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diff --git a/tests/src/pcm_in_test.cc b/tests/src/pcm_in_test.cc
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+/* pcm_in_test.c
+**
+** Copyright 2020, The Android Open Source Project
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are met:
+**     * Redistributions of source code must retain the above copyright
+**       notice, this list of conditions and the following disclaimer.
+**     * Redistributions in binary form must reproduce the above copyright
+**       notice, this list of conditions and the following disclaimer in the
+**       documentation and/or other materials provided with the distribution.
+**     * Neither the name of The Android Open Source Project nor the names of
+**       its contributors may be used to endorse or promote products derived
+**       from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
+** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
+** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+** DAMAGE.
+*/
+#include "pcm_test_device.h"
+
+#include <chrono>
+#include <cstring>
+#include <iostream>
+
+#include <gtest/gtest.h>
+
+#include "tinyalsa/pcm.h"
+
+namespace tinyalsa {
+namespace testing {
+
+class PcmInTest : public ::testing::Test {
+  protected:
+    PcmInTest() : pcm_object(nullptr) {}
+    virtual ~PcmInTest() = default;
+
+    virtual void SetUp() override {
+        pcm_object = pcm_open(kLoopbackCard, kLoopbackCaptureDevice, PCM_IN, &kDefaultConfig);
+        ASSERT_NE(pcm_object, nullptr);
+        ASSERT_TRUE(pcm_is_ready(pcm_object));
+    }
+
+    virtual void TearDown() override {
+        ASSERT_EQ(pcm_close(pcm_object), 0);
+    }
+
+    static constexpr unsigned int kDefaultChannels = 2;
+    static constexpr unsigned int kDefaultSamplingRate = 48000;
+    static constexpr unsigned int kDefaultPeriodSize = 1024;
+    static constexpr unsigned int kDefaultPeriodCount = 3;
+    static constexpr pcm_config kDefaultConfig = {
+        .channels = kDefaultChannels,
+        .rate = kDefaultSamplingRate,
+        .period_size = kDefaultPeriodSize,
+        .period_count = kDefaultPeriodCount,
+        .format = PCM_FORMAT_S16_LE,
+        .start_threshold = 0,
+        .stop_threshold = 0,
+        .silence_threshold = 0,
+        .silence_size = 0,
+    };
+
+    pcm* pcm_object;
+};
+
+TEST_F(PcmInTest, GetDelay) {
+    long delay = pcm_get_delay(pcm_object);
+    std::cout << delay << std::endl;
+    ASSERT_GE(delay, 0);
+}
+
+TEST_F(PcmInTest, Readi) {
+    constexpr uint32_t read_count = 20;
+
+    size_t buffer_size = pcm_frames_to_bytes(pcm_object, kDefaultConfig.period_size);
+    auto buffer = std::make_unique<char[]>(buffer_size);
+
+    int read_frames = 0;
+    unsigned int frames = pcm_bytes_to_frames(pcm_object, buffer_size);
+    auto start = std::chrono::steady_clock::now();
+    for (uint32_t i = 0; i < read_count; ++i) {
+        read_frames = pcm_readi(pcm_object, buffer.get(), frames);
+        ASSERT_EQ(read_frames, frames);
+    }
+
+    std::chrono::duration<double> difference = std::chrono::steady_clock::now() - start;
+    std::chrono::milliseconds expected_elapsed_time_ms(frames * read_count /
+            (kDefaultConfig.rate / 1000));
+
+    std::cout << difference.count() << std::endl;
+    std::cout << expected_elapsed_time_ms.count() << std::endl;
+
+    ASSERT_NEAR(difference.count() * 1000, expected_elapsed_time_ms.count(), 100);
+}
+
+TEST_F(PcmInTest, Writei) {
+    size_t buffer_size = pcm_frames_to_bytes(pcm_object, kDefaultConfig.period_size);
+    auto buffer = std::make_unique<char[]>(buffer_size);
+
+    unsigned int frames = pcm_bytes_to_frames(pcm_object, buffer_size);
+    ASSERT_EQ(pcm_writei(pcm_object, buffer.get(), frames), -EINVAL);
+}
+
+} // namespace testing
+} // namespace tinyalsa