diff --git a/test/utils/DateUtils-test.ts b/test/utils/DateUtils-test.ts
new file mode 100644
index 0000000000..ad0530c87e
--- /dev/null
+++ b/test/utils/DateUtils-test.ts
@@ -0,0 +1,31 @@
+/*
+Copyright 2021 Šimon Brandner <simon.bra.ag@gmail.com>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { formatSeconds } from "../../src/DateUtils";
+
+describe("formatSeconds", () => {
+    it("correctly formats time with hours", () => {
+        expect(formatSeconds((60 * 60 * 3) + (60 * 31) + (55))).toBe("03:31:55");
+        expect(formatSeconds((60 * 60 * 3) + (60 * 0) + (55))).toBe("03:00:55");
+        expect(formatSeconds((60 * 60 * 3) + (60 * 31) + (0))).toBe("03:31:00");
+    });
+
+    it("correctly formats time without hours", () => {
+        expect(formatSeconds((60 * 60 * 0) + (60 * 31) + (55))).toBe("31:55");
+        expect(formatSeconds((60 * 60 * 0) + (60 * 0) + (55))).toBe("00:55");
+        expect(formatSeconds((60 * 60 * 0) + (60 * 31) + (0))).toBe("31:00");
+    });
+});