fix(deps): Report fails without emit 'test end' event (#223)

* Report fails without emit 'test end' event

The mocha listens for 'test end' event (it can restart test if it is
failed). If an exception is thrown from the setup/beforeEach, the
karma-mocha must not fire 'test end' event, because it leads to
exception inside mocha code (the mocha tries to get current test,
which is undefined).

With this, mocha adapter reports fail directly to karma instead of
raising an intermediate 'test end' event.

* test: 'fail' hook doesn't emit 'test end' event

src/adapter.js

@@ -80,6 +80,41 @@ var haveMochaConfig = function (karma) {
   return karma.config && karma.config.mocha
 }
 
+var reportTestResult = function (karma, test) {
+  var skipped = test.pending === true
+
+  var result = {
+    id: '',
+    description: test.title,
+    suite: [],
+    success: test.state === 'passed',
+    skipped: skipped,
+    pending: skipped,
+    time: skipped ? 0 : test.duration,
+    log: test.$errors || [],
+    assertionErrors: test.$assertionErrors || [],
+    startTime: test.$startTime,
+    endTime: Date.now()
+  }
+
+  var pointer = test.parent
+  while (!pointer.root) {
+    result.suite.unshift(pointer.title)
+    pointer = pointer.parent
+  }
+
+  if (haveMochaConfig(karma) && karma.config.mocha.expose && karma.config.mocha.expose.forEach) {
+    result.mocha = {}
+    karma.config.mocha.expose.forEach(function (prop) {
+      if (test.hasOwnProperty(prop)) {
+        result.mocha[prop] = test[prop]
+      }
+    })
+  }
+
+  karma.result(result)
+}
+
 var createMochaReporterConstructor = function (tc, pathname) {
   var isDebugPage = /debug.html$/.test(pathname)
 
@@ -129,46 +164,15 @@ var createMochaReporterConstructor = function (tc, pathname) {
       if (test.type === 'hook') {
         test.$errors = isDebugPage ? [error] : [simpleError]
         test.$assertionErrors = assertionError ? [assertionError] : []
-        runner.emit('test end', test)
+        reportTestResult(tc, test)
       } else {
         test.$errors.push(isDebugPage ? error : simpleError)
         if (assertionError) test.$assertionErrors.push(assertionError)
       }
     })
 
     runner.on('test end', function (test) {
-      var skipped = test.pending === true
-
-      var result = {
-        id: '',
-        description: test.title,
-        suite: [],
-        success: test.state === 'passed',
-        skipped: skipped,
-        pending: skipped,
-        time: skipped ? 0 : test.duration,
-        log: test.$errors || [],
-        assertionErrors: test.$assertionErrors || [],
-        startTime: test.$startTime,
-        endTime: Date.now()
-      }
-
-      var pointer = test.parent
-      while (!pointer.root) {
-        result.suite.unshift(pointer.title)
-        pointer = pointer.parent
-      }
-
-      if (haveMochaConfig(tc) && tc.config.mocha.expose && tc.config.mocha.expose.forEach) {
-        result.mocha = {}
-        tc.config.mocha.expose.forEach(function (prop) {
-          if (test.hasOwnProperty(prop)) {
-            result.mocha[prop] = test[prop]
-          }
-        })
-      }
-
-      tc.result(result)
+      reportTestResult(tc, test)
     })
   }
 }

test/src/adapter.spec.js

@@ -290,6 +290,21 @@ describe('adapter mocha', function () {
         expect(tc.result.called).to.eq(true)
       })
 
+      it('should not emit test end on hook failure', function () {
+        const testEndStub = sandbox.stub()
+        runner.on('test end', testEndStub)
+
+        var mockMochaHook = {
+          type: 'hook',
+          title: 'scenario "before each" hook',
+          parent: {title: 'desc1', root: true}
+        }
+
+        runner.emit('hook', mockMochaHook)
+        runner.emit('fail', mockMochaHook, {message: 'hook failed'})
+        expect(testEndStub.called).to.eq(false)
+      })
+
       it('should end the test only once on uncaught exceptions', function () {
         sandbox.stub(tc, 'result', function (result) {
           expect(result.success).to.to.eql(false)