chore(deps): update log4js requirement from ~3.0.0 to ~4.0.2 (#1359)

* chore(deps): update log4js requirement from ~3.0.0 to ~4.0.2

Updates the requirements on [log4js](https://github.com/log4js-node/log4js-node) to permit the latest version.
- [Release notes](https://github.com/log4js-node/log4js-node/releases)
- [Changelog](https://github.com/log4js-node/log4js-node/blob/master/docs/v3-changes.md)
- [Commits](https://github.com/log4js-node/log4js-node/commits/v4.0.2)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* test(child process proxy): update tests of child process proxy to use flatted

Author: dependabot[bot]

packages/stryker/package.json

@@ -62,7 +62,7 @@
     "inquirer": "~6.2.0",
     "istanbul-lib-instrument": "~3.1.0",
     "lodash": "~4.17.4",
-    "log4js": "~3.0.0",
+    "log4js": "~4.0.2",
     "mkdirp": "~0.5.1",
     "prettier": "~1.16.1",
     "progress": "~2.0.0",
@@ -83,6 +83,7 @@
     "@types/node": "~10.11.4",
     "@types/prettier": "^1.15.2",
     "@types/progress": "~2.0.1",
+    "flatted": "^2.0.0",
     "stryker-api": "^0.24.0"
   },
   "peerDependencies": {

packages/stryker/test/helpers/LoggingServer.ts

@@ -1,6 +1,7 @@
 import * as net from 'net';
 import * as log4js from 'log4js';
 import { Subscriber, Observable } from 'rxjs';
+import { parse } from 'flatted';
 
 export default class LoggingServer {
 
@@ -14,7 +15,7 @@ export default class LoggingServer {
       socket.on('data', data => {
         // Log4js also sends "__LOG4JS__" to signal an event end. Ignore those.
         const logEventStrings = data.toString().split('__LOG4JS__').filter(Boolean);
-        const loggingEvents: log4js.LoggingEvent[] = logEventStrings.map(logEventString => JSON.parse(logEventString));
+        const loggingEvents: log4js.LoggingEvent[] = logEventStrings.map(logEventString => parse(logEventString));
         loggingEvents.forEach(event => this.subscriber && this.subscriber.next(event));
       });
       socket.on('error', () => {

packages/stryker/test/integration/child-proxy/ChildProcessProxy.it.ts

@@ -16,7 +16,8 @@ import OutOfMemoryError from '../../../src/child-proxy/OutOfMemoryError';
 import ChildProcessCrashedError from '../../../src/child-proxy/ChildProcessCrashedError';
 import { testInjector } from '@stryker-mutator/test-helpers';
 import { commonTokens } from 'stryker-api/plugin';
-describe('ChildProcessProxy', () => {
+
+describe(ChildProcessProxy.name, () => {
 
   let sut: ChildProcessProxy<Echo>;
   let loggingServer: LoggingServer;