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'use strict';
const EventEmitter = require('events');
const fnName = require('fn-name');
const Concurrent = require('./concurrent');
const Sequence = require('./sequence');
const Test = require('./test');
class TestCollection extends EventEmitter {
constructor(options) {
super();
this.bail = options.bail;
this.failWithoutAssertions = options.failWithoutAssertions;
this.compareTestSnapshot = options.compareTestSnapshot;
this.hasExclusive = false;
this.testCount = 0;
this.tests = {
concurrent: [],
serial: []
};
this.hooks = {
before: [],
beforeEach: [],
after: [],
afterAlways: [],
afterEach: [],
afterEachAlways: []
};
this.pendingTestInstances = new Set();
this._emitTestResult = this._emitTestResult.bind(this);
}
add(test) {
const metadata = test.metadata;
const type = metadata.type;
if (!type) {
throw new Error('Test type must be specified');
}
if (!test.title && test.fn) {
test.title = fnName(test.fn);
}
// Workaround for Babel giving anonymous functions a name
if (test.title === 'callee$0$0') {
test.title = null;
}
if (!test.title) {
if (type === 'test') {
test.title = '[anonymous]';
} else {
test.title = type;
}
}
if (metadata.always && type !== 'after' && type !== 'afterEach') {
throw new Error('"always" can only be used with after and afterEach hooks');
}
// Add a hook
if (type !== 'test') {
if (metadata.exclusive) {
throw new Error(`"only" cannot be used with a ${type} hook`);
}
this.hooks[type + (metadata.always ? 'Always' : '')].push(test);
return;
}
this.testCount++;
// Add `.only()` tests if `.only()` was used previously
if (this.hasExclusive && !metadata.exclusive) {
return;
}
if (metadata.exclusive && !this.hasExclusive) {
this.tests.concurrent = [];
this.tests.serial = [];
this.hasExclusive = true;
}
if (metadata.serial) {
this.tests.serial.push(test);
} else {
this.tests.concurrent.push(test);
}
}
_skippedTest(test) {
return {
run: () => {
this._emitTestResult({
passed: true,
result: test
});
return true;
}
};
}
_emitTestResult(result) {
this.pendingTestInstances.delete(result.result);
this.emit('test', result);
}
_buildHooks(hooks, testTitle, context) {
return hooks.map(hook => {
const test = this._buildHook(hook, testTitle, context);
if (hook.metadata.skipped || hook.metadata.todo) {
return this._skippedTest(test);
}
return test;
});
}
_buildHook(hook, testTitle, contextRef) {
let title = hook.title;
if (testTitle) {
title += ` for ${testTitle}`;
}
if (!contextRef) {
contextRef = null;
}
const test = new Test({
contextRef,
failWithoutAssertions: false,
fn: hook.fn,
compareTestSnapshot: this.compareTestSnapshot,
metadata: hook.metadata,
onResult: this._emitTestResult,
title
});
this.pendingTestInstances.add(test);
return test;
}
_buildTest(test, contextRef) {
if (!contextRef) {
contextRef = null;
}
test = new Test({
contextRef,
failWithoutAssertions: this.failWithoutAssertions,
fn: test.fn,
compareTestSnapshot: this.compareTestSnapshot,
metadata: test.metadata,
onResult: this._emitTestResult,
title: test.title
});
this.pendingTestInstances.add(test);
return test;
}
_buildTestWithHooks(test) {
if (test.metadata.skipped || test.metadata.todo) {
return new Sequence([this._skippedTest(this._buildTest(test))], true);
}
const context = {context: {}};
const beforeHooks = this._buildHooks(this.hooks.beforeEach, test.title, context);
const afterHooks = this._buildHooks(this.hooks.afterEach, test.title, context);
let sequence = new Sequence([].concat(beforeHooks, this._buildTest(test, context), afterHooks), true);
if (this.hooks.afterEachAlways.length > 0) {
const afterAlwaysHooks = new Sequence(this._buildHooks(this.hooks.afterEachAlways, test.title, context));
sequence = new Sequence([sequence, afterAlwaysHooks], false);
}
return sequence;
}
_buildTests(tests) {
return tests.map(test => this._buildTestWithHooks(test));
}
_hasUnskippedTests() {
return this.tests.serial.concat(this.tests.concurrent)
.some(test => {
return !(test.metadata && test.metadata.skipped === true);
});
}
build() {
const serialTests = new Sequence(this._buildTests(this.tests.serial), this.bail);
const concurrentTests = new Concurrent(this._buildTests(this.tests.concurrent), this.bail);
const allTests = new Sequence([serialTests, concurrentTests]);
let finalTests;
// Only run before and after hooks when there are unskipped tests
if (this._hasUnskippedTests()) {
const beforeHooks = new Sequence(this._buildHooks(this.hooks.before));
const afterHooks = new Sequence(this._buildHooks(this.hooks.after));
finalTests = new Sequence([beforeHooks, allTests, afterHooks], true);
} else {
finalTests = new Sequence([allTests], true);
}
if (this.hooks.afterAlways.length > 0) {
const afterAlwaysHooks = new Sequence(this._buildHooks(this.hooks.afterAlways));
finalTests = new Sequence([finalTests, afterAlwaysHooks], false);
}
return finalTests;
}
attributeLeakedError(err) {
for (const test of this.pendingTestInstances) {
if (test.attributeLeakedError(err)) {
return true;
}
}
return false;
}
}
module.exports = TestCollection;
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