react-native-reanimated-carousel/lib/module/utils/compute-offset-if-size-changed.test.js

Simple carousel component.fully implemented using Reanimated 2.Infinitely scrolling, very smooth.

import { computeOffsetIfSizeChanged } from "./compute-offset-if-size-changed";
describe("computeOffsetIfSizeChanged", () => {
  it("[CASE 1] should return the correct values when size does not change", () => {
    const prevIndex = 1;
    const prevSize = 500;
    const size = 500;
    const handlerOffset = prevIndex * size;
    const result = computeOffsetIfSizeChanged({
      prevSize,
      size,
      handlerOffset
    });
    const finallyIndex = result / size;
    expect(finallyIndex).toEqual(prevIndex);
  });
  it("[CASE 2] should return the correct values when size changes from 500 to 400", () => {
    const prevIndex = 1;
    const prevSize = 500;
    const size = 400;
    const handlerOffset = prevIndex * prevSize;
    const result = computeOffsetIfSizeChanged({
      prevSize,
      size,
      handlerOffset
    });
    const finallyIndex = result / size;
    expect(finallyIndex).toEqual(prevIndex);
  });
  it("[CASE 3] should return the correct values when size changes from 500 to 499", () => {
    const prevIndex = 1;
    const prevSize = 500;
    const size = 499;
    const handlerOffset = prevIndex * prevSize;
    const result = computeOffsetIfSizeChanged({
      prevSize,
      size,
      handlerOffset
    });
    const finallyIndex = result / size;
    expect(finallyIndex).toEqual(prevIndex);
  });
  it("[CASE 4] should return the correct values when size changes from 500 to 501", () => {
    const prevIndex = 1;
    const prevSize = 500;
    const size = 501;
    const handlerOffset = prevIndex * prevSize;
    const result = computeOffsetIfSizeChanged({
      prevSize,
      size,
      handlerOffset
    });
    const finallyIndex = result / size;
    expect(finallyIndex).toEqual(prevIndex);
  });
  it("[CASE 5] should return the correct values when size changes from 224 to 524", () => {
    const prevIndex = 1;
    const prevSize = 224;
    const size = 524;
    const handlerOffset = prevIndex * prevSize;
    const result = computeOffsetIfSizeChanged({
      prevSize,
      size,
      handlerOffset
    });
    const finallyIndex = result / size;
    expect(finallyIndex).toEqual(prevIndex);
  });
});
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