index.test.js
4.65 KB
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const { and, or } = require('./index.js')
const isEven = n => n % 2 === 0
const isPositive = n => n > 0
const isBig = n => Math.abs(n) >= 1000
describe('and', () => {
test('return true with no predicates', () => {
expect(and()(1)).toBe(true)
})
test('return result of single predicate', () => {
expect(and(isEven)(1)).toBe(false)
expect(and(isEven)(2)).toBe(true)
})
test('return logical AND of two predicates', () => {
expect(and(isEven, isPositive)(-2)).toBe(false)
expect(and(isEven, isPositive)(-1)).toBe(false)
expect(and(isEven, isPositive)(1)).toBe(false)
expect(and(isEven, isPositive)(2)).toBe(true)
})
test('return logical AND of three predicates', () => {
expect(and(isEven, isPositive, isBig)(-2)).toBe(false)
expect(and(isEven, isPositive, isBig)(-1)).toBe(false)
expect(and(isEven, isPositive, isBig)(1)).toBe(false)
expect(and(isEven, isPositive, isBig)(2)).toBe(false)
expect(and(isEven, isPositive, isBig)(-1002)).toBe(false)
expect(and(isEven, isPositive, isBig)(-1001)).toBe(false)
expect(and(isEven, isPositive, isBig)(1001)).toBe(false)
expect(and(isEven, isPositive, isBig)(1002)).toBe(true)
})
test('return value of single boolean', () => {
expect(and(true)(1)).toBe(true)
expect(and(false)(1)).toBe(false)
})
test('return value of two booleans', () => {
expect(and(false, false)(1)).toBe(false)
expect(and(false, true)(1)).toBe(false)
expect(and(true, false)(1)).toBe(false)
expect(and(true, true)(1)).toBe(true)
})
test('return value of multiple booleans', () => {
expect(and(false, false, false)(1)).toBe(false)
expect(and(false, true, false)(1)).toBe(false)
expect(and(true, false, false)(1)).toBe(false)
expect(and(true, true, false)(1)).toBe(false)
expect(and(false, false, true)(1)).toBe(false)
expect(and(false, true, true)(1)).toBe(false)
expect(and(true, false, true)(1)).toBe(false)
expect(and(true, true, true)(1)).toBe(true)
})
test('return value of mixed booleans and functions', () => {
expect(and(false, isEven)(1)).toBe(false)
expect(and(false, isEven)(2)).toBe(false)
expect(and(true, isEven)(1)).toBe(false)
expect(and(true, isEven)(2)).toBe(true)
expect(and(isEven, false)(1)).toBe(false)
expect(and(isEven, false)(2)).toBe(false)
expect(and(isEven, true)(1)).toBe(false)
expect(and(isEven, true)(2)).toBe(true)
})
})
describe('or', () => {
test('return false with no predicates', () => {
expect(or()(1)).toBe(false)
})
test('return result of single predicate', () => {
expect(or(isEven)(1)).toBe(false)
expect(or(isEven)(2)).toBe(true)
})
test('return logical OR of two predicates', () => {
expect(or(isEven, isPositive)(-2)).toBe(true)
expect(or(isEven, isPositive)(-1)).toBe(false)
expect(or(isEven, isPositive)(1)).toBe(true)
expect(or(isEven, isPositive)(2)).toBe(true)
})
test('return logical OR of three predicates', () => {
expect(or(isEven, isPositive, isBig)(-2)).toBe(true)
expect(or(isEven, isPositive, isBig)(-1)).toBe(false)
expect(or(isEven, isPositive, isBig)(0)).toBe(true)
expect(or(isEven, isPositive, isBig)(1)).toBe(true)
expect(or(isEven, isPositive, isBig)(2)).toBe(true)
expect(or(isEven, isPositive, isBig)(-1002)).toBe(true)
expect(or(isEven, isPositive, isBig)(-1001)).toBe(true)
expect(or(isEven, isPositive, isBig)(1001)).toBe(true)
expect(or(isEven, isPositive, isBig)(1002)).toBe(true)
})
test('return value of single boolean', () => {
expect(or(true)(1)).toBe(true)
expect(or(false)(1)).toBe(false)
})
test('return value of two booleans', () => {
expect(or(false, false)(1)).toBe(false)
expect(or(false, true)(1)).toBe(true)
expect(or(true, false)(1)).toBe(true)
expect(or(true, true)(1)).toBe(true)
})
test('return value of multiple booleans', () => {
expect(or(false, false, false)(1)).toBe(false)
expect(or(false, true, false)(1)).toBe(true)
expect(or(true, false, false)(1)).toBe(true)
expect(or(true, true, false)(1)).toBe(true)
expect(or(false, false, true)(1)).toBe(true)
expect(or(false, true, true)(1)).toBe(true)
expect(or(true, false, true)(1)).toBe(true)
expect(or(true, true, true)(1)).toBe(true)
})
test('return value of mixed booleans and functions', () => {
expect(or(false, isEven)(1)).toBe(false)
expect(or(false, isEven)(2)).toBe(true)
expect(or(true, isEven)(1)).toBe(true)
expect(or(true, isEven)(2)).toBe(true)
expect(or(isEven, false)(1)).toBe(false)
expect(or(isEven, false)(2)).toBe(true)
expect(or(isEven, true)(1)).toBe(true)
expect(or(isEven, true)(2)).toBe(true)
})
})