Add KeyCharacterMapTest unit test

Adds unit test for KeyCharacterMapTest, primarily focusing on test
cases not covered in existing CTS tests.

Bug: None
Test: atest com.android.test.input.KeyCharacterMapTest

Flag: TEST_ONLY

Change-Id: Ie36f8ad505b26a2a1c2741804fcfd31d56649bc2

1 files changed, 55 insertions, 0 deletions

diff --git a/tests/Input/src/com/android/test/input/KeyCharacterMapTest.kt b/tests/Input/src/com/android/test/input/KeyCharacterMapTest.kt
new file mode 100644
index 000000000000..281837920548
--- /dev/null
+++ b/tests/Input/src/com/android/test/input/KeyCharacterMapTest.kt
@@ -0,0 +1,55 @@
+/*
+ * Copyright 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.test.input
+
+import android.view.KeyCharacterMap
+import android.view.KeyEvent
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+/**
+ * Tests for {@link KeyCharacterMap}.
+ *
+ * <p>Build/Install/Run:
+ * atest KeyCharacterMapTest
+ *
+ */
+class KeyCharacterMapTest {
+    @Test
+    fun testGetFallback() {
+        // Based off of VIRTUAL kcm fallbacks.
+        val keyCharacterMap = KeyCharacterMap.load(KeyCharacterMap.VIRTUAL_KEYBOARD)
+
+        // One modifier fallback.
+        assertEquals(
+            keyCharacterMap.getFallbackAction(KeyEvent.KEYCODE_SPACE,
+                KeyEvent.META_CTRL_ON).keyCode,
+            KeyEvent.KEYCODE_LANGUAGE_SWITCH)
+
+        // Multiple modifier fallback.
+        assertEquals(
+            keyCharacterMap.getFallbackAction(KeyEvent.KEYCODE_DEL,
+                KeyEvent.META_CTRL_ON or KeyEvent.META_ALT_ON).keyCode,
+            KeyEvent.KEYCODE_BACK)
+
+        // No default button, fallback only.
+        assertEquals(
+            keyCharacterMap.getFallbackAction(KeyEvent.KEYCODE_BUTTON_A, 0).keyCode,
+            KeyEvent.KEYCODE_DPAD_CENTER)
+    }
+}