Test

src/averageTemperatureReading.ts

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+export function averageTemperatureReading(values: number[]): number {
+  if (values.length === 0) return 0;
+  return values.reduce((a, b) => a + b, 0) / values.length;
+}

src/test/averageTemperatureReading.test.ts

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+import { describe, it, expect } from "vitest";
+import { averageTemperatureReading } from "../averageTemperatureReading";
+
+describe("averageTemperatureReading", () => {
+  it("should return the average of multiple values", () => {
+    expect(averageTemperatureReading([10, 20, 30])).toBe(30);
+  });
+
+  it("should return the same value if only one element", () => {
+    expect(averageTemperatureReading([42])).toBe(42);
+  });
+
+  it("should return 0 for an empty array", () => {
+    expect(averageTemperatureReading([])).toBe(0);
+  });
+});

src/test/toggleLed.test.ts

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+import { describe, it, expect } from "vitest";
+import { toggleLed } from "../toggleLed";
+
+describe("toggleLed", () => {
+  it("should turn ON when currently OFF", () => {
+    expect(toggleLed(false)).toBe(true);
+  });
+
+  it("should turn OFF when currently ON", () => {
+    expect(toggleLed(true)).toBe(false);
+  });
+});

src/test/turnOnFan.test.ts

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+import { describe, it, expect } from "vitest";
+import { turnOnFan } from "../turnOnFan";
+
+describe("turnOnFan", () => {
+  it("should turn fan ON when temperature is above threshold", () => {
+    expect(turnOnFan(35)).toBe(true);
+  });
+
+  it("should keep fan OFF when temperature is below threshold", () => {
+    expect(turnOnFan(25)).toBe(false);
+  });
+
+  it("should keep fan OFF when temperature is exactly at the threshold", () => {
+    expect(turnOnFan(30)).toBe(false);
+  });
+
+  it("should use custom threshold if provided", () => {
+    expect(turnOnFan(50, 45)).toBe(true);
+    expect(turnOnFan(40, 45)).toBe(false);
+  });
+});

src/toggleLed.ts

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+export function toggleLed(state: boolean): boolean {
+  return !state;
+}

src/turnOnFan.ts

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+export function turnOnFan(temperature: number, threshold: number = 30): boolean {
+  return temperature > threshold;
+}