@applicaster/zapp-react-native-utils/utils/__tests__/endsWith.test.ts

Applicaster Zapp React Native utilities package

import { endsWith } from "../endsWith";

describe("endsWith", () => {
  it("returns false when str is null", () => {
    expect(endsWith("a", null)).toBe(false);
  });

  it("returns false when str is undefined", () => {
    expect(endsWith("a", undefined)).toBe(false);
  });

  it("returns true when string ends with target", () => {
    expect(endsWith("lo", "hello")).toBe(true);
    expect(endsWith("", "hello")).toBe(true); // empty target always matches
  });

  it("returns false when string does not end with target", () => {
    expect(endsWith("yo", "hello")).toBe(false);
  });

  it("works with single character target", () => {
    expect(endsWith("o", "hello")).toBe(true);
    expect(endsWith("x", "hello")).toBe(false);
  });

  it("is case-sensitive", () => {
    expect(endsWith("Lo", "hello")).toBe(false);
    expect(endsWith("lo", "hello")).toBe(true);
  });
});