state-tree: add timezones reducer tests

client/state/timezones/test/reducer.js

@@ -0,0 +1,112 @@
+/**
+ * External dependencies
+ */
+import { expect } from 'chai';
+import deepFreeze from 'deep-freeze';
+
+/**
+ * Internal dependencies
+ */
+import { useSandbox } from 'test/helpers/use-sinon';
+import timezonesReducer, { items as itemsReducer } from '../reducer';
+import { timezonesReceiveAction } from '../actions';
+import { fromApi } from 'state/data-layer/wpcom/timezones';
+
+/**
+ * Fixture data
+ */
+import { TIMEZONES_SYNC_DATA } from './fixture';
+
+describe( 'reducer', () => {
+	let sandbox;
+
+	useSandbox( newSandbox => {
+		sandbox = newSandbox;
+		sandbox.stub( console, 'warn' );
+	} );
+
+	it( 'should export expected reducer keys', () => {
+		expect( timezonesReducer( undefined, {} ) ).to.have.keys( [
+			'items'
+		] );
+	} );
+
+	describe( '#items()', () => {
+		it( 'should default to an empty Object', () => {
+			expect( itemsReducer( undefined, {} ) ).to.eql( {
+				rawOffsets: [],
+				timezonesByContinent: {}
+			} );
+		} );
+
+		it( 'should index items state', () => {
+			const initialState = undefined;
+			const timezones = fromApi( TIMEZONES_SYNC_DATA );
+			const action = timezonesReceiveAction( timezones );
+
+			const expectedState = timezones;
+
+			const newState = itemsReducer( initialState, action );
+
+			expect( newState ).to.eql( expectedState );
+		} );
+
+		it( 'should override timezones', () => {
+			const timezones = fromApi( {
+				timezones_by_continent: {
+					Dame: [ 'el', 'fuego' ]
+				}
+			} );
+			const initialState = timezones;
+
+			const action = timezonesReceiveAction( fromApi( TIMEZONES_SYNC_DATA ) );
+			const expectedState = fromApi( TIMEZONES_SYNC_DATA );
+
+			deepFreeze( initialState );
+
+			const newState = itemsReducer( initialState, action );
+
+			expect( newState ).to.eql( expectedState );
+		} );
+
+		it( 'should persist state', () => {
+			const timezones = fromApi( TIMEZONES_SYNC_DATA );
+			const initialState = timezones;
+			const action = { type: 'SERIALIZE' };
+			const expectedState = timezones;
+
+			deepFreeze( initialState );
+
+			const newState = itemsReducer( initialState, action );
+
+			expect( newState ).to.eql( expectedState );
+		} );
+
+		it( 'should load persisted state', () => {
+			const timezones = fromApi( TIMEZONES_SYNC_DATA );
+			const initialState = timezones;
+			const action = { type: 'DESERIALIZE' };
+			const expectedState = timezones;
+
+			deepFreeze( initialState );
+
+			const newState = itemsReducer( initialState, action );
+
+			expect( newState ).to.eql( expectedState );
+		} );
+
+		it( 'should not load invalid persisted state', () => {
+			const timezones = { foo: 'bar' };
+			const initialState = timezones;
+			const action = { type: 'DESERIALIZE' };
+			deepFreeze( initialState );
+
+			const newState = itemsReducer( initialState, action );
+
+			expect( newState ).to.eql( {
+				rawOffsets: [],
+				timezonesByContinent: {}
+			} );
+		} );
+	} );
+} );