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

Applicaster Zapp React Native utilities package

import { isIndexInRange } from "..";

describe("isIndexInRange", () => {
  it("first element", () => {
    const index = 0;
    const length = 3;

    expect(isIndexInRange(index, length)).toBe(true);
  });

  it("last element", () => {
    const index = 2;
    const length = 3;

    expect(isIndexInRange(index, length)).toBe(true);
  });

  it("index out of range", () => {
    const index = 3;
    const length = 3;

    expect(isIndexInRange(index, length)).toBe(false);
  });

  it("negative index", () => {
    const index = -1;
    const length = 3;

    expect(isIndexInRange(index, length)).toBe(false);
  });

  it("first element, but empty array", () => {
    const index = 0;
    const length = 0;

    expect(isIndexInRange(index, length)).toBe(false);
  });

  it("index is NaN", () => {
    const index = NaN;
    const length = 3;

    expect(isIndexInRange(index, length)).toBe(false);
  });

  it("index is Infinity", () => {
    const index = Infinity;
    const length = 3;

    expect(isIndexInRange(index, length)).toBe(false);
  });

  it("index is -Infinity", () => {
    const index = -Infinity;
    const length = 3;

    expect(isIndexInRange(index, length)).toBe(false);
  });
});