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convert the compose test to typescript #3509

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merged 1 commit into from
Aug 16, 2019
Merged

convert the compose test to typescript #3509

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35 changes: 18 additions & 17 deletions test/compose.spec.js → test/compose.spec.ts
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Original file line number Diff line number Diff line change
@@ -1,10 +1,10 @@
import { compose } from '../'
import { compose } from '..'

describe('Utils', () => {
describe('compose', () => {
it('composes from right to left', () => {
const double = x => x * 2
const square = x => x * x
const double = (x: number) => x * 2
const square = (x: number) => x * x
expect(compose(square)(5)).toBe(25)
expect(
compose(
Expand All @@ -22,10 +22,10 @@ describe('Utils', () => {
})

it('composes functions from right to left', () => {
const a = next => x => next(x + 'a')
const b = next => x => next(x + 'b')
const c = next => x => next(x + 'c')
const final = x => x
const a = (next: (x: string) => string) => (x: string) => next(x + 'a')
const b = (next: (x: string) => string) => (x: string) => next(x + 'b')
const c = (next: (x: string) => string) => (x: string) => next(x + 'c')
const final = (x: string) => x

expect(
compose(
Expand All @@ -51,14 +51,15 @@ describe('Utils', () => {
})

it('throws at runtime if argument is not a function', () => {
const square = x => x * x
const add = (x, y) => x + y
type sFunc = (x: number, y: number) => number
const square = (x: number, _: number) => x * x
const add = (x: number, y: number) => x + y

expect(() =>
compose(
square,
add,
false
(false as unknown) as sFunc
)(1, 2)
).toThrow()
expect(() =>
Expand All @@ -72,28 +73,28 @@ describe('Utils', () => {
compose(
square,
add,
true
(true as unknown) as sFunc
)(1, 2)
).toThrow()
expect(() =>
compose(
square,
add,
NaN
(NaN as unknown) as sFunc
)(1, 2)
).toThrow()
expect(() =>
compose(
square,
add,
'42'
('42' as unknown) as sFunc
)(1, 2)
).toThrow()
})

it('can be seeded with multiple arguments', () => {
const square = x => x * x
const add = (x, y) => x + y
const square = (x: number, _: number) => x * x
const add = (x: number, y: number) => x + y
expect(
compose(
square,
Expand All @@ -103,9 +104,9 @@ describe('Utils', () => {
})

it('returns the first given argument if given no functions', () => {
expect(compose()(1, 2)).toBe(1)
expect(compose<number>()(1, 2)).toBe(1)
expect(compose()(3)).toBe(3)
expect(compose()()).toBe(undefined)
expect(compose()(undefined)).toBe(undefined)
})

it('returns the first function if given only one', () => {
Expand Down