test: add test for fixed side effects

test/connector-client.spec.ts

@@ -32,6 +32,7 @@ import * as chai from 'chai';
 import {expect} from 'chai';
 import * as chaiAsPromised from 'chai-as-promised';
 import * as chaiSpies from 'chai-spies';
+import clone = require('fast-clone');
 import {readdir, readFile} from 'fs';
 import {suite, test} from 'mocha-typescript';
 import * as moment from 'moment';
@@ -66,7 +67,7 @@ const httpClient = new HttpClient();
  */
 function doesContainThings<T extends SCThingWithoutReferences>(thing: T): boolean {
   /* tslint:disable-next-line:only-arrow-functions */
-  return traverse(thing).reduce(function(sum, item) {
+  return traverse(thing).reduce(function (sum, item) {
     if (this.isRoot) {
       return false;
     }
@@ -348,16 +349,30 @@ export class ConnectorClientSpec {
     const testInstances = await asyncPool(5, testFiles, async (testFile) => {
       const buffer = await readFilePromisified(join(pathToTestFiles, testFile));
       const content = JSON.parse(buffer.toString());
+
       return content.instance;
     });
 
     for (const testInstance of testInstances) {
+
+      const checkInstance = clone(testInstance);
       const testInstanceWithoutReferences = ConnectorClient.removeReferences(testInstance);
-      expect(doesContainThings(testInstanceWithoutReferences)).to.be.equal(false, JSON.stringify(
-        [testInstance, testInstanceWithoutReferences],
-        null,
-        2,
-      ));
+
+      expect(doesContainThings(testInstanceWithoutReferences)).to.be
+        .equal(false, JSON.stringify(
+          [testInstance, testInstanceWithoutReferences],
+          null,
+          2,
+        ));
+      expect((testInstanceWithoutReferences as any).origin).to.be
+        .equal(undefined, JSON.stringify(
+          [testInstance, testInstanceWithoutReferences],
+          null,
+          2,
+        ));
+      expect(testInstance).to.be.deep
+        .equal(checkInstance,
+          'Removing the references of a thing could have side effects because no deep copy is used');
     }
   }