woocommerce/packages/woocommerce-blocks/assets/js/base/hooks/test/use-previous.js
2021-12-10 12:03:04 +00:00

90 lines
2.5 KiB
JavaScript

/**
* External dependencies
*/
import TestRenderer, { act } from 'react-test-renderer';
/**
* Internal dependencies
*/
import { usePrevious } from '../use-previous';
describe( 'usePrevious', () => {
const TestComponent = ( { testValue, validation } ) => {
const previousValue = usePrevious( testValue, validation );
return <div testValue={ testValue } previousValue={ previousValue } />;
};
let renderer;
beforeEach( () => ( renderer = null ) );
it( 'should be undefined at first pass', () => {
act( () => {
renderer = TestRenderer.create( <TestComponent testValue={ 1 } /> );
} );
const testValue = renderer.root.findByType( 'div' ).props.testValue;
const testPreviousValue = renderer.root.findByType( 'div' ).props
.previousValue;
expect( testValue ).toBe( 1 );
expect( testPreviousValue ).toBe( undefined );
} );
it( 'test new and previous value', () => {
let testValue;
let testPreviousValue;
act( () => {
renderer = TestRenderer.create( <TestComponent testValue={ 1 } /> );
} );
act( () => {
renderer.update( <TestComponent testValue={ 2 } /> );
} );
testValue = renderer.root.findByType( 'div' ).props.testValue;
testPreviousValue = renderer.root.findByType( 'div' ).props
.previousValue;
expect( testValue ).toBe( 2 );
expect( testPreviousValue ).toBe( 1 );
act( () => {
renderer.update( <TestComponent testValue={ 3 } /> );
} );
testValue = renderer.root.findByType( 'div' ).props.testValue;
testPreviousValue = renderer.root.findByType( 'div' ).props
.previousValue;
expect( testValue ).toBe( 3 );
expect( testPreviousValue ).toBe( 2 );
} );
it( 'should not update value if validation fails', () => {
let testValue;
let testPreviousValue;
act( () => {
renderer = TestRenderer.create(
<TestComponent testValue={ 1 } validation={ Number.isFinite } />
);
} );
act( () => {
renderer.update(
<TestComponent testValue="abc" validation={ Number.isFinite } />
);
} );
testValue = renderer.root.findByType( 'div' ).props.testValue;
testPreviousValue = renderer.root.findByType( 'div' ).props
.previousValue;
expect( testValue ).toBe( 'abc' );
expect( testPreviousValue ).toBe( 1 );
act( () => {
renderer.update(
<TestComponent testValue={ 3 } validation={ Number.isFinite } />
);
} );
testValue = renderer.root.findByType( 'div' ).props.testValue;
testPreviousValue = renderer.root.findByType( 'div' ).props
.previousValue;
expect( testValue ).toBe( 3 );
expect( testPreviousValue ).toBe( 1 );
} );
} );