Add test for Runner event order (mochajs#3642)

* runner: basic events test

* tests basic, bail, retries

* delete first test

test/integration/events.spec.js

@@ -0,0 +1,59 @@
+'use strict';
+
+var helpers = require('./helpers');
+var runMochaJSON = helpers.runMochaJSON;
+
+describe('event order', function() {
+  describe('trivial test case', function() {
+    it('should assert trivial event order', function(done) {
+      runMochaJSON('runner/events-basic.fixture.js', [], function(err, res) {
+        if (err) {
+          done(err);
+          return;
+        }
+        expect(res, 'to have passed')
+          .and('to have passed test count', 2)
+          .and('to have passed test order', 'test A', 'test B')
+          .and('to have failed test count', 0);
+        done();
+      });
+    });
+  });
+
+  describe('--bail test case', function() {
+    it('should assert --bail event order', function(done) {
+      runMochaJSON('runner/events-bail.fixture.js', ['--bail'], function(
+        err,
+        res
+      ) {
+        if (err) {
+          done(err);
+          return;
+        }
+        expect(res, 'to have failed with error', 'error test A')
+          .and('to have failed test count', 1)
+          .and('to have passed test count', 0);
+        done();
+      });
+    });
+  });
+
+  describe('--retries test case', function() {
+    it('should assert --retries event order', function(done) {
+      runMochaJSON(
+        'runner/events-retries.fixture.js',
+        ['--retries', '1'],
+        function(err, res) {
+          if (err) {
+            done(err);
+            return;
+          }
+          expect(res, 'to have failed with error', 'error test A')
+            .and('to have failed test count', 1)
+            .and('to have passed test count', 0);
+          done();
+        }
+      );
+    });
+  });
+});

test/integration/fixtures/runner/events-bail.fixture.js

@@ -0,0 +1,29 @@
+'use strict';
+var Runner = require('../../../../lib/runner.js');
+var assert = require('assert');
+
+var emitOrder = [
+  'suite'/* incorrect order*/, 'start', 'suite',
+  'hook', 'hook end', 'test', 'hook', 'hook end', 'fail', 'test end', 'hook', 'hook end',
+  'hook', 'hook end', 'suite end', 'suite end', 'end'
+];
+
+var realEmit = Runner.prototype.emit;
+Runner.prototype.emit = function(event, ...args) {
+  // console.log(`emit: ${event}`);  
+  assert.strictEqual(event, emitOrder.shift());
+  return realEmit.call(this, event, ...args);
+};
+
+describe('suite A', function() {
+  before('before', function() {});
+  beforeEach('beforeEach', function() {});
+  it('test A', function() {
+    throw new Error('error test A');
+  });
+  describe('suite B', function() {
+    it('test B', function() {});
+  });
+  afterEach('afterEach', function() {});
+  after('after', function() {});
+});

test/integration/fixtures/runner/events-basic.fixture.js

@@ -0,0 +1,28 @@
+'use strict';
+var Runner = require('../../../../lib/runner.js');
+var assert = require('assert');
+
+var emitOrder = [
+  'suite'/* incorrect order*/, 'start', 'suite',
+  'hook', 'hook end', 'test', 'hook', 'hook end', 'pass', 'test end', 'hook', 'hook end',
+  'suite', 'test', 'hook', 'hook end', 'pass', 'test end', 'hook', 'hook end',
+  'suite end', 'hook', 'hook end', 'suite end', 'suite end', 'end'
+];
+
+var realEmit = Runner.prototype.emit;
+Runner.prototype.emit = function(event, ...args) {
+  // console.log(`emit: ${event}`);  
+  assert.strictEqual(event, emitOrder.shift());
+  return realEmit.call(this, event, ...args);
+};
+
+describe('suite A', function() {
+  before('before', function() {});
+  beforeEach('beforeEach', function() {});
+  it('test A', function() {});
+  describe('suite B', function() {
+    it('test B', function() {});
+  });
+  afterEach('afterEach', function() {});
+  after('after', function() {});
+});

test/integration/fixtures/runner/events-retries.fixture.js

@@ -0,0 +1,27 @@
+'use strict';
+var Runner = require('../../../../lib/runner.js');
+var assert = require('assert');
+
+var emitOrder = [
+  'suite'/* incorrect order*/, 'start', 'suite',
+  'hook', 'hook end', 'test', 'hook', 'hook end', 'retry', 'hook', 'hook end',
+  'test', 'hook', 'hook end', 'fail', 'test end', 'hook', 'hook end', 'hook', 'hook end',
+  'suite end', 'suite end', 'end'
+];
+
+var realEmit = Runner.prototype.emit;
+Runner.prototype.emit = function(event, ...args) {
+  // console.log(`emit: ${event}`);  
+  assert.strictEqual(event, emitOrder.shift());
+  return realEmit.call(this, event, ...args);
+};
+
+describe('suite A', function() {
+  before('before', function() {});
+  beforeEach('beforeEach', function() {});
+  it('test A', function() {
+    throw new Error('error test A');
+  });
+  afterEach('afterEach', function() {});
+  after('after', function() {});
+});