add a test for #569

Author: sidorares

test/integration/test-pool-release.js

@@ -0,0 +1,35 @@
+var createPool = require('../common.js').createPool;
+var assert = require('assert');
+
+var pool = createPool();
+
+pool.query('test sql', function(err, res, rows) {
+  pool.query('test sql', [], function(err, res, rows) {
+    pool.query('test sql', [], function(err, res, rows) {
+      pool.query('test sql', [], function(err, res, rows) {
+        pool.query('test sql', function(err, res, rows) {
+          pool.query('test sql').on('error', function(err) {
+            pool.query('test sql', function(err, res, rows) {
+              pool.execute('test sql', function(err, res, rows) {
+                pool.execute('test sql', function(err, res, rows) {
+                  pool.execute('test sql', [], function(err, res, rows) {
+                    pool.execute('test sql', function(err) {
+                      pool.execute('test sql', function(err, res, rows) {
+                        // TODO change order events are fires so that connection is released before callback
+                        // that way this number will be more deterministic
+                        assert(pool._allConnections.length < 3);
+                        assert(pool._freeConnections.length === 1);
+                        assert(pool._connectionQueue.length === 0);
+                        pool.end();
+                      });
+                    });
+                  });
+                });
+              });
+            });
+          });
+        });
+      });
+    });
+  });
+});