Expose DatabaseAdapter to simplify application tests (#1121)

* Move helper.clearData to DatabaseAdapter. Expose DatabaseAdapter in index

* fix indentation

* Export DatabaseAdapter in index.js

* Rename clearData to destroyAllDataPermanently. Only export destroyAllDataPermanently from DatabaseAdapter. Update helper

* Expose wrapped TestUtils from index.js. TestUtils exposed select functions from other modules, only in test environment

src/DatabaseAdapter.js

@@ -49,6 +49,18 @@ function clearDatabaseSettings() {
   appDatabaseOptions = {};
 }
 
+//Used by tests
+function destroyAllDataPermanently() {
+  if (process.env.TESTING) {
+    var promises = [];
+    for (var conn in dbConnections) {
+      promises.push(dbConnections[conn].deleteEverything());
+    }
+    return Promise.all(promises);
+  }
+  throw 'Only supported in test environment';
+}
+
 function getDatabaseConnection(appId: string, collectionPrefix: string) {
   if (dbConnections[appId]) {
     return dbConnections[appId];
@@ -71,5 +83,6 @@ module.exports = {
   setAppDatabaseOptions: setAppDatabaseOptions,
   setAppDatabaseURI: setAppDatabaseURI,
   clearDatabaseSettings: clearDatabaseSettings,
+  destroyAllDataPermanently: destroyAllDataPermanently,
   defaultDatabaseURI: databaseURI
 };

src/TestUtils.js

@@ -0,0 +1,15 @@
+import { destroyAllDataPermanently } from './DatabaseAdapter';
+
+let unsupported = function() {
+  throw 'Only supported in test environment';
+};
+
+let _destroyAllDataPermanently;
+if (process.env.TESTING) {
+  _destroyAllDataPermanently = destroyAllDataPermanently;
+} else {
+  _destroyAllDataPermanently = unsupported;
+}
+
+export default {
+    destroyAllDataPermanently: _destroyAllDataPermanently};

src/index.js

@@ -2,6 +2,7 @@ import winston           from 'winston';
 import ParseServer       from './ParseServer';
 import S3Adapter         from 'parse-server-s3-adapter'
 import FileSystemAdapter from 'parse-server-fs-adapter'
+import TestUtils         from './TestUtils';
 import { useExternal }   from './deprecated'
 
 // Factory function
@@ -15,4 +16,4 @@ _ParseServer.createLiveQueryServer = ParseServer.createLiveQueryServer;
 let GCSAdapter = useExternal('GCSAdapter', 'parse-server-gcs-adapter');
 
 export default ParseServer;
-export { S3Adapter, GCSAdapter, FileSystemAdapter, _ParseServer as ParseServer };
+export { S3Adapter, GCSAdapter, FileSystemAdapter, TestUtils, _ParseServer as ParseServer };