moy-fp/test/List/contains.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * a -> [a] -> Boolean
 */
import contains from '../../src/List/contains'

test('contains(not using __), not reference type, return true', () => {
  expect(
    contains(3)([1, 2, 3, 4])
  ).toBeTruthy()
})

test('contains(not using __), not reference type, return false', () => {
  expect(
    contains(5)([1, 2, 3, 4])
  ).toBeFalsy()
})

test('contains(not using __), reference type, return true', () => {
  expect(
    contains({a: 3})([{a: 1}, {a: 2}, {a: 3}, {a: 4}])
  ).toBeTruthy()
})

test('contains(not using __), reference type, return false', () => {
  expect(
    contains({a: 5})([{a: 1}, {a: 2}, {a: 3}, {a: 4}])
  ).toBeFalsy()
})

test('contains(using __), not reference type, return true', () => {
  expect(
    contains(__, [1, 2, 3, 4])(3)
  ).toBeTruthy()
})