uncaughtException: fix when current test is pending (#4083)

lib/runner.js

@@ -794,6 +794,10 @@ Runner.prototype.uncaught = function(err) {
   if (err instanceof Pending) {
     return;
   }
+  if (this.allowUncaught) {
+    throw err;
+  }
+
   if (err) {
     debug('uncaught exception %O', err);
   } else {
@@ -829,11 +833,17 @@ Runner.prototype.uncaught = function(err) {
 
   runnable.clearTimeout();
 
-  // Ignore errors if already failed or pending
-  // See #3226
-  if (runnable.isFailed() || runnable.isPending()) {
+  if (runnable.isFailed()) {
+    // Ignore error if already failed
+    return;
+  } else if (runnable.isPending()) {
+    // report 'pending test' retrospectively as failed
+    runnable.isPending = alwaysFalse;
+    this.fail(runnable, err);
+    delete runnable.isPending;
     return;
   }
+
   // we cannot recover gracefully if a Runnable has already passed
   // then fails asynchronously
   var alreadyPassed = runnable.isPassed();

test/integration/fixtures/options/allow-uncaught/propagate.fixture.js

@@ -0,0 +1,12 @@
+'use strict';
+
+describe('Uncaught exception - throw and exit', () => {
+  it('test1', () => {
+    setTimeout(() => {
+      throw new Error('Uncaught error after test1');
+    }, 1);
+  });
+  it('test2', function () { });
+  it('test3', function () { });
+  it('test4', function () { });
+});

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

@@ -0,0 +1,15 @@
+'use strict';
+
+describe('Uncaught exception within pending test', () => {
+  it('test1', function () { });
+
+  it('test2', function () {
+    process.nextTick(function () {
+      throw new Error('I am uncaught!');
+    });
+    this.skip();
+  });
+
+  it('test3 - should run', function () { });
+  it('test4 - should run', function () { });
+});

test/integration/options/allowUncaught.spec.js

@@ -2,11 +2,32 @@
 
 var path = require('path').posix;
 var helpers = require('../helpers');
+var runMocha = helpers.runMocha;
 var runMochaJSON = helpers.runMochaJSON;
 
 describe('--allow-uncaught', function() {
   var args = ['--allow-uncaught'];
 
+  it('should throw an uncaught error and exit process', function(done) {
+    var fixture = path.join('options', 'allow-uncaught', 'propagate');
+    runMocha(
+      fixture,
+      args,
+      function(err, res) {
+        if (err) {
+          return done(err);
+        }
+
+        expect(res.code, 'to be greater than', 0);
+        expect(res.output, 'to contain', 'Error: Uncaught error after test1');
+        expect(res.passing, 'to be', 0);
+        expect(res.failing, 'to be', 0);
+        done();
+      },
+      {stdio: 'pipe'}
+    );
+  });
+
   it('should run with conditional `this.skip()`', function(done) {
     var fixture = path.join('options', 'allow-uncaught', 'this-skip-it');
     runMochaJSON(fixture, args, function(err, res) {

test/integration/uncaught.spec.js

@@ -63,4 +63,27 @@ describe('uncaught exceptions', function() {
       done();
     });
   });
+
+  it('handles uncaught exceptions within pending tests', function(done) {
+    run('uncaught-pending.fixture.js', args, function(err, res) {
+      if (err) {
+        return done(err);
+      }
+
+      expect(res, 'to have failed')
+        .and('to have passed test count', 3)
+        .and('to have pending test count', 1)
+        .and('to have failed test count', 1)
+        .and(
+          'to have passed test',
+          'test1',
+          'test3 - should run',
+          'test4 - should run'
+        )
+        .and('to have pending test order', 'test2')
+        .and('to have failed test', 'test2');
+
+      done();
+    });
+  });
 });

test/unit/runner.spec.js

@@ -811,9 +811,9 @@ describe('Runner', function() {
               sandbox.stub(runnable, 'isPending').returns(true);
             });
 
-            it('should not attempt to fail', function() {
+            it('should attempt to fail', function() {
               runner.uncaught(err);
-              expect(runner.fail, 'was not called');
+              expect(runner.fail, 'was called once');
             });
           });