diff --git a/tests/zm_utils.cpp b/tests/zm_utils.cpp
index 887bda45a..1581949ff 100644
--- a/tests/zm_utils.cpp
+++ b/tests/zm_utils.cpp
@@ -144,3 +144,13 @@ TEST_CASE("join") {
   REQUIRE(join({"a", "b"}, ",") == "a,b");
   REQUIRE(join({"a", "b"}, "") == "ab");
 }
+
+TEST_CASE("base64Encode") {
+  REQUIRE(base64Encode("") == "");
+  REQUIRE(base64Encode("f") == "Zg==");
+  REQUIRE(base64Encode("fo") == "Zm8=");
+  REQUIRE(base64Encode("foo") == "Zm9v");
+  REQUIRE(base64Encode("foob") == "Zm9vYg==");
+  REQUIRE(base64Encode("fooba") == "Zm9vYmE=");
+  REQUIRE(base64Encode("foobar") == "Zm9vYmFy");
+}