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rect.test.ts
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rect.test.ts
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import { is, isNot } from './helpers/assert';
import { Rect } from '../src/rect';
describe('Rect', () => {
it('Should create a correctly sized Rect from a ClientRect object', () => {
// Arrange
const element = {
getBoundingClientRect: () => ({
left: 100,
top: 200,
right: 300,
bottom: 400
})
}
// Act
const rect = Rect.fromElement(element as HTMLElement);
// Assert
is(rect.left, element.getBoundingClientRect().left);
is(rect.top, element.getBoundingClientRect().top);
is(rect.right, element.getBoundingClientRect().right);
is(rect.bottom, element.getBoundingClientRect().bottom);
});
it('Should create a correctly sized Rect from a Window object', () => {
// Arrange
const _window = {
innerWidth: 100,
innerHeight: 200
}
// Act
const rect = Rect.fromWindow(_window as any);
// Assert
is(rect.left, 0);
is(rect.top, 0);
is(rect.right, _window.innerWidth);
is(rect.bottom, _window.innerHeight);
});
describe('inflate', () => {
it('Should inflate correctly with a positive value', () => {
// Arrange
const inflateBy = 70;
const left = 0;
const top = 0;
const right = 100;
const bottom = 100;
const rect = new Rect(left, top, right, bottom);
// Act
rect.inflate(inflateBy);
// Assert
is(rect.left, left - inflateBy);
is(rect.top, top - inflateBy);
is(rect.right, right + inflateBy);
is(rect.bottom, bottom + inflateBy);
});
it('Should inflate correctly with a negative value', () => {
// Arrange
const inflateBy = -70;
const left = 0;
const top = 0;
const right = 100;
const bottom = 100;
const rect = new Rect(left, top, right, bottom);
// Act
rect.inflate(inflateBy);
// Assert
is(rect.left, left - inflateBy);
is(rect.top, top - inflateBy);
is(rect.right, right + inflateBy);
is(rect.bottom, bottom + inflateBy);
});
it('Should should not change if 0 is passed', () => {
// Arrange
const inflateBy = 0;
const left = 0;
const top = 0;
const right = 100;
const bottom = 100;
const rect = new Rect(left, top, right, bottom);
// Act
rect.inflate(inflateBy);
// Assert
is(rect.left, left);
is(rect.top, top);
is(rect.right, right);
is(rect.bottom, bottom);
});
});
describe('intersectsWith', () => {
it('Should not be true if first rectangle is on left side without intersecting', () => {
// Arrange
const rectA = new Rect(21, 0, 41, 20);
const rectB = new Rect(0, 0, 20, 20);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, false);
});
it('Should not be true if first rectangle is on top side without intersecting', () => {
// Arrange
const rectA = new Rect(0, 21, 20, 41);
const rectB = new Rect(0, 0, 20, 20);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, false);
});
it('Should not be true if second rectangle is on left side without intersecting', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(21, 0, 41, 20);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, false);
});
it('Should not be true if second rectangle is on top side without intersecting', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(0, 21, 20, 41);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, false);
});
it('Should be true if first rectangle\'s top left corner is inside second rectangle', () => {
// Arrange
const rectA = new Rect(10, 10, 30, 30);
const rectB = new Rect(0, 0, 20, 20);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Should be true if first rectangle\'s top right corner is inside second rectangle', () => {
// Arrange
const rectA = new Rect(-10, 10, 10, 30);
const rectB = new Rect(0, 0, 20, 20);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Should be true if first rectangle\'s bottom left corner is inside second rectangle', () => {
// Arrange
const rectA = new Rect(10, -10, 30, 10);
const rectB = new Rect(0, 0, 20, 20);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Should be true if first rectangle\'s bottom right corner is inside second rectangle', () => {
// Arrange
const rectA = new Rect(-10, -10, 10, 10);
const rectB = new Rect(0, 0, 20, 20);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
////
it('Should be true if second rectangle\'s top left corner is inside first rectangle', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(10, 10, 30, 30);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Should be true if second rectangle\'s top right corner is inside first rectangle', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(-10, 10, 10, 30);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Should be true if second rectangle\'s bottom left corner is inside first rectangle', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(10, -10, 30, 10);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Should be true if second rectangle\'s bottom right corner is inside first rectangle', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(-10, -10, 10, 10);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Should be true if first rectangle\'s side without corners is inside second rectangle', () => {
// Arrange
const rectA = new Rect(-10, -10, 10, 30);
const rectB = new Rect(0, 0, 20, 20);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Shoult be true if second rectangle\'s side without corners is inside first rectangle', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(-10, -10, 30, 10);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Should be true if first rectangle completely contains second rectangle', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(5, 5, 15, 15);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
it('Should be true if second rectangle completely contains first rectangle', () => {
// Arrange
const rectA = new Rect(5, 5, 15, 15);
const rectB = new Rect(0, 0, 20, 20);
// Act
const result = rectA.intersectsWith(rectB);
// Assert
is(result, true);
});
});
describe('getIntersectionWith', () => {
it('Should return a correctly sized Rect if two Rect\'s intersect horizontally', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(0, 10, 20, 30);
// Act
const result = rectA.getIntersectionWith(rectB);
// Assert
is(result.top, 10);
is(result.right, 20);
is(result.bottom, 20);
is(result.left, 0);
});
it('Should return a correctly sized Rect if two Rect\'s intersect vertically', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(10, 0, 30, 20);
// Act
const result = rectA.getIntersectionWith(rectB);
// Assert
is(result.top, 0);
is(result.right, 20);
is(result.bottom, 20);
is(result.left, 10);
});
it('Should return a correctly sized Rect if two Rect\'s intersect corners', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(10, 10, 30, 30);
// Act
const result = rectA.getIntersectionWith(rectB);
// Assert
is(result.top, 10);
is(result.right, 20);
is(result.bottom, 20);
is(result.left, 10);
});
it('Should return an empty Rect if two Rect\'s don\'t intersect', () => {
// Arrange
const rectA = new Rect(0, 0, 20, 20);
const rectB = new Rect(30, 30, 50, 50);
// Act
const result = rectA.getIntersectionWith(rectB);
// Assert
is(result.top, 0);
is(result.right, 0);
is(result.bottom, 0);
is(result.left, 0);
});
});
});