Add test of getFilteredCars

src/constants/getFilteredCars.test.js

@@ -0,0 +1,29 @@
+import {getFilteredCars} from './getFilteredCars';
+
+test("Passes a car successfully", () => {
+  const payload = [{mileage: 10, rentalPrice: "20$"}];
+  const filter = {minMileage: 5, maxMileage: 15, price: 40};
+  expect(getFilteredCars(payload, filter))
+    .toEqual(payload);
+});
+
+test("Handle undefined mileage as no limit", () => {
+  const payload = [{mileage: 10, rentalPrice: "20$"}];
+  const filter = {price: 40};
+  expect(getFilteredCars(payload, filter))
+    .toEqual(payload);
+});
+
+test("Handle null mileage as no limit", () => {
+  const payload = [{mileage: 10, rentalPrice: "20$"}];
+  const filter = {minMileage: null, maxMileage: null,  price: 40};
+  expect(getFilteredCars(payload, filter))
+    .toEqual(payload);
+});
+
+test("Divert a car with non-conforming mileage", () => {
+  const payload = [{mileage: 10, rentalPrice: "20$"}];
+  const filter = {minMileage: 15, maxMileage: 40, price: 40};
+  expect(getFilteredCars(payload, filter))
+    .toEqual([]);
+});