diff --git a/tests/Android.mk b/tests/Android.mk
index 1621f37..8ae52d7 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -61,6 +61,7 @@
 LOCAL_C_INCLUDES := bootable/recovery
 LOCAL_SRC_FILES := \
     component/applypatch_test.cpp \
+    component/bootloader_message_test.cpp \
     component/edify_test.cpp \
     component/uncrypt_test.cpp \
     component/updater_test.cpp \
diff --git a/tests/component/bootloader_message_test.cpp b/tests/component/bootloader_message_test.cpp
new file mode 100644
index 0000000..cff129c
--- /dev/null
+++ b/tests/component/bootloader_message_test.cpp
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#include <android-base/strings.h>
+#include <bootloader_message/bootloader_message.h>
+#include <gtest/gtest.h>
+
+#include <string>
+#include <vector>
+
+class BootloaderMessageTest : public ::testing::Test {
+ protected:
+  virtual void TearDown() override {
+    // Clear the BCB.
+    std::string err;
+    ASSERT_TRUE(clear_bootloader_message(&err)) << "Failed to clear BCB: " << err;
+  }
+};
+
+TEST_F(BootloaderMessageTest, clear_bootloader_message) {
+  // Clear the BCB.
+  std::string err;
+  ASSERT_TRUE(clear_bootloader_message(&err)) << "Failed to clear BCB: " << err;
+
+  // Verify the content.
+  bootloader_message boot;
+  ASSERT_TRUE(read_bootloader_message(&boot, &err)) << "Failed to read BCB: " << err;
+
+  // All the bytes should be cleared.
+  ASSERT_EQ(std::string(sizeof(boot), '\0'),
+            std::string(reinterpret_cast<const char*>(&boot), sizeof(boot)));
+}
+
+TEST_F(BootloaderMessageTest, read_and_write_bootloader_message) {
+  // Write the BCB.
+  bootloader_message boot = {};
+  strlcpy(boot.command, "command", sizeof(boot.command));
+  strlcpy(boot.recovery, "message1\nmessage2\n", sizeof(boot.recovery));
+  strlcpy(boot.status, "status1", sizeof(boot.status));
+
+  std::string err;
+  ASSERT_TRUE(write_bootloader_message(boot, &err)) << "Failed to write BCB: " << err;
+
+  // Read and verify.
+  bootloader_message boot_verify;
+  ASSERT_TRUE(read_bootloader_message(&boot_verify, &err)) << "Failed to read BCB: " << err;
+
+  ASSERT_EQ(std::string(reinterpret_cast<const char*>(&boot), sizeof(boot)),
+            std::string(reinterpret_cast<const char*>(&boot_verify), sizeof(boot_verify)));
+}
+
+TEST_F(BootloaderMessageTest, write_bootloader_message_options) {
+  // Write the options to BCB.
+  std::vector<std::string> options = { "option1", "option2" };
+  std::string err;
+  ASSERT_TRUE(write_bootloader_message(options, &err)) << "Failed to write BCB: " << err;
+
+  // Inject some bytes into boot, which should be overwritten while reading.
+  bootloader_message boot;
+  strlcpy(boot.recovery, "random message", sizeof(boot.recovery));
+  strlcpy(boot.reserved, "reserved bytes", sizeof(boot.reserved));
+
+  ASSERT_TRUE(read_bootloader_message(&boot, &err)) << "Failed to read BCB: " << err;
+
+  // Verify that command and recovery fields should be set.
+  ASSERT_EQ("boot-recovery", std::string(boot.command));
+  std::string expected = "recovery\n" + android::base::Join(options, "\n") + "\n";
+  ASSERT_EQ(expected, std::string(boot.recovery));
+
+  // The rest should be cleared.
+  ASSERT_EQ(std::string(sizeof(boot.status), '\0'), std::string(boot.status, sizeof(boot.status)));
+  ASSERT_EQ(std::string(sizeof(boot.stage), '\0'), std::string(boot.stage, sizeof(boot.stage)));
+  ASSERT_EQ(std::string(sizeof(boot.reserved), '\0'),
+            std::string(boot.reserved, sizeof(boot.reserved)));
+}
+
+TEST_F(BootloaderMessageTest, write_bootloader_message_options_empty) {
+  // Write empty vector.
+  std::vector<std::string> options;
+  std::string err;
+  ASSERT_TRUE(write_bootloader_message(options, &err)) << "Failed to write BCB: " << err;
+
+  // Read and verify.
+  bootloader_message boot;
+  ASSERT_TRUE(read_bootloader_message(&boot, &err)) << "Failed to read BCB: " << err;
+
+  // command and recovery fields should be set.
+  ASSERT_EQ("boot-recovery", std::string(boot.command));
+  ASSERT_EQ("recovery\n", std::string(boot.recovery));
+
+  // The rest should be cleared.
+  ASSERT_EQ(std::string(sizeof(boot.status), '\0'), std::string(boot.status, sizeof(boot.status)));
+  ASSERT_EQ(std::string(sizeof(boot.stage), '\0'), std::string(boot.stage, sizeof(boot.stage)));
+  ASSERT_EQ(std::string(sizeof(boot.reserved), '\0'),
+            std::string(boot.reserved, sizeof(boot.reserved)));
+}
+
+TEST_F(BootloaderMessageTest, write_bootloader_message_options_long) {
+  // Write super long message.
+  std::vector<std::string> options;
+  for (int i = 0; i < 100; i++) {
+    options.push_back("option: " + std::to_string(i));
+  }
+
+  std::string err;
+  ASSERT_TRUE(write_bootloader_message(options, &err)) << "Failed to write BCB: " << err;
+
+  // Read and verify.
+  bootloader_message boot;
+  ASSERT_TRUE(read_bootloader_message(&boot, &err)) << "Failed to read BCB: " << err;
+
+  // Make sure it's long enough.
+  std::string expected = "recovery\n" + android::base::Join(options, "\n") + "\n";
+  ASSERT_GE(expected.size(), sizeof(boot.recovery));
+
+  // command and recovery fields should be set.
+  ASSERT_EQ("boot-recovery", std::string(boot.command));
+  ASSERT_EQ(expected.substr(0, sizeof(boot.recovery) - 1), std::string(boot.recovery));
+  ASSERT_EQ('\0', boot.recovery[sizeof(boot.recovery) - 1]);
+
+  // The rest should be cleared.
+  ASSERT_EQ(std::string(sizeof(boot.status), '\0'), std::string(boot.status, sizeof(boot.status)));
+  ASSERT_EQ(std::string(sizeof(boot.stage), '\0'), std::string(boot.stage, sizeof(boot.stage)));
+  ASSERT_EQ(std::string(sizeof(boot.reserved), '\0'),
+            std::string(boot.reserved, sizeof(boot.reserved)));
+}