refactor: use async/await, const and arrow function

Author: mariangz

tests/integration/test.constructor.js

@@ -1,50 +1,58 @@
 'use strict';
 
-describe('constructor errors', function () {
+describe('constructor errors', () => {
 
-  it('should error on an undefined name', function (done) {
+  it('should error on an undefined name', () => {
     try {
       new PouchDB();
-      done('Should have thrown');
+      throw new Error('Should have thrown');
     } catch (err) {
+      if (err.message === 'Should have thrown') {
+        throw err;
+      }
       should.equal(err instanceof Error, true, 'should be an error');
-      done();
     }
   });
 
-  it('should error on an undefined adapter', function (done) {
+  it('should error on an undefined adapter', () => {
     try {
       new PouchDB('foo', {adapter : 'myFakeAdapter'});
-      done('Should have thrown');
+      throw new Error('Should have thrown');
     } catch (err) {
+      if (err.message === 'Should have thrown') {
+        throw err;
+      }
       should.equal(err instanceof Error, true, 'should be an error');
       err.message.should
         .equal('Invalid Adapter: myFakeAdapter',
                'should give the correct error message');
-      done();
     }
   });
 
-  it('should error on an undefined view adapter', function (done) {
+  it('should error on an undefined view adapter', () => {
     try {
       new PouchDB('foo', {view_adapter : 'myFakeViewAdapter'});
-      done('Should have thrown');
+      throw new Error('Should have thrown');
     } catch (err) {
+      if (err.message === 'Should have thrown') {
+        throw err;
+      }
       should.equal(err instanceof Error, true, 'should be an error');
       err.message.should
         .equal('Invalid View Adapter: myFakeViewAdapter',
                'should give the correct error message');
-      done();
     }
   });
 
-  it('should error on a null name', function (done) {
+  it('should error on a null name', () => {
     try {
       new PouchDB(null);
-      done('Should have thrown');
+      throw new Error('Should have thrown');
     } catch (err) {
+      if (err.message === 'Should have thrown') {
+        throw err;
+      }
       should.equal(err instanceof Error, true, 'should be an error');
-      done();
     }
   });