tests: add pool cluster random test

Author: dougwilson

package.json

@@ -22,6 +22,7 @@
     "istanbul": "0.4.5",
     "require-all": "2.1.0",
     "rimraf": "2.2.8",
+    "seedrandom": "2.4.2",
     "timezone-mock": "0.0.0",
     "mkdirp": "0.5.1",
     "urun": "0.0.8",

test/unit/pool-cluster/test-connection-random.js

@@ -0,0 +1,54 @@
+var assert     = require('assert');
+var common     = require('../../common');
+var seedrandom = require('seedrandom');
+var cluster    = common.createPoolCluster();
+var server     = common.createFakeServer();
+
+var poolConfig = common.getTestConfig({port: common.fakeServerPort});
+cluster.add('SLAVE1', poolConfig);
+cluster.add('SLAVE2', poolConfig);
+cluster.add('SLAVE3', poolConfig);
+
+server.listen(common.fakeServerPort, function(err) {
+  assert.ifError(err);
+
+  var count = 7;
+  var order = [];
+  var pool  = cluster.of('SLAVE*', 'RANDOM');
+
+  seedrandom('cluster random rest', {
+    global: true
+  });
+
+  next();
+
+  function done() {
+    assert.deepEqual(order, [
+      'SLAVE2',
+      'SLAVE3',
+      'SLAVE2',
+      'SLAVE2',
+      'SLAVE1',
+      'SLAVE2',
+      'SLAVE1'
+    ]);
+    cluster.end(function (err) {
+      assert.ifError(err);
+      server.destroy();
+    });
+  }
+
+  function next() {
+    pool.getConnection(function (err, conn) {
+      assert.ifError(err);
+      order.push(conn._clusterId);
+      conn.release();
+
+      if (--count > 0) {
+        next();
+      } else {
+        done();
+      }
+    });
+  }
+});