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Comparing your usual unit tests to snapshot tests. The output on failure is the same. If I'd been lazier on the normal version and only checked a couple properties the snapshot test would be much more thorough by comparison. You can see why it becomes more beneficial as the data size grows (like a React element tree or an API response).
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import * as sinon from 'sinon' | |
import { setCookie, clearCookie } from './cookies' | |
describe('cookies', () => { | |
it('setCookie (defaults)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
setCookie(ctx as any, 'test', 'val') | |
expect(spy.callCount).toBe(1) | |
expect(spy.firstCall.args).toEqual([ | |
'test', | |
'val', | |
{ | |
domain: 'test.host', | |
httpOnly: true, | |
maxAge: 10000, | |
overwrite: true | |
} | |
]) | |
}) | |
it('setCookie (config overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
setCookie(ctx as any, 'test-overrides', 'val') | |
expect(spy.callCount).toBe(1) | |
expect(spy.firstCall.args).toEqual([ | |
'test-overrides', | |
'val', | |
{ | |
domain: 'overridden.host', | |
httpOnly: true, | |
maxAge: 10000, | |
overwrite: false | |
} | |
]) | |
}) | |
it('setCookie (direct overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
setCookie(ctx as any, 'test', 'val', { domain: undefined, httpOnly: false }) | |
expect(spy.callCount).toBe(1) | |
expect(spy.firstCall.args).toEqual([ | |
'test', | |
'val', | |
{ | |
domain: undefined, | |
httpOnly: false, | |
maxAge: 10000, | |
overwrite: true | |
} | |
]) | |
}) | |
it('setCookie (both overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
setCookie(ctx as any, 'test-overrides', 'val', { domain: undefined }) | |
expect(spy.callCount).toBe(1) | |
expect(spy.firstCall.args).toEqual([ | |
'test-overrides', | |
'val', | |
{ | |
domain: undefined, | |
httpOnly: true, | |
maxAge: 10000, | |
overwrite: false | |
} | |
]) | |
}) | |
it('clearCookie (defaults)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
clearCookie(ctx as any, 'test') | |
expect(spy.callCount).toBe(1) | |
expect(spy.firstCall.args).toEqual([ | |
'test', | |
undefined, | |
{ | |
domain: 'test.host', | |
httpOnly: true, | |
maxAge: 10000, | |
overwrite: true | |
} | |
]) | |
}) | |
it('clearCookie (config overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
clearCookie(ctx as any, 'test-overrides') | |
expect(spy.callCount).toBe(1) | |
expect(spy.firstCall.args).toEqual([ | |
'test-overrides', | |
undefined, | |
{ | |
domain: 'overridden.host', | |
httpOnly: true, | |
maxAge: 10000, | |
overwrite: false | |
} | |
]) | |
}) | |
it('clearCookie (direct overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
clearCookie(ctx as any, 'test', { domain: undefined, httpOnly: false }) | |
expect(spy.callCount).toBe(1) | |
expect(spy.firstCall.args).toEqual([ | |
'test', | |
undefined, | |
{ | |
domain: undefined, | |
httpOnly: false, | |
maxAge: 10000, | |
overwrite: true | |
} | |
]) | |
}) | |
it('clearCookie (both overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
clearCookie(ctx as any, 'test-overrides', { domain: undefined }) | |
expect(spy.callCount).toBe(1) | |
expect(spy.firstCall.args).toEqual([ | |
'test-overrides', | |
undefined, | |
{ | |
domain: undefined, | |
httpOnly: true, | |
maxAge: 10000, | |
overwrite: false | |
} | |
]) | |
}) | |
}) |
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import * as sinon from 'sinon' | |
import { setCookie, clearCookie } from './cookies' | |
describe('cookies', () => { | |
it('setCookie (defaults)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
setCookie(ctx as any, 'test', 'val') | |
expect(spy.callCount).toMatchSnapshot() | |
expect(spy.firstCall.args).toMatchSnapshot() | |
}) | |
it('setCookie (config overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
setCookie(ctx as any, 'test-overrides', 'val') | |
expect(spy.callCount).toMatchSnapshot() | |
expect(spy.firstCall.args).toMatchSnapshot() | |
}) | |
it('setCookie (direct overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
setCookie(ctx as any, 'test', 'val', { domain: undefined, httpOnly: false }) | |
expect(spy.callCount).toMatchSnapshot() | |
expect(spy.firstCall.args).toMatchSnapshot() | |
}) | |
it('setCookie (both overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
setCookie(ctx as any, 'test-overrides', 'val', { domain: undefined }) | |
expect(spy.callCount).toMatchSnapshot() | |
expect(spy.firstCall.args).toMatchSnapshot() | |
}) | |
it('clearCookie (defaults)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
clearCookie(ctx as any, 'test') | |
expect(spy.callCount).toMatchSnapshot() | |
expect(spy.firstCall.args).toMatchSnapshot() | |
}) | |
it('clearCookie (config overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
clearCookie(ctx as any, 'test-overrides') | |
expect(spy.callCount).toMatchSnapshot() | |
expect(spy.firstCall.args).toMatchSnapshot() | |
}) | |
it('clearCookie (direct overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
clearCookie(ctx as any, 'test', { domain: undefined, httpOnly: false }) | |
expect(spy.callCount).toMatchSnapshot() | |
expect(spy.firstCall.args).toMatchSnapshot() | |
}) | |
it('clearCookie (both overrides)', () => { | |
const spy = sinon.spy() | |
const ctx = { cookies: { set: spy } } | |
clearCookie(ctx as any, 'test-overrides', { domain: undefined }) | |
expect(spy.callCount).toMatchSnapshot() | |
expect(spy.firstCall.args).toMatchSnapshot() | |
}) | |
}) |
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