ng test frequently crashes with "Missing error handler on socket."

[maxfurman]

Please provide us with the following information:

OS?

Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)

OSX El Capitan

Versions.

Please run ng --version. If there's nothing outputted, please run in a Terminal: node --version and paste the result here:

angular-cli: 1.0.0-beta.17
node: 6.8.1
os: darwin x64

Repro steps.

Was this an app that wasn't created using the CLI? What change did you do on your code? etc.

This app was created using the CLI. When I am editing a .spec.ts file while the ng test server is running, it will frequently crash with the error pasted below.

I'm using VSCode and I have it set to autosave changes every few seconds. The crashes seem to occur when the test file has a typo or syntax error at the moment it saves.

The log given by the failure.

Missing error handler on socket.
TypeError: Cannot read property 'set' of null
at KarmaRemapIstanbul.onBrowserComplete (/Users/Max/projects/meal-planner/node_modules/karma-remap-istanbul/index.js:28:16)
at Server. (/Users/Max/projects/meal-planner/node_modules/karma/lib/events.js:13:22)
at emitTwo (events.js:111:20)
at Server.emit (events.js:191:7)
at Browser.onComplete (/Users/Max/projects/meal-planner/node_modules/karma/lib/browser.js:143:13)
at Socket. (/Users/Max/projects/meal-planner/node_modules/karma/lib/events.js:13:22)
at emitTwo (events.js:111:20)
at Socket.emit (events.js:191:7)
at Socket.onevent (/Users/Max/projects/meal-planner/node_modules/socket.io/lib/socket.js:335:8)
at Socket.onpacket (/Users/Max/projects/meal-planner/node_modules/socket.io/lib/socket.js:295:12)
at Client.ondecoded (/Users/Max/projects/meal-planner/node_modules/socket.io/lib/client.js:193:14)
at Decoder.Emitter.emit (/Users/Max/projects/meal-planner/node_modules/component-emitter/index.js:134:20)
at Decoder.add (/Users/Max/projects/meal-planner/node_modules/socket.io-parser/index.js:247:12)
at Client.ondata (/Users/Max/projects/meal-planner/node_modules/socket.io/lib/client.js:175:18)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at Socket.onPacket (/Users/Max/projects/meal-planner/node_modules/engine.io/lib/socket.js:101:14)
at emitOne (events.js:96:13)
at WebSocket.emit (events.js:188:7)
at WebSocket.Transport.onPacket (/Users/Max/projects/meal-planner/node_modules/engine.io/lib/transport.js:104:8)
at WebSocket.Transport.onData (/Users/Max/projects/meal-planner/node_modules/engine.io/lib/transport.js:115:8)
at WebSocket.onData (/Users/Max/projects/meal-planner/node_modules/engine.io/lib/transports/websocket.js:76:30)
at emitTwo (events.js:106:13)
at WebSocket.emit (events.js:191:7)
at Receiver.ontext (/Users/Max/projects/meal-planner/node_modules/engine.io/node_modules/ws/lib/WebSocket.js:816:10)
at /Users/Max/projects/meal-planner/node_modules/engine.io/node_modules/ws/lib/Receiver.js:477:18
at /Users/Max/projects/meal-planner/node_modules/engine.io/node_modules/ws/lib/Receiver.js:361:7
at /Users/Max/projects/meal-planner/node_modules/engine.io/node_modules/ws/lib/PerMessageDeflate.js:247:5
at afterWrite (_stream_writable.js:387:3)
at onwrite (_stream_writable.js:378:7)
at WritableState.onwrite (_stream_writable.js:89:5)
at afterTransform (_stream_transform.js:79:3)
at TransformState.afterTransform (_stream_transform.js:54:12)
at Zlib.callback (zlib.js:639:5)
Chrome 53.0.2785 (Mac OS X 10.11.6) ERROR
Disconnectedundefined

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[filipesilva]

Heya, this is roughly a duplicate of #2640, which #2785 together with #2840 should fix.

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