Change tests to be able to be runned on mysql instances with --skip-grant-tables

Some auth tests won't have the expected 'access denied' because mysql
instance will accept any user/password combination (fixes #312)

Author: dresende

test/integration/connection/test-bad-credentials.js

@@ -12,9 +12,13 @@ var connectErr;
 connection.connect(function(err) {
   assert.equal(connectErr, undefined);
   connectErr = err;
+
+  connection.end();
 });
 
 process.on('exit', function() {
+  if (process.env.NO_GRANT == '1' && typeof endErr == 'undefined') return;
+
   assert.equal(endErr.code, 'ER_ACCESS_DENIED_ERROR');
   assert.ok(/access denied/i.test(endErr.message));
 

test/integration/connection/test-change-user-fatal-error.js

@@ -14,11 +14,11 @@ if (common.isTravis()) {
 var err;
 connection.changeUser({user: 'does-not-exist'}, function(_err) {
   err = _err;
+  connection.end();
 });
-connection.end();
 
 process.on('exit', function() {
-  if (err === null) return;
+  if (process.env.NO_GRANT == '1' && err === null) return;
   assert.equal(err.code, 'ER_ACCESS_DENIED_ERROR');
   assert.equal(err.fatal, true);
 });

test/integration/connection/test-fatal-auth-error-going-to-all-callbacks.js

@@ -12,9 +12,13 @@ connection.connect(function(err) {
 connection.query('SELECT 1', function(err) {
   assert.equal(errors.b, undefined);
   errors.b = err;
+
+  connection.end();
 });
 
 process.on('exit', function() {
+  if (process.env.NO_GRANT == '1' && errors.a === null) return;
+
   assert.equal(errors.a.code, 'ER_ACCESS_DENIED_ERROR');
   assert.equal(errors.a.fatal, true);
   assert.strictEqual(errors.a, errors.b);

test/integration/connection/test-fatal-auth-error-without-handlers.js

@@ -10,8 +10,11 @@ connection.on('error', function(_err) {
   assert.equal(err, undefined);
   err = _err;
 });
+connection.end();
 
 process.on('exit', function() {
+  if (process.env.NO_GRANT == '1' && typeof err == 'undefined') return;
+
   assert.equal(err.code, 'ER_ACCESS_DENIED_ERROR');
   assert.equal(err.fatal, true);
 });