fix(amplify-dynamodb-simulator):callback revoked within time-limit (#…

…7843)

* fix(amplify-dynamodb-simulator):callback revoked within time-limit

* fix(amplify-dynamodb-simulator):merged all beforeEach()/afterEach() into one

* try...catch added to clean up

packages/amplify-dynamodb-simulator/__test__/index.test.js

@@ -39,19 +39,26 @@ describe('emulator operations', () => {
 
   const ensureNoDbPath = () => {
     if (fs.existsSync(dbPath)) {
-      fs.removeSync(dbPath);
+      try {
+        fs.removeSync(dbPath);
+      }
+      catch(err) {
+        console.log(err);
+      }
     }
   };
 
-  beforeEach(ensureNoDbPath);
-  afterEach(ensureNoDbPath);
-
   let emulators;
-  beforeEach(() => {
+  beforeEach(async () => {
+    ensureNoDbPath();
     emulators = [];
     jest.setTimeout(40 * 1000);
   });
-  afterEach(async () => await Promise.all(emulators.map(emu => emu.terminate())));
+
+  afterEach(async () => {
+    await Promise.all(emulators.map(emu => emu.terminate()));
+    ensureNoDbPath();
+  });
 
   it('should support in memory operations', async () => {
     const emu = await ddbSimulator.launch();
@@ -73,15 +80,14 @@ describe('emulator operations', () => {
       })
       .promise();
     await emuOne.terminate();
-
+    emulators = [];
     const emuTwo = await ddbSimulator.launch({ dbPath });
     emulators.push(emuTwo);
     const dynamoTwo = await ddbSimulator.getClient(emuTwo);
     const t = await dynamoTwo.listTables().promise();
     expect(t).toEqual({
       TableNames: ['foo'],
     });
-    emuTwo.terminate();
   });
 
   it('should start on specific port', async () => {