Add tests to 4-stretch/card-validator.test.js

Author: Temceo

Sprint-3/4-stretch/card-validator.test.js

@@ -0,0 +1,43 @@
+const validateCard = require("./card-validator");
+
+test("should have 16 digits, all numbers", () => {
+  const cardNumber = 9999777788880000;
+  const result = validateCard(cardNumber);
+  expect(result).toBe("Valid card");
+});
+
+test("should not have less than 16 digits", () => {
+  const cardNumber = 99997777;
+  const result = validateCard(cardNumber);
+  expect(result).toBe("Invalid card");
+});
+
+test("should have at least two different distinct digits", () => {
+  const cardNumber = 9999777788880000;
+  const result = validateCard(cardNumber);
+  expect(result).toBe("Valid card");
+});
+
+test("should have even final digit", () => {
+  const cardNumber = 6666666666661666;
+  const result = validateCard(cardNumber);
+  expect(result).toBe("Valid card");
+});
+
+test("total sum of numbers should be greater than 15", () => {
+  const cardNumber = 6666666666661666;
+  const result = validateCard(cardNumber);
+  expect(result).toBe("Valid card");
+});
+
+test("single repeating digit is invalid", () => {
+  const cardNumber = 4444444444444444;
+  const result = validateCard(cardNumber);
+  expect(result).toBe("Invalid card");
+});
+
+test("digits cannot include non numerals", () => {
+  const cardNumber = "a92332119c011112";
+  const result = validateCard(cardNumber);
+  expect(result).toBe("Invalid card");
+});