diff --git a/t/Helper/BuildDiff.t b/t/Helper/BuildDiff.t
new file mode 100644
index 00000000..86bf3fba
--- /dev/null
+++ b/t/Helper/BuildDiff.t
@@ -0,0 +1,27 @@
+use strict;
+use warnings;
+use Setup;
+use Test2::V0;
+
+use Hydra::Helper::BuildDiff;
+
+my $ctx = test_context();
+
+subtest "response" => sub {
+    my $ret = buildDiff([], []);
+    is($ret, [
+        stillSucceed => [],
+        stillFail => [],
+        nowSucceed => [],
+        nowFail => [],
+        new => [],
+        removed => [],
+        unfinished => [],
+        aborted => [],
+        failed => [],
+    ]);
+};
+
+is(1, 1);
+
+done_testing;