diff --git a/tests/component/verifier_test.cpp b/tests/component/verifier_test.cpp
index 460585d..07a8c96 100644
--- a/tests/component/verifier_test.cpp
+++ b/tests/component/verifier_test.cpp
@@ -58,6 +58,63 @@
 class VerifierFailureTest : public VerifierTest {
 };
 
+TEST(VerifierTest, load_keys_multiple_keys) {
+  std::string testkey_v4;
+  ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("testkey_v4.txt"), &testkey_v4));
+
+  std::string testkey_v3;
+  ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("testkey_v3.txt"), &testkey_v3));
+
+  std::string keys = testkey_v4 + "," + testkey_v3 + "," + testkey_v4;
+  TemporaryFile key_file1;
+  ASSERT_TRUE(android::base::WriteStringToFile(keys, key_file1.path));
+  std::vector<Certificate> certs;
+  ASSERT_TRUE(load_keys(key_file1.path, certs));
+  ASSERT_EQ(3U, certs.size());
+}
+
+TEST(VerifierTest, load_keys_invalid_keys) {
+  std::vector<Certificate> certs;
+  ASSERT_FALSE(load_keys("/doesntexist", certs));
+
+  // Empty file.
+  TemporaryFile key_file1;
+  ASSERT_FALSE(load_keys(key_file1.path, certs));
+
+  // Invalid contents.
+  ASSERT_TRUE(android::base::WriteStringToFile("invalid", key_file1.path));
+  ASSERT_FALSE(load_keys(key_file1.path, certs));
+
+  std::string testkey_v4;
+  ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("testkey_v4.txt"), &testkey_v4));
+
+  // Invalid key version: "v4 ..." => "v6 ...".
+  std::string invalid_key2(testkey_v4);
+  invalid_key2[1] = '6';
+  TemporaryFile key_file2;
+  ASSERT_TRUE(android::base::WriteStringToFile(invalid_key2, key_file2.path));
+  ASSERT_FALSE(load_keys(key_file2.path, certs));
+
+  // Invalid key content: inserted extra bytes ",2209831334".
+  std::string invalid_key3(testkey_v4);
+  invalid_key3.insert(invalid_key2.size() - 2, ",2209831334");
+  TemporaryFile key_file3;
+  ASSERT_TRUE(android::base::WriteStringToFile(invalid_key3, key_file3.path));
+  ASSERT_FALSE(load_keys(key_file3.path, certs));
+
+  // Invalid key: the last key must not end with an extra ','.
+  std::string invalid_key4 = testkey_v4 + ",";
+  TemporaryFile key_file4;
+  ASSERT_TRUE(android::base::WriteStringToFile(invalid_key4, key_file4.path));
+  ASSERT_FALSE(load_keys(key_file4.path, certs));
+
+  // Invalid key separator.
+  std::string invalid_key5 = testkey_v4 + ";" + testkey_v4;
+  TemporaryFile key_file5;
+  ASSERT_TRUE(android::base::WriteStringToFile(invalid_key5, key_file5.path));
+  ASSERT_FALSE(load_keys(key_file5.path, certs));
+}
+
 TEST_P(VerifierSuccessTest, VerifySucceed) {
   ASSERT_EQ(verify_file(memmap.addr, memmap.length, certs, nullptr), VERIFY_SUCCESS);
 }