In till.test.js test cases written and tested.

Author: Mahtem

Sprint-2/stretch/till.test.js

@@ -0,0 +1,49 @@
+const totalTill = require("./till.js");
+
+describe("totalTill()", () => {
+  test("correctly totals a simple till", () => {
+    const till = {
+      "1p": 10,    // 10p
+      "5p": 6,     // 30p
+      "20p": 10,   // 200p
+      "50p": 4,    // 200p
+    };
+   
+    expect(totalTill(till)).toBe("£4.40");
+  });
+
+  test("ignores invalid coin types", () => {
+    const till = {
+      "1p": 2,     // 2p
+      "abc": 10,  // ignore
+      "£1": 5,     
+    };
+
+    expect(totalTill(till)).toEqual("£0.02");
+  });
+
+  test("handles empty till", () => {
+    expect(totalTill({})).toEqual("£0.00");
+  });
+
+  test("throws an error for non-object input", () => {
+    expect(() => totalTill(null)).toThrow("Input should be an object");
+    expect(() => totalTill(5)).toThrow("Input should be an object");
+    expect(() => totalTill("hello")).toThrow("Input should be an object");
+    expect(() => totalTill([])).toThrow("Input should be an object");
+  });
+
+  test("correct formatting for values under 10p", () => {
+    const till = { "1p": 3 }; // 3p
+    expect(totalTill(till)).toEqual("£0.03");
+  });
+
+  test("correct formatting when total is exactly whole pounds", () => {
+    const till = { "50p": 4, "20p": 5 }; 
+    // 50p*4 = 200p, 20p*5 = 100p → total = 300p = £3.00
+
+    expect(totalTill(till)).toEqual("£3.00");
+  });
+});
+
+// In till.test.js test cases written and tested.