do not eat exceptions thrown asynchronously from passed tests; closes #3226

lib/reporters/base.js

@@ -302,7 +302,7 @@ function Base (runner) {
     failures.push(test);
   });
 
-  runner.on('end', function () {
+  runner.once('end', function () {
     stats.end = new Date();
     stats.duration = stats.end - stats.start;
   });

lib/reporters/dot.js

@@ -56,7 +56,7 @@ function Dot (runner) {
     process.stdout.write(color('fail', Base.symbols.bang));
   });
 
-  runner.on('end', function () {
+  runner.once('end', function () {
     console.log();
     self.epilogue();
   });

lib/reporters/json-stream.js

@@ -39,7 +39,7 @@ function List (runner) {
     console.log(JSON.stringify(['fail', test]));
   });
 
-  runner.on('end', function () {
+  runner.once('end', function () {
     process.stdout.write(JSON.stringify(['end', self.stats]));
   });
 }

lib/reporters/json.js

@@ -43,7 +43,7 @@ function JSONReporter (runner) {
     pending.push(test);
   });
 
-  runner.on('end', function () {
+  runner.once('end', function () {
     var obj = {
       stats: self.stats,
       tests: tests.map(clean),

lib/reporters/landing.js

@@ -81,7 +81,7 @@ function Landing (runner) {
     stream.write('\u001b[0m');
   });
 
-  runner.on('end', function () {
+  runner.once('end', function () {
     cursor.show();
     console.log();
     self.epilogue();

lib/reporters/list.js

@@ -54,7 +54,7 @@ function List (runner) {
     console.log(color('fail', '  %d) %s'), ++n, test.fullTitle());
   });
 
-  runner.on('end', self.epilogue.bind(self));
+  runner.once('end', self.epilogue.bind(self));
 }
 
 /**

lib/reporters/markdown.js

@@ -91,7 +91,7 @@ function Markdown (runner) {
     buf += '```\n\n';
   });
 
-  runner.on('end', function () {
+  runner.once('end', function () {
     process.stdout.write('# TOC\n');
     process.stdout.write(generateTOC(runner.suite));
     process.stdout.write(buf);

lib/reporters/min.js

@@ -29,7 +29,7 @@ function Min (runner) {
     process.stdout.write('\u001b[1;3H');
   });
 
-  runner.on('end', this.epilogue.bind(this));
+  runner.once('end', this.epilogue.bind(this));
 }
 
 /**

lib/reporters/nyan.js

@@ -52,7 +52,7 @@ function NyanCat (runner) {
     self.draw();
   });
 
-  runner.on('end', function () {
+  runner.once('end', function () {
     Base.cursor.show();
     for (var i = 0; i < self.numberOfLines; i++) {
       write('\n');

lib/reporters/progress.js

@@ -80,7 +80,7 @@ function Progress (runner, options) {
 
   // tests are complete, output some stats
   // and the failures if any
-  runner.on('end', function () {
+  runner.once('end', function () {
     cursor.show();
     console.log();
     self.epilogue();

lib/reporters/spec.js

@@ -72,7 +72,7 @@ function Spec (runner) {
     console.log(indent() + color('fail', '  %d) %s'), ++n, test.title);
   });
 
-  runner.on('end', self.epilogue.bind(self));
+  runner.once('end', self.epilogue.bind(self));
 }
 
 /**

lib/reporters/tap.js

@@ -51,7 +51,7 @@ function TAP (runner) {
     }
   });
 
-  runner.on('end', function () {
+  runner.once('end', function () {
     console.log('# tests ' + (passes + failures));
     console.log('# pass ' + passes);
     console.log('# fail ' + failures);

lib/reporters/xunit.js

@@ -78,7 +78,7 @@ function XUnit (runner, options) {
     tests.push(test);
   });
 
-  runner.on('end', function () {
+  runner.once('end', function () {
     self.write(tag('testsuite', {
       name: suiteName,
       tests: stats.tests,

lib/runnable.js

@@ -142,6 +142,24 @@ Runnable.prototype.isPending = function () {
   return this.pending || (this.parent && this.parent.isPending());
 };
 
+/**
+ * Return `true` if this Runnable has failed.
+ * @return {boolean}
+ * @private
+ */
+Runnable.prototype.isFailed = function () {
+  return !this.isPending() && this.state === 'failed';
+};
+
+/**
+ * Return `true` if this Runnable has passed.
+ * @return {boolean}
+ * @private
+ */
+Runnable.prototype.isPassed = function () {
+  return !this.isPending() && this.state === 'passed';
+};
+
 /**
  * Set or get number of retries.
  *

lib/runner.js

@@ -726,21 +726,25 @@ Runner.prototype.uncaught = function (err) {
 
   runnable.clearTimeout();
 
-  // Ignore errors if complete or pending
-  if (runnable.state || runnable.isPending()) {
+  // Ignore errors if already failed or pending
+  // See #3226
+  if (runnable.isFailed() || runnable.isPending()) {
     return;
   }
+  // we cannot recover gracefully if a Runnable has already passed
+  // then fails asynchronously
+  var alreadyPassed = runnable.isPassed();
+  // this will change the state to "failed" regardless of the current value
   this.fail(runnable, err);
+  if (!alreadyPassed) {
+    // recover from test
+    if (runnable.type === 'test') {
+      this.emit('test end', runnable);
+      this.hookUp('afterEach', this.next);
+      return;
+    }
 
-  // recover from test
-  if (runnable.type === 'test') {
-    this.emit('test end', runnable);
-    this.hookUp('afterEach', this.next);
-    return;
-  }
-
-  // recover from hooks
-  if (runnable.type === 'hook') {
+    // recover from hooks
     var errSuite = this.suite;
     // if hook failure is in afterEach block
     if (runnable.fullTitle().indexOf('after each') > -1) {

test/integration/fixtures/uncaught-fatal.fixture.js

@@ -0,0 +1,11 @@
+'use strict';
+
+it('should bail if a successful test asynchronously fails', function(done) {
+  done();
+  process.nextTick(function () {
+    throw new Error('global error');
+  });
+});
+
+it('should not actually get run', function () {
+});

test/integration/uncaught.spec.js

@@ -40,4 +40,24 @@ describe('uncaught exceptions', function () {
       done();
     });
   });
+
+  it('handles uncaught exceptions from which Mocha cannot recover', function (done) {
+    run('uncaught-fatal.fixture.js', args, function (err, res) {
+      if (err) {
+        done(err);
+        return;
+      }
+      assert.equal(res.stats.pending, 0);
+      assert.equal(res.stats.passes, 1);
+      assert.equal(res.stats.failures, 1);
+
+      assert.equal(res.failures[0].title,
+        'should bail if a successful test asynchronously fails');
+      assert.equal(res.passes[0].title,
+        'should bail if a successful test asynchronously fails');
+
+      assert.equal(res.code, 1);
+      done();
+    });
+  });
 });

test/reporters/doc.spec.js

@@ -6,9 +6,10 @@ var Doc = reporters.Doc;
 describe('Doc reporter', function () {
   var stdout;
   var stdoutWrite;
-  var runner = {};
+  var runner;
   beforeEach(function () {
     stdout = [];
+    runner = {};
     stdoutWrite = process.stdout.write;
     process.stdout.write = function (string) {
       stdout.push(string);
@@ -24,7 +25,7 @@ describe('Doc reporter', function () {
         title: expectedTitle
       };
       it('should log html with indents and expected title', function () {
-        runner.on = function (event, callback) {
+        runner.on = runner.once = function (event, callback) {
           if (event === 'suite') {
             callback(suite);
           }
@@ -44,7 +45,7 @@ describe('Doc reporter', function () {
           title: unescapedTitle
         };
         expectedTitle = '<div>' + expectedTitle + '</div>';
-        runner.on = function (event, callback) {
+        runner.on = runner.once = function (event, callback) {
           if (event === 'suite') {
             callback(suite);
           }
@@ -64,7 +65,7 @@ describe('Doc reporter', function () {
         root: true
       };
       it('should not log any html', function () {
-        runner.on = function (event, callback) {
+        runner.on = runner.once = function (event, callback) {
           if (event === 'suite') {
             callback(suite);
           }
@@ -82,7 +83,7 @@ describe('Doc reporter', function () {
         root: false
       };
       it('should log expected html with indents', function () {
-        runner.on = function (event, callback) {
+        runner.on = runner.once = function (event, callback) {
           if (event === 'suite end') {
             callback(suite);
           }
@@ -100,7 +101,7 @@ describe('Doc reporter', function () {
         root: true
       };
       it('should not log any html', function () {
-        runner.on = function (event, callback) {
+        runner.on = runner.once = function (event, callback) {
           if (event === 'suite end') {
             callback(suite);
           }
@@ -123,7 +124,7 @@ describe('Doc reporter', function () {
       }
     };
     it('should log html with indents and expected title and body', function () {
-      runner.on = function (event, callback) {
+      runner.on = runner.once = function (event, callback) {
         if (event === 'pass') {
           callback(test);
         }
@@ -144,7 +145,7 @@ describe('Doc reporter', function () {
 
       var expectedEscapedTitle = '<div>' + expectedTitle + '</div>';
       var expectedEscapedBody = '<div>' + expectedBody + '</div>';
-      runner.on = function (event, callback) {
+      runner.on = runner.once = function (event, callback) {
         if (event === 'pass') {
           callback(test);
         }
@@ -171,7 +172,7 @@ describe('Doc reporter', function () {
       }
     };
     it('should log html with indents and expected title, body and error', function () {
-      runner.on = function (event, callback) {
+      runner.on = runner.once = function (event, callback) {
         if (event === 'fail') {
           callback(test, expectedError);
         }
@@ -195,7 +196,7 @@ describe('Doc reporter', function () {
       var expectedEscapedTitle = '<div>' + expectedTitle + '</div>';
       var expectedEscapedBody = '<div>' + expectedBody + '</div>';
       var expectedEscapedError = '<div>' + expectedError + '</div>';
-      runner.on = function (event, callback) {
+      runner.on = runner.once = function (event, callback) {
         if (event === 'fail') {
           callback(test, unescapedError);
         }

test/reporters/dot.spec.js

@@ -31,7 +31,7 @@ describe('Dot reporter', function () {
 
   describe('on start', function () {
     it('should return a new line', function () {
-      runner.on = function (event, callback) {
+      runner.on = runner.once = function (event, callback) {
         if (event === 'start') {
           callback();
         }
@@ -50,7 +50,7 @@ describe('Dot reporter', function () {
         Base.window.width = 2;
       });
       it('should return a new line and then a coma', function () {
-        runner.on = function (event, callback) {
+        runner.on = runner.once = function (event, callback) {
           if (event === 'pending') {
             callback();
           }
@@ -66,7 +66,7 @@ describe('Dot reporter', function () {
     });
     describe('if window width is equal to or less than 1', function () {
       it('should return a coma', function () {
-        runner.on = function (event, callback) {
+        runner.on = runner.once = function (event, callback) {
           if (event === 'pending') {
             callback();
           }
@@ -91,7 +91,7 @@ describe('Dot reporter', function () {
             duration: 1,
             slow: function () { return 2; }
           };
-          runner.on = function (event, callback) {
+          runner.on = runner.once = function (event, callback) {
             if (event === 'pass') {
               callback(test);
             }
@@ -113,7 +113,7 @@ describe('Dot reporter', function () {
             duration: 1,
             slow: function () { return 2; }
           };
-          runner.on = function (event, callback) {
+          runner.on = runner.once = function (event, callback) {
             if (event === 'pass') {
               callback(test);
             }
@@ -132,7 +132,7 @@ describe('Dot reporter', function () {
             duration: 2,
             slow: function () { return 1; }
           };
-          runner.on = function (event, callback) {
+          runner.on = runner.once = function (event, callback) {
             if (event === 'pass') {
               callback(test);
             }
@@ -158,7 +158,7 @@ describe('Dot reporter', function () {
             err: 'some error'
           }
         };
-        runner.on = function (event, callback) {
+        runner.on = runner.once = function (event, callback) {
           if (event === 'fail') {
             callback(test);
           }
@@ -179,7 +179,7 @@ describe('Dot reporter', function () {
             err: 'some error'
           }
         };
-        runner.on = function (event, callback) {
+        runner.on = runner.once = function (event, callback) {
           if (event === 'fail') {
             callback(test);
           }
@@ -195,7 +195,7 @@ describe('Dot reporter', function () {
   });
   describe('on end', function () {
     it('should call the epilogue', function () {
-      runner.on = function (event, callback) {
+      runner.on = runner.once = function (event, callback) {
         if (event === 'end') {
           callback();
         }