diff --git a/src/test/temperature.test.ts b/src/test/temperature.test.ts
index 3f58906..6e82d9c 100644
--- a/src/test/temperature.test.ts
+++ b/src/test/temperature.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect } from "vitest";
-import { isOverheating } from "../temperature";
+import { isOverheating, isZero} from "../temperature";
 
 describe("isOverheating", () => {
   it("returns true if temp is above 70", () => {
@@ -10,3 +10,13 @@ describe("isOverheating", () => {
     expect(isOverheating(70)).toBe(false);
   });
 });
+
+describe("isZero", () => {
+  it("returns true if temp is 0", () => {
+    expect(isZero(0)).toBe(true);
+  });
+
+  it("returns false if temp is 0", () => {
+    expect(isZero(5)).toBe(false);
+  });
+});
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