diff --git a/tests/termios_test.cpp b/tests/termios_test.cpp
new file mode 100644
index 0000000..6290771
--- /dev/null
+++ b/tests/termios_test.cpp
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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
+ * COPYRIGHT OWNER OR CONTRIBUTORS 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 <termios.h>
+
+#include <errno.h>
+
+#include <gtest/gtest.h>
+
+// TODO:
+// tcdrain
+// tcflow
+// tcflush
+// tcgetattr
+// tcgetsid
+// tcsendbreak
+// tcsetattr
+
+TEST(termios, cfgetispeed_cfsetispeed) {
+  termios t = {};
+  ASSERT_EQ(0, cfsetispeed(&t, B1200));
+  ASSERT_EQ(static_cast<speed_t>(B1200), cfgetispeed(&t));
+}
+
+TEST(termios, cfsetispeed_EINVAL) {
+  termios t = {};
+  errno = 0;
+  ASSERT_EQ(-1, cfsetispeed(&t, 1200));
+  ASSERT_EQ(EINVAL, errno);
+}
+
+TEST(termios, cfgetospeed_cfsetospeed) {
+  termios t = {};
+  ASSERT_EQ(0, cfsetospeed(&t, B1200));
+  ASSERT_EQ(static_cast<speed_t>(B1200), cfgetospeed(&t));
+}
+
+TEST(termios, cfsetospeed_EINVAL) {
+  termios t = {};
+  errno = 0;
+  ASSERT_EQ(-1, cfsetospeed(&t, 1200));
+  ASSERT_EQ(EINVAL, errno);
+}
+
+TEST(termios, cfsetspeed) {
+  termios t = {};
+  ASSERT_EQ(0, cfsetspeed(&t, B1200));
+  ASSERT_EQ(static_cast<speed_t>(B1200), cfgetispeed(&t));
+  ASSERT_EQ(static_cast<speed_t>(B1200), cfgetospeed(&t));
+}
+
+TEST(termios, cfsetspeed_EINVAL) {
+  termios t = {};
+  errno = 0;
+  // glibc seems to allow 1200 as well as B1200 here, presumably for
+  // BSD compatibility (where Bxxx == xxx, unlike Linux).
+  ASSERT_EQ(-1, cfsetspeed(&t, 123));
+  ASSERT_EQ(EINVAL, errno);
+}
+
+TEST(termios, cfmakeraw) {
+  termios t;
+  memset(&t, 0xff, sizeof(t));
+  cfmakeraw(&t);
+
+  EXPECT_EQ(0U, (t.c_iflag & (IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON)));
+  EXPECT_EQ(0U, (t.c_oflag & OPOST));
+  EXPECT_EQ(0U, (t.c_lflag & (ECHO|ECHONL|ICANON|ISIG|IEXTEN)));
+  EXPECT_EQ(0U, (t.c_cflag & PARENB));
+  EXPECT_EQ(CS8, static_cast<int>(t.c_cflag & CSIZE));
+  EXPECT_EQ(1, t.c_cc[VMIN]);
+  EXPECT_EQ(0, t.c_cc[VTIME]);
+}