import { describe, given, it, Test } from '@typed/test'

import { propEq } from './propEq'

export const test: Test = describe(`propEq`, [
  given(`a key`, [
    it(`returns a function`, ({ equal }) => {
      const aProp = propEq('a')

      equal('function', typeof aProp)
    }),
  ]),

  given(`a key and a value`, [
    it(`returns a function`, ({ equal }) => {
      const aPropIsOne = propEq('a', 1)

      equal('function', typeof aPropIsOne)
    }),
  ]),

  given(`a key, value and object`, [
    it(`returns true if object has same value at specified key`, ({ ok }) => {
      interface Foo {
        readonly a: number
        readonly b: number
      }

      const testFoo: Foo = { a: 1, b: 2 }

      const aPropIsOne = propEq('a', 1)

      ok(aPropIsOne(testFoo))
    }),

    it(`returns false if object does not have same value at specified key`, ({ notOk }) => {
      interface Foo {
        readonly a: number
        readonly b: number
      }

      const aPropIsOne = propEq('a', 1)

      const testFoo: Foo = { a: 2, b: 1 }

      notOk(aPropIsOne(testFoo))
    }),
  ]),
])