@wordpress/data/src/redux-store/metadata/test/utils.js

Data module for WordPress.

/**
 * Internal dependencies
 */
import { selectorArgsToStateKey, onSubKey } from '../utils';

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 = {};
		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 = Object.freeze( {} );
		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',
		} );
	} );
} );

describe( 'selectorArgsToStateKey', () => {
	it( 'should default to an empty array', () => {
		expect( selectorArgsToStateKey( undefined ) ).toEqual( [] );
	} );

	it( 'should remove trailing undefined values', () => {
		expect( selectorArgsToStateKey( [ 1, 2, undefined ] ) ).toEqual( [
			1, 2,
		] );
		expect(
			selectorArgsToStateKey( [ 1, 2, undefined, undefined ] )
		).toEqual( [ 1, 2 ] );
	} );

	it( 'should leave non-trailing undefined values alone', () => {
		expect(
			selectorArgsToStateKey( [ 1, undefined, 2, undefined ] )
		).toEqual( [ 1, undefined, 2 ] );
	} );

	it( 'should return already normalized array unchanged', () => {
		const args = [ 1, 2, 3 ];
		expect( selectorArgsToStateKey( args ) ).toBe( args );
	} );
} );