diff --git a/test/02-1-functions.spec.js b/test/02-1-functions.spec.js
new file mode 100644
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+++ b/test/02-1-functions.spec.js
@@ -0,0 +1,23 @@
+describe("formatTime function", () => {
+  it("should correctly format time for a range of seconds", () => {
+    expect(formatTime(125)).toEqual("02:05");
+    expect(formatTime(60)).toEqual("01:00");
+    expect(formatTime(59)).toEqual("00:59");
+    expect(formatTime(0)).toEqual("00:00");
+    // Add more cases as needed
+  });
+});
+
+describe("formatTime function", () => {
+  it("should count up to the specified number of seconds and log each second", (done) => {
+    spyOn(console, "log");
+    countUpTo(3);
+    setTimeout(() => {
+      expect(console.log).toHaveBeenCalledWith("Elapsed time: 00:01");
+      expect(console.log).toHaveBeenCalledWith("Elapsed time: 00:02");
+      expect(console.log).toHaveBeenCalledWith("Elapsed time: 00:03");
+      expect(console.log).toHaveBeenCalledWith("Time's up!");
+      done();
+    }, 3500); // Slightly more than 3 seconds to ensure all intervals have run
+  });
+});