Add a CTS for KeyguardManagerHelper APIs

Added the testIsKeyguardLocked CTS test case for the car builtin
KeyguardManagerHelper APIS.

Bug: 194970538
Test: atest CtsCarBuiltinApiTestCases:KeyguardManagerHelperTest
Change-Id: I94369eb60fab481fd18285c429c32d154e528ceb
diff --git a/tests/tests/car_builtin/src/android/car/cts/builtin/app/KeyguardManagerHelperTest.java b/tests/tests/car_builtin/src/android/car/cts/builtin/app/KeyguardManagerHelperTest.java
new file mode 100644
index 0000000..6cc2071
--- /dev/null
+++ b/tests/tests/car_builtin/src/android/car/cts/builtin/app/KeyguardManagerHelperTest.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2021 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.car.cts.builtin.app;
+
+import static android.server.wm.UiDeviceUtils.pressUnlockButton;
+import static android.view.Display.DEFAULT_DISPLAY;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assume.assumeTrue;
+
+import android.car.builtin.app.KeyguardManagerHelper;
+import android.server.wm.ActivityManagerTestBase;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public final class KeyguardManagerHelperTest extends ActivityManagerTestBase {
+
+    private static final String TAG = KeyguardManagerHelperTest.class.getSimpleName();
+
+    @Before
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+        assumeTrue(supportsSecureLock());
+    }
+
+    @Test
+    public void testIsKeyguardLocked() throws Exception {
+        try (LockScreenSession lockScreenSession = createManagedLockScreenSession()) {
+            lockScreenSession.setLockCredential().gotoKeyguard();
+            assertThat(KeyguardManagerHelper.isKeyguardLocked()).isTrue();
+
+            unlockDevice();
+            lockScreenSession.enterAndConfirmLockCredential();
+            mWmState.waitAndAssertKeyguardGone();
+            assertThat(KeyguardManagerHelper.isKeyguardLocked()).isFalse();
+        }
+    }
+
+    private void unlockDevice() {
+        touchAndCancelOnDisplayCenterSync(DEFAULT_DISPLAY);
+        pressUnlockButton();
+    }
+}