diff --git a/tests/base64_test.cpp b/tests/base64_test.cpp
new file mode 100644
index 0000000..b762b8e
--- /dev/null
+++ b/tests/base64_test.cpp
@@ -0,0 +1,26 @@
+extern "C" {
+#include "base64.h"
+}
+
+#include "gtest/gtest.h"
+#include "gmock/gmock.h"
+
+TEST(Base64Encode, Good)
+{
+	int32_t encoded_len = 0;
+	std::array<uint8_t, 1> data = { 'f' };
+	char *encoded = base64_encode(data.data(), data.size(), &encoded_len);
+	EXPECT_EQ(encoded_len, 4);
+	ASSERT_EQ(std::string_view(encoded, encoded_len), "Zg==");
+	free(encoded);
+}
+
+TEST(Base64Decode, Good)
+{
+	int32_t decoded_len = 0;
+	std::string_view data{ "Zg==" };
+	UINT8 *decoded = base64_decode(data.data(), data.size(), &decoded_len);
+	EXPECT_EQ(decoded_len, 1);
+	ASSERT_EQ(decoded[0], 'f');
+	free(decoded);
+}