Add a unit test for EditorInfo#targetInputMethodUser

This it a follow up CL to my previous CL [1], which introduced
EditorInfo#targetInputMethodUser.

Since EditorInfo#targetInputMethodUser is an @hide API, we cannot
directly its behavior in CTS.  To make sure that it can be transferred
via IPCs , this CL introduces a simple unit test for it in
FrameworksCoreTests.

 [1]: Ia7ea944438d69669ccdf9111b34ba400e786a602
      0f5eade4a492fc91130da1aedcad0999932f4137

Bug: 120744418
Test: atest FrameworksCoreTests:EditorInfoTest
Change-Id: I3e722b3ccbd2ff33c264d4d41aa63e704970e78d

1 files changed, 74 insertions, 0 deletions

diff --git a/core/tests/coretests/src/android/view/inputmethod/EditorInfoTest.java b/core/tests/coretests/src/android/view/inputmethod/EditorInfoTest.java
new file mode 100644
index 000000000000..68099fe19d13
--- /dev/null
+++ b/core/tests/coretests/src/android/view/inputmethod/EditorInfoTest.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2019 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.view.inputmethod;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import android.os.Parcel;
+import android.os.UserHandle;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Supplemental tests that cannot be covered by CTS (e.g. due to hidden API dependencies).
+ */
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class EditorInfoTest {
+    private static final int TEST_USER_ID = 42;
+
+    /**
+     * Makes sure that {@code null} {@link EditorInfo#targetInputMethodUser} can be copied via
+     * {@link Parcel}.
+     */
+    @Test
+    public void testNullTargetInputMethodUserParcelable() throws Exception {
+        final EditorInfo editorInfo = new EditorInfo();
+        editorInfo.targetInputMethodUser = null;
+        assertNull(cloneViaParcel(editorInfo).targetInputMethodUser);
+    }
+
+    /**
+     * Makes sure that non-{@code null} {@link EditorInfo#targetInputMethodUser} can be copied via
+     * {@link Parcel}.
+     */
+    @Test
+    public void testNonNullTargetInputMethodUserParcelable() throws Exception {
+        final EditorInfo editorInfo = new EditorInfo();
+        editorInfo.targetInputMethodUser = UserHandle.of(TEST_USER_ID);
+        assertEquals(UserHandle.of(TEST_USER_ID), cloneViaParcel(editorInfo).targetInputMethodUser);
+    }
+
+    private static EditorInfo cloneViaParcel(EditorInfo original) {
+        Parcel parcel = null;
+        try {
+            parcel = Parcel.obtain();
+            original.writeToParcel(parcel, 0);
+            parcel.setDataPosition(0);
+            return EditorInfo.CREATOR.createFromParcel(parcel);
+        } finally {
+            if (parcel != null) {
+                parcel.recycle();
+            }
+        }
+    }
+}