Instrumented unit test setup for Rotary

Bug: 170231657
Test: atest com.android.car.rotary.UtilsTest
Change-Id: I0c71cfeec1e6167d9b6d6aa9287b7013037ea724
diff --git a/tests/unit/Android.bp b/tests/unit/Android.bp
new file mode 100644
index 0000000..d41367f
--- /dev/null
+++ b/tests/unit/Android.bp
@@ -0,0 +1,26 @@
+android_test {
+    name: "CarRotaryControllerUnitTests",
+
+    certificate: "platform",
+
+    srcs: ["src/**/*.java"],
+
+    libs: [
+        "android.test.runner",
+        "android.test.base",
+    ],
+
+    static_libs: [
+        "android.car",
+        "androidx.test.core",
+        "androidx.test.rules",
+        "androidx.test.ext.junit",
+        "androidx.test.ext.truth",
+        "mockito-target-minus-junit4",
+        "platform-test-annotations",
+        "truth-prebuilt",
+        "testng",
+    ],
+
+    instrumentation_for: "CarRotaryController",
+}
\ No newline at end of file
diff --git a/tests/unit/AndroidManifest.xml b/tests/unit/AndroidManifest.xml
new file mode 100644
index 0000000..3e23477
--- /dev/null
+++ b/tests/unit/AndroidManifest.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2020 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.
+  -->
+
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
+    package="com.android.car.rotary.tests.unit">
+
+    <application android:debuggable="true">
+        <uses-library android:name="android.test.runner" />
+    </application>
+
+    <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
+                     android:targetPackage="com.android.car.rotary"
+                     android:label="Car Rotary Unit Tests" />
+</manifest>
diff --git a/tests/unit/src/com/android/car/rotary/UtilsTest.java b/tests/unit/src/com/android/car/rotary/UtilsTest.java
new file mode 100644
index 0000000..e688350
--- /dev/null
+++ b/tests/unit/src/com/android/car/rotary/UtilsTest.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2020 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.car.rotary;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.view.accessibility.AccessibilityNodeInfo;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class UtilsTest {
+
+    @Test
+    public void refreshNode_nodeIsNull_returnsNull() {
+        AccessibilityNodeInfo result = Utils.refreshNode(null);
+
+        assertThat(result).isNull();
+    }
+
+    @Test
+    public void refreshNode_nodeRefreshed_returnsNode() {
+        AccessibilityNodeInfo input = mock(AccessibilityNodeInfo.class);
+        when(input.refresh()).thenReturn(true);
+
+        AccessibilityNodeInfo result = Utils.refreshNode(input);
+
+        assertThat(result).isNotNull();
+    }
+
+    @Test
+    public void refreshNode_nodeNotRefreshed_returnsNull() {
+        AccessibilityNodeInfo input = mock(AccessibilityNodeInfo.class);
+        when(input.refresh()).thenReturn(false);
+
+        AccessibilityNodeInfo result = Utils.refreshNode(input);
+
+        assertThat(result).isNull();
+    }
+
+    @Test
+    public void refreshNode_nodeNotRefreshed_recycleNode() {
+        AccessibilityNodeInfo input = mock(AccessibilityNodeInfo.class);
+        when(input.refresh()).thenReturn(false);
+
+        Utils.refreshNode(input);
+
+        verify(input).recycle();
+    }
+}