diff --git a/nearby/service/java/com/android/server/nearby/common/bluetooth/testability/Testability.java b/nearby/service/java/com/android/server/nearby/common/bluetooth/testability/Testability.java
new file mode 100644
index 0000000..6cfdd78
--- /dev/null
+++ b/nearby/service/java/com/android/server/nearby/common/bluetooth/testability/Testability.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 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 com.android.server.nearby.common.bluetooth.testability;
+
+import com.android.server.nearby.common.bluetooth.testability.android.bluetooth.BluetoothAdapter;
+import com.android.server.nearby.common.bluetooth.testability.android.bluetooth.BluetoothDevice;
+
+import javax.annotation.Nullable;
+
+/** Util class to convert from or to testable classes. */
+public class Testability {
+    /** Wraps a Bluetooth device. */
+    public static BluetoothDevice wrap(android.bluetooth.BluetoothDevice bluetoothDevice) {
+        return BluetoothDevice.wrap(bluetoothDevice);
+    }
+
+    /** Wraps a Bluetooth adapter. */
+    @Nullable
+    public static BluetoothAdapter wrap(
+            @Nullable android.bluetooth.BluetoothAdapter bluetoothAdapter) {
+        return BluetoothAdapter.wrap(bluetoothAdapter);
+    }
+}
diff --git a/nearby/service/java/com/android/server/nearby/common/bluetooth/testability/android/bluetooth/BluetoothAdapter.java b/nearby/service/java/com/android/server/nearby/common/bluetooth/testability/android/bluetooth/BluetoothAdapter.java
new file mode 100644
index 0000000..afa2a1b
--- /dev/null
+++ b/nearby/service/java/com/android/server/nearby/common/bluetooth/testability/android/bluetooth/BluetoothAdapter.java
@@ -0,0 +1,166 @@
+/*
+ * Copyright 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 com.android.server.nearby.common.bluetooth.testability.android.bluetooth;
+
+import android.annotation.TargetApi;
+import android.os.Build;
+
+import com.android.server.nearby.common.bluetooth.testability.android.bluetooth.le.BluetoothLeAdvertiser;
+import com.android.server.nearby.common.bluetooth.testability.android.bluetooth.le.BluetoothLeScanner;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+import javax.annotation.Nullable;
+
+/**
+ * Mockable wrapper of {@link android.bluetooth.BluetoothAdapter}.
+ */
+public class BluetoothAdapter {
+    /** See {@link android.bluetooth.BluetoothAdapter#ACTION_REQUEST_ENABLE}. */
+    public static final String ACTION_REQUEST_ENABLE =
+            android.bluetooth.BluetoothAdapter.ACTION_REQUEST_ENABLE;
+
+    /** See {@link android.bluetooth.BluetoothAdapter#ACTION_STATE_CHANGED}. */
+    public static final String ACTION_STATE_CHANGED =
+            android.bluetooth.BluetoothAdapter.ACTION_STATE_CHANGED;
+
+    /** See {@link android.bluetooth.BluetoothAdapter#EXTRA_STATE}. */
+    public static final String EXTRA_STATE =
+            android.bluetooth.BluetoothAdapter.EXTRA_STATE;
+
+    /** See {@link android.bluetooth.BluetoothAdapter#STATE_OFF}. */
+    public static final int STATE_OFF =
+            android.bluetooth.BluetoothAdapter.STATE_OFF;
+
+    /** See {@link android.bluetooth.BluetoothAdapter#STATE_ON}. */
+    public static final int STATE_ON =
+            android.bluetooth.BluetoothAdapter.STATE_ON;
+
+    /** See {@link android.bluetooth.BluetoothAdapter#STATE_TURNING_OFF}. */
+    public static final int STATE_TURNING_OFF =
+            android.bluetooth.BluetoothAdapter.STATE_TURNING_OFF;
+
+    /** See {@link android.bluetooth.BluetoothAdapter#STATE_TURNING_ON}. */
+    public static final int STATE_TURNING_ON =
+            android.bluetooth.BluetoothAdapter.STATE_TURNING_ON;
+
+    private final android.bluetooth.BluetoothAdapter mWrappedBluetoothAdapter;
+
+    private BluetoothAdapter(android.bluetooth.BluetoothAdapter bluetoothAdapter) {
+        mWrappedBluetoothAdapter = bluetoothAdapter;
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#disable()}. */
+    public boolean disable() {
+        return mWrappedBluetoothAdapter.disable();
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#enable()}. */
+    public boolean enable() {
+        return mWrappedBluetoothAdapter.enable();
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#getBluetoothLeScanner}. */
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    @Nullable
+    public BluetoothLeScanner getBluetoothLeScanner() {
+        return BluetoothLeScanner.wrap(mWrappedBluetoothAdapter.getBluetoothLeScanner());
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#getBluetoothLeAdvertiser()}. */
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    @Nullable
+    public BluetoothLeAdvertiser getBluetoothLeAdvertiser() {
+        return BluetoothLeAdvertiser.wrap(mWrappedBluetoothAdapter.getBluetoothLeAdvertiser());
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#getBondedDevices()}. */
+    @Nullable
+    public Set<BluetoothDevice> getBondedDevices() {
+        Set<android.bluetooth.BluetoothDevice> bondedDevices =
+                mWrappedBluetoothAdapter.getBondedDevices();
+        if (bondedDevices == null) {
+            return null;
+        }
+        Set<BluetoothDevice> result = new HashSet<BluetoothDevice>();
+        for (android.bluetooth.BluetoothDevice device : bondedDevices) {
+            if (device == null) {
+                continue;
+            }
+            result.add(BluetoothDevice.wrap(device));
+        }
+        return Collections.unmodifiableSet(result);
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#getRemoteDevice(byte[])}. */
+    public BluetoothDevice getRemoteDevice(byte[] address) {
+        return BluetoothDevice.wrap(mWrappedBluetoothAdapter.getRemoteDevice(address));
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#getRemoteDevice(String)}. */
+    public BluetoothDevice getRemoteDevice(String address) {
+        return BluetoothDevice.wrap(mWrappedBluetoothAdapter.getRemoteDevice(address));
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#isEnabled()}. */
+    public boolean isEnabled() {
+        return mWrappedBluetoothAdapter.isEnabled();
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#isDiscovering()}. */
+    public boolean isDiscovering() {
+        return mWrappedBluetoothAdapter.isDiscovering();
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#startDiscovery()}. */
+    public boolean startDiscovery() {
+        return mWrappedBluetoothAdapter.startDiscovery();
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#cancelDiscovery()}. */
+    public boolean cancelDiscovery() {
+        return mWrappedBluetoothAdapter.cancelDiscovery();
+    }
+
+    /** See {@link android.bluetooth.BluetoothAdapter#getDefaultAdapter()}. */
+    @Nullable
+    public static BluetoothAdapter getDefaultAdapter() {
+        android.bluetooth.BluetoothAdapter adapter =
+                android.bluetooth.BluetoothAdapter.getDefaultAdapter();
+        if (adapter == null) {
+            return null;
+        }
+        return new BluetoothAdapter(adapter);
+    }
+
+    /** Wraps a Bluetooth adapter. */
+    @Nullable
+    public static BluetoothAdapter wrap(
+            @Nullable android.bluetooth.BluetoothAdapter bluetoothAdapter) {
+        if (bluetoothAdapter == null) {
+            return null;
+        }
+        return new BluetoothAdapter(bluetoothAdapter);
+    }
+
+    /** Unwraps a Bluetooth adapter. */
+    public android.bluetooth.BluetoothAdapter unwrap() {
+        return mWrappedBluetoothAdapter;
+    }
+}