reducer.js
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/*
*
* ADOBE CONFIDENTIAL
* __________________
*
* Copyright 2016 Adobe Systems Incorporated
* All Rights Reserved.
*
* NOTICE: All information contained herein is, and remains
* the property of Adobe Systems Incorporated and its suppliers,
* if any. The intellectual and technical concepts contained
* herein are proprietary to Adobe Systems Incorporated and its
* suppliers and are protected by trade secret or copyright law.
* Dissemination of this information or reproduction of this material
* is strictly forbidden unless prior written permission is obtained
* from Adobe Systems Incorporated.
*/
/* globals expect, it */
define('screens/player/shared/test-helper/reducer', [], function() {
'use strict';
/**
* A Test Helper that provide utility methods to run reducer tests.
*
* @param {Reducer} [reducer] The reducer to run tests against
* @returns {Object} The reducer Test Helper
*/
return function(reducer) {
var _testActionTypesExist = function(actions) {
var actionsArray = Array.prototype.concat(actions);
for (var i = 0; i < actionsArray.length; i++) {
var action = actionsArray[i];
it('action is a string', function() {
expect(action.type).to.be.a('string');
});
}
};
var _testMutability = function(actions, initialState) {
var actionsArray = Array.prototype.concat(actions);
for (var i = 0; i < actionsArray.length; i++) {
var action = actionsArray[i];
it('reducer must not mutate the state on state change with action ' + action.type, function() {
var newState = reducer(initialState, action);
expect(initialState === newState).to.be.false;
});
}
};
var _testNonMutability = function(initialState) {
it('reducer must return the state if no action', function() {
var newState = reducer(initialState, {
type: 'ANOTHER_ACTION'
});
expect(initialState === newState).to.be.true;
});
};
/**
* A helper object to run unit tests on a reducer.
* @class ReducerTestHelper
*/
return {
/**
* Runs the default standard reducer tests (state mutability in case of action, state non mutability...).
* @memberof ReducerTestHelper
* @param {Object|Array} actions The reducer supported dispatched action(s). Action(s) should be triggering a state change. Supports one action and an array of actions.
* @param {Object} [initialState] Initial state to be provided to the reducer.
*/
runDefaultTests: function(actions, initialState) {
_testActionTypesExist(actions);
_testMutability(actions, initialState);
_testNonMutability(initialState);
},
/**
* Runs a state comparison test.
* @memberof ReducerTestHelper
* @param {String} testName Name of the test.
* @param {Object} action Action to dispatch to the reducer.
* @param {Object} initialState Initial state to be provided to the reducer.
* @param {Object} newState The expected state returned by the reducer (deep compare).
*/
runCompareStateTest: function(testName, action, initialState, newState) {
it(testName, function() {
var state = reducer(initialState, action);
expect(state).to.deep.equal(newState);
});
},
/**
* Runs a state change test.
* @memberof ReducerTestHelper
* @param {String} testName Name of the test.
* @param {Object} setterAction Action to dispatch to the reducer.
*/
runSetterPayloadTest: function(testName, setterAction) {
this.runCompareStateTest(testName, {
type: setterAction,
payload: {
p1: 'v1',
p2: {
p21: 'v21'
}
}
}, {
p1: 'ov1',
p3: {
p31: 'ov31'
}
}, {
p1: 'v1',
p2: {
p21: 'v21'
}
});
},
/**
* Runs a state update test.
* @memberof ReducerTestHelper
* @param {String} testName Name of the test.
* @param {Object} updaterAction Action to dispatch to the reducer.
*/
runUpdaterPayloadTest: function(testName, updaterAction) {
this.runCompareStateTest(testName, {
type: updaterAction,
payload: {
p1: 'v1',
p2: {
p21: 'v21'
}
}
}, {
p1: 'ov1',
p3: {
p31: 'ov31'
}
}, {
p1: 'v1',
p2: {
p21: 'v21'
},
p3: {
p31: 'ov31'
}
});
}
};
};
});