Allow single server instance in test suite (#7262)

* initial pass

* reconfigureServer when needed

* finish postgres tests

* mongo tests

* more tests

* clean up

* re-add skipped test

* Fix transaction tests

* handle batch

* AuthenticationAdapter fix

* More reconfiguration

* clean up

* properly terminate cli servers

* handle Parse.Push

* Flaky PushController

* ensure reconfigureServer when changed

* fix postgres tests

* remove console.log

* LiveQuery spec remove duplicates and listeners

spec/Schema.spec.js

@@ -3,7 +3,6 @@
 const Config = require('../lib/Config');
 const SchemaController = require('../lib/Controllers/SchemaController');
 const dd = require('deep-diff');
-const TestUtils = require('../lib/TestUtils');
 
 let config;
 
@@ -27,8 +26,6 @@ describe('SchemaController', () => {
 
   afterEach(async () => {
     await config.database.schemaCache.clear();
-    await TestUtils.destroyAllDataPermanently(false);
-    await config.database.adapter.performInitialization({ VolatileClassesSchemas: [] });
   });
 
   it('can validate one object', done => {
@@ -854,7 +851,8 @@ describe('SchemaController', () => {
       });
   });
 
-  it('creates non-custom classes which include relation field', done => {
+  it('creates non-custom classes which include relation field', async done => {
+    await reconfigureServer();
     config.database
       .loadSchema()
       //as `_Role` is always created by default, we only get it here
@@ -1313,7 +1311,8 @@ describe('SchemaController', () => {
       );
   });
 
-  it('properly handles volatile _Schemas', done => {
+  it('properly handles volatile _Schemas', async done => {
+    await reconfigureServer();
     function validateSchemaStructure(schema) {
       expect(Object.prototype.hasOwnProperty.call(schema, 'className')).toBe(true);
       expect(Object.prototype.hasOwnProperty.call(schema, 'fields')).toBe(true);