cmsdk: Provide coverage for serial number and unique device id.

Tests for unique device id are enforced to be implemented correctly
  on user builds.

Change-Id: I1c6b24bbf68fe1dce645744f8323c869fdeb9ada
TICKET: CYNGNOS-3026

tests/src/org/cyanogenmod/tests/hardware/unit/UniqueDeviceIDTest.java

@@ -0,0 +1,89 @@
+/**
+ * Copyright (c) 2016, The CyanogenMod 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 org.cyanogenmod.tests.hardware.unit;
+
+import android.os.Build;
+import android.os.SystemProperties;
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.SmallTest;
+import android.text.TextUtils;
+
+import cyanogenmod.hardware.CMHardwareManager;
+
+public class UniqueDeviceIDTest extends AndroidTestCase {
+    private static final String TAG = UniqueDeviceIDTest.class.getSimpleName();
+    private static final int MINIMUM_LENGTH = 3;
+    private CMHardwareManager mCMHardwareManager;
+
+    //TODO: Use the TYPE declaration from CMHardwareManager public interface in future
+    private static final int TYPE_MMC0_CID = 0;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        mCMHardwareManager = CMHardwareManager.getInstance(mContext);
+    }
+
+    @SmallTest
+    public void testGetSerialNumber() {
+        final int feature = CMHardwareManager.FEATURE_SERIAL_NUMBER;
+        if (mCMHardwareManager.isSupported(feature)) {
+            String notExpectedSerialNo = SystemProperties.get("ro.serialno");
+            String actualSerialNo = mCMHardwareManager.getSerialNumber();
+            assertNotNull(actualSerialNo);
+            assertNotSame(notExpectedSerialNo, actualSerialNo);
+        }
+    }
+
+    @SmallTest
+    public void testGetUniqueDeviceId() {
+        final int feature = CMHardwareManager.FEATURE_UNIQUE_DEVICE_ID;
+        assertFeatureEnabledOnRetail(feature);
+        if (mCMHardwareManager.isSupported(feature)) {
+            String uniqueDeviceId = mCMHardwareManager.getUniqueDeviceId();
+            //FIXME: This is based off the default implementation in cyngn/hw, make more robust
+            assertNotNull(uniqueDeviceId);
+            assertTrue(uniqueDeviceId.length() >= MINIMUM_LENGTH);
+            assertTrue(isValidHexNumberAndType(uniqueDeviceId.substring(0, 3)));
+        }
+    }
+
+    private void assertFeatureEnabledOnRetail(int feature) {
+        if (TextUtils.equals(Build.TYPE, "user")) {
+            assertTrue(mCMHardwareManager.isSupported(feature));
+        }
+    }
+
+    private static boolean isValidHexNumberAndType(String target) {
+        try {
+            long value = Long.parseLong(target, 16);
+            return isValidType((int) value);
+        }
+        catch (NumberFormatException ex) {
+            return false;
+        }
+    }
+
+    private static boolean isValidType(int value) {
+        switch (value) {
+            case TYPE_MMC0_CID:
+                return true;
+            default:
+                return false;
+        }
+    }
+}