@wordpress/core-data/src/utils/test/on-sub-key.js

Access to and manipulation of core WordPress entities.

/**
 * External dependencies
 */
import deepFreeze from 'deep-freeze';

/**
 * Internal dependencies
 */
import onSubKey from '../on-sub-key';

describe( 'onSubKey', () => {
	function createEnhancedReducer( actionProperty ) {
		const enhanceReducer = onSubKey( actionProperty );
		return enhanceReducer(
			( state, action ) => 'Called by ' + action.caller
		);
	}

	it( 'should default to an empty object', () => {
		const reducer = createEnhancedReducer( 'caller' );
		const nextState = reducer( undefined, { type: '@@INIT' } );

		expect( nextState ).toEqual( {} );
	} );

	it( 'should ignore actions where property not present', () => {
		const state = deepFreeze( {} );
		const reducer = createEnhancedReducer( 'caller' );
		const nextState = reducer( state, { type: 'DO_FOO' } );

		expect( nextState ).toBe( state );
	} );

	it( 'should key by action property', () => {
		const reducer = createEnhancedReducer( 'caller' );

		let state = deepFreeze( {} );
		state = reducer( state, { type: 'DO_FOO', caller: 1 } );
		state = reducer( state, { type: 'DO_FOO', caller: 2 } );

		expect( state ).toEqual( {
			1: 'Called by 1',
			2: 'Called by 2',
		} );
	} );
} );