SdkSandboxLocalSingleton.initInstance(binder2);
+
+        // Assert that the callback was not overridden and the new instance was not created.
+        SdkSandboxLocalSingleton singletonInstance = SdkSandboxLocalSingleton.getExistingInstance();
+        assertThat(singletonInstance).isNotNull();
+        assertThat(singletonInstance.getSdkToServiceCallback().asBinder()).isEqualTo(mBinder);
+    }
+
+    @Test
+    public void testGetInstanceReturnsSameObjectAlways() {
+        SdkSandboxLocalSingleton.initInstance(mBinder);
+
+        SdkSandboxLocalSingleton singletonInstance = SdkSandboxLocalSingleton.getExistingInstance();
+        assertThat(singletonInstance).isNotNull();
+        assertThat(SdkSandboxLocalSingleton.getExistingInstance())
+                .isSameInstanceAs(singletonInstance);
+    }
+
+    @Test
+    public void testGetInstanceWhenItDoesNotExist() {
+        assertThrows(
+                "SdkSandboxLocalSingleton not found",
+                IllegalStateException.class,
+                SdkSandboxLocalSingleton::getExistingInstance);
+    }
+}