diff --git a/libs/nativewindow/tests/AHardwareBufferTest.cpp b/libs/nativewindow/tests/AHardwareBufferTest.cpp
new file mode 100644
index 0000000..1099043
--- /dev/null
+++ b/libs/nativewindow/tests/AHardwareBufferTest.cpp
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#define LOG_TAG "AHardwareBuffer_test"
+//#define LOG_NDEBUG 0
+
+#include <android/hardware_buffer.h>
+#include <private/android/AHardwareBufferHelpers.h>
+#include <hardware/gralloc1.h>
+
+#include <gtest/gtest.h>
+
+using namespace android;
+
+static ::testing::AssertionResult BuildHexFailureMessage(uint64_t expected,
+        uint64_t actual, const char* type) {
+    std::ostringstream ss;
+    ss << type << " 0x" << std::hex << actual
+            << " does not match expected " << type << " 0x" << std::hex
+            << expected;
+    return ::testing::AssertionFailure() << ss.str();
+}
+
+static ::testing::AssertionResult TestUsageConversion(
+        uint64_t grallocProducerUsage, uint64_t grallocConsumerUsage,
+        uint64_t hardwareBufferUsage0, uint64_t hardwareBufferUsage1) {
+    uint64_t producerUsage = 0;
+    uint64_t consumerUsage = 0;
+    uint64_t usage0 = 0;
+    uint64_t usage1 = 0;
+
+    AHardwareBuffer_convertToGrallocUsageBits(
+            &producerUsage, &consumerUsage, hardwareBufferUsage0, hardwareBufferUsage1);
+    if (producerUsage != grallocProducerUsage)
+        return BuildHexFailureMessage(grallocProducerUsage, producerUsage,
+                "producer");
+    if (consumerUsage != grallocConsumerUsage)
+        return BuildHexFailureMessage(grallocConsumerUsage, consumerUsage,
+                "consumer");
+
+    AHardwareBuffer_convertFromGrallocUsageBits(
+            &usage0, &usage1, grallocProducerUsage, grallocConsumerUsage);
+    if (usage0 != hardwareBufferUsage0)
+        return BuildHexFailureMessage(hardwareBufferUsage0, usage0, "usage0");
+    if (usage1 != hardwareBufferUsage1)
+        return BuildHexFailureMessage(hardwareBufferUsage1, usage1, "usage1");
+
+    return testing::AssertionSuccess();
+}
+
+// This is a unit test rather than going through AHardwareBuffer because not
+// all flags may be supported by the host device.
+TEST(AHardwareBufferTest, ConvertToAndFromGrallocBits) {
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_CPU_READ,
+            AHARDWAREBUFFER_USAGE0_CPU_READ, 0));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_CPU_READ_OFTEN,
+            AHARDWAREBUFFER_USAGE0_CPU_READ_OFTEN, 0));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_CPU_WRITE, 0,
+            AHARDWAREBUFFER_USAGE0_CPU_WRITE, 0));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_CPU_WRITE_OFTEN, 0,
+            AHARDWAREBUFFER_USAGE0_CPU_WRITE_OFTEN, 0));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_GPU_TEXTURE,
+            AHARDWAREBUFFER_USAGE0_GPU_SAMPLED_IMAGE, 0));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_GPU_RENDER_TARGET,
+            0, AHARDWAREBUFFER_USAGE0_GPU_COLOR_OUTPUT, 0));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_GPU_DATA_BUFFER,
+            AHARDWAREBUFFER_USAGE0_GPU_DATA_BUFFER, 0));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PROTECTED, 0,
+            AHARDWAREBUFFER_USAGE0_PROTECTED_CONTENT, 0));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_SENSOR_DIRECT_DATA,
+            0, AHARDWAREBUFFER_USAGE0_SENSOR_DIRECT_DATA, 0));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_VIDEO_ENCODER,
+            AHARDWAREBUFFER_USAGE0_VIDEO_ENCODE, 0));
+
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_0, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_0));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_1, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_1));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_2, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_2));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_3, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_3));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_4, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_4));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_5, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_5));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_6, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_6));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_7, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_7));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_8, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_8));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_9, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_9));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_10, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_10));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_11, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_11));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_12, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_12));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_13, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_13));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_14, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_14));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_15, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_15));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_16, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_16));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_17, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_17));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_18, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_18));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_PRIVATE_19, 0,
+            0, AHARDWAREBUFFER_USAGE1_PRODUCER_PRIVATE_19));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_0,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_0));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_1,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_1));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_2,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_2));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_3,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_3));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_4,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_4));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_5,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_5));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_6,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_6));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_7,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_7));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_8,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_8));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_9,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_9));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_10,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_10));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_11,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_11));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_12,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_12));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_13,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_13));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_14,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_14));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_15,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_15));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_16,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_16));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_17,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_17));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_18,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_18));
+    EXPECT_TRUE(TestUsageConversion(0, GRALLOC1_CONSUMER_USAGE_PRIVATE_19,
+            0, AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_19));
+
+    // Test some more complex flag combinations.
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_CPU_WRITE,
+            GRALLOC1_CONSUMER_USAGE_CPU_READ,
+            AHARDWAREBUFFER_USAGE0_CPU_READ | AHARDWAREBUFFER_USAGE0_CPU_WRITE,
+            0));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_CPU_WRITE_OFTEN, 0,
+            AHARDWAREBUFFER_USAGE0_CPU_WRITE_OFTEN, 0));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_GPU_RENDER_TARGET,
+            GRALLOC1_CONSUMER_USAGE_GPU_TEXTURE |
+                    GRALLOC1_CONSUMER_USAGE_PRIVATE_17,
+            AHARDWAREBUFFER_USAGE0_GPU_COLOR_OUTPUT |
+                    AHARDWAREBUFFER_USAGE0_GPU_SAMPLED_IMAGE,
+            AHARDWAREBUFFER_USAGE1_CONSUMER_PRIVATE_17));
+    EXPECT_TRUE(TestUsageConversion(GRALLOC1_PRODUCER_USAGE_SENSOR_DIRECT_DATA,
+            GRALLOC1_CONSUMER_USAGE_GPU_DATA_BUFFER,
+            AHARDWAREBUFFER_USAGE0_GPU_DATA_BUFFER |
+                    AHARDWAREBUFFER_USAGE0_SENSOR_DIRECT_DATA, 0));
+}
diff --git a/libs/nativewindow/tests/Android.bp b/libs/nativewindow/tests/Android.bp
new file mode 100644
index 0000000..437ab75
--- /dev/null
+++ b/libs/nativewindow/tests/Android.bp
@@ -0,0 +1,21 @@
+//
+// Copyright (C) 2017 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.
+//
+
+cc_test {
+    name: "AHardwareBufferTest",
+    shared_libs: ["libnativewindow"],
+    srcs: ["AHardwareBufferTest.cpp"],
+}