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import { Triangle } from './triangle';
describe('Triangle', () => {
describe('equilateral triangle', () => {
test('all sides are equal', () => {
const triangle = new Triangle(2, 2, 2);
expect(triangle.isEquilateral).toBe(true);
});
test('any side is unequal', () => {
const triangle = new Triangle(2, 3, 2);
expect(triangle.isEquilateral).toBe(false);
});
test('no sides are equal', () => {
const triangle = new Triangle(5, 4, 6);
expect(triangle.isEquilateral).toBe(false);
});
test('all zero sides is not a triangle', () => {
const triangle = new Triangle(0, 0, 0);
expect(triangle.isEquilateral).toBe(false);
});
test('sides may be floats', () => {
const triangle = new Triangle(0.5, 0.5, 0.5);
expect(triangle.isEquilateral).toBe(true);
});
});
describe('isosceles triangle', () => {
test('last two sides are equal', () => {
const triangle = new Triangle(3, 4, 4);
expect(triangle.isIsosceles).toBe(true);
});
test('first two sides are equal', () => {
const triangle = new Triangle(4, 4, 3);
expect(triangle.isIsosceles).toBe(true);
});
test('first and last sides are equal', () => {
const triangle = new Triangle(4, 3, 4);
expect(triangle.isIsosceles).toBe(true);
});
test('equilateral triangles are also isosceles', () => {
const triangle = new Triangle(4, 4, 4);
expect(triangle.isIsosceles).toBe(true);
});
test('no sides are equal', () => {
const triangle = new Triangle(2, 3, 4);
expect(triangle.isIsosceles).toBe(false);
});
test('first triangle inequality violation', () => {
const triangle = new Triangle(1, 1, 3);
expect(triangle.isIsosceles).toBe(false);
});
test('second triangle inequality violation', () => {
const triangle = new Triangle(1, 3, 1);
expect(triangle.isIsosceles).toBe(false);
});
test('third triangle inequality violation', () => {
const triangle = new Triangle(3, 1, 1);
expect(triangle.isIsosceles).toBe(false);
});
test('sides may be floats', () => {
const triangle = new Triangle(0.5, 0.4, 0.5);
expect(triangle.isIsosceles).toBe(true);
});
});
describe('scalene triangle', () => {
test('no sides are equal', () => {
const triangle = new Triangle(5, 4, 6);
expect(triangle.isScalene).toBe(true);
});
test('all sides are equal', () => {
const triangle = new Triangle(4, 4, 4);
expect(triangle.isScalene).toBe(false);
});
test('two sides are equal', () => {
const triangle = new Triangle(4, 4, 3);
expect(triangle.isScalene).toBe(false);
});
test('may not violate triangle inequality', () => {
const triangle = new Triangle(7, 3, 2);
expect(triangle.isScalene).toBe(false);
});
test('sides may be floats', () => {
const triangle = new Triangle(0.5, 0.4, 0.6);
expect(triangle.isScalene).toBe(true);
});
});
});
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