Schema Compare tests addition (#5136)

* initial tests for schema compare

* Adding schema compare integration test

* Adding code to fix some build issues

* DB compare test

* Adding some CR comments

* db creation and deletion as per CR comments

extensions/schema-compare/package.json

@@ -48,5 +48,11 @@
     "vscode-extension-telemetry": "0.0.18",
     "vscode-nls": "^3.2.1"
   },
-  "devDependencies": {}
+  "devDependencies": {
+    "@types/mocha": "^5.2.5",
+		"@types/node": "^8.0.24",
+		"mocha": "^5.2.0",
+		"should": "^13.2.1",
+		"typemoq": "^2.1.0"
+  }
 }