diff --git a/src/util.zig b/src/util.zig
index b41cfe6..ee3f79e 100644
--- a/src/util.zig
+++ b/src/util.zig
@@ -88,6 +88,44 @@ pub const Uuid = struct {
     }
 };
 
+test "parse uuid" {
+    try std.testing.expectEqual(
+        Uuid.Nil,
+        try Uuid.parse("00000000-0000-0000-0000-000000000000"),
+    );
+
+    try std.testing.expectEqual(
+        Uuid{
+            .data = @bitCast([16]u8, @as(u128, 0x4ba7b74522ad_1da8_c242_d312_60515ff7)),
+        },
+        try Uuid.parse("f75f5160-12d3-42c2-a81d-ad2245b7a74b"),
+    );
+}
+
+test "format uuid" {
+    var buf = [1]u8{0} ** 36;
+    var fbs = std.io.fixedBufferStream(&buf);
+    try Uuid.format(Uuid.Nil, "", .{}, fbs.writer());
+    try std.testing.expectEqualStrings("00000000-0000-0000-0000-000000000000", &buf);
+
+    fbs.reset();
+    try Uuid.format(Uuid{
+        .data = @bitCast([16]u8, @as(u128, 0x4ba7b74522ad_1da8_c242_d312_60515ff7)),
+    }, "", .{}, fbs.writer());
+    try std.testing.expectEqualStrings("f75f5160-12d3-42c2-a81d-ad2245b7a74b", &buf);
+}
+
+test "roundtrip random uuid" {
+    const uuid = Uuid.randV4(getRandom());
+
+    var buf: [36]u8 = undefined;
+    var fbs = std.io.fixedBufferStream(&buf);
+    try Uuid.format(uuid, "", .{}, fbs.writer());
+
+    const parsed = try Uuid.parse(&buf);
+
+    try std.testing.expectEqual(uuid, parsed);
+}
 pub const ciutf8 = struct {
     const Hash = std.hash.Wyhash;
     const View = std.unicode.Utf8View;