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/**
* Creates instance of test.
*
* @class
* @classdesc Test case data structure which contains its current state and steps.
* @name Test
* @prop {boolean} [isChanged=false] - Flag whether test case is changed,
* for example, after step addition.
* @prop {object} [state={}] - Current test case state.
* @prop {Step[]} [steps=[]] - Test case steps.
* @prop {string[]} [incomplete=[]] - Test case incompletenesses.
*/
var _ = require("lodash");
var isSub = require("./utils").isSub;
var CONF = require("./config");
var Test = function () {
this.isChanged = false;
this.state = {};
this.steps = [];
this.incomplete = [];
this.weight = 0;
};
/**
* Detects whether it's possible to add step to test case or no.
*
* @method
* @arg {Step} step - Step to check.
* @return {boolean} `true` if it's possible, `false` otherwise.
*/
Test.prototype.mayAdd = function (step) {
/* add step if it should after last step in test */
Iif (this.steps.length &&
this.steps[this.steps.length - 1].name === step.after) {
return true;
};
Iif (this.steps.length &&
this.steps[this.steps.length - 1].before === step.name) {
return true;
};
/* don't add step if test case is finished */
if (this.state === null && this.steps.length) return false;
/* don't add step if its limit is exhausted */
if (this._amount(step) >= (CONF.gen.stepsUsage || step.usage)) return false;
/* if step has completeness it should be matches test incompleteness */
Iif (step.complete) {
var isEqual = true;
var i = 0;
var incomplete = _.clone(this.incomplete).reverse();
for (var cmpl of step.complete) {
var testCmpl = incomplete[i++];
if (cmpl !== testCmpl) {
isEqual = false;
break;
};
};
if (!isEqual) return false;
};
return isSub(this.state, step.income || {});
};
/**
* Adds step to test case.
*
* @method
* @arg {Step} step - Added step.
*/
Test.prototype.add = function (step) {
this.steps.push(step);
this.isChanged = true;
/**
* Don't merge states, if there were steps before addition and state is
* finished. It means, that this step was added explicitly via keywords
* `before` or `after`.
*/
Iif (this.state === null && this.steps.length > 1) return;
var outcome = step.outcome === undefined ? {} : step.outcome;
if (_.isObject(this.state) && _.isObject(outcome)) {
_.merge(this.state, outcome);
} else {
this.state = outcome;
};
Iif (step.complete) {
this.incomplete = this.incomplete.slice(-this.incomplete.length,
this.incomplete.length - step.complete.length);
};
Iif (step.incomplete) {
this.incomplete = this.incomplete.concat(step.incomplete);
};
var weight = step.weight;
Iif (Test.pretrain) {
var x = 0;
var prevStep = _.nth(this.steps, -2);
if (prevStep) x += (Test.pretrain[prevStep.name + " | " + step.name] || 0);
var prevPrevStep = _.nth(this.steps, -3);
if (prevPrevStep) x += (Test.pretrain[prevPrevStep.name + " | " + prevStep.name + " | " + step.name] || 0);
if (x > 0) weight *= (1 + activate(x));
};
this.weight = _.round(this.weight + weight, 3);
};
var activate = x => (Math.exp(x) - Math.exp(-x)) / (Math.exp(x) + Math.exp(-x));
/**
* Clones test case.
*
* @method
* @return {Test} New instance of test with the same parameters.
*/
Test.prototype.clone = function () {
var c = new this.constructor();
c.isChanged = this.isChanged;
c.state = _.cloneDeep(this.state);
c.steps = this.steps.map(s => s.clone());
c.incomplete = _.clone(this.incomplete);
c.weight = this.weight;
return c;
};
/**
* Commits test case and flushes changes state.
*
* @method
*/
Test.prototype.commit = function () {
this.isChanged = false;
};
/**
* Calculates number of step usage in test case.
*
* @method
* @arg {Step} step - Step which usage is calculated in test case.
* @return {number} Number of step usage.
*/
Test.prototype._amount = function (step) {
return this.steps.filter(s => s.name === step.name).length;
};
module.exports = Test;
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