text: /**
   * @license
   * Blockly Tests
   *
   * Copyright 2015 Google Inc.
   * https://developers.google.com/blockly/
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  'use strict';
  
  function verify_DB_(msg, expected, db) {
     var equal = (expected.length == db.length);
     if (equal) {
       for (var x = 0; x < expected.length; x++) {
         if (expected[x] != db[x]) {
           equal = false;
           break;
         }
       }
     }
     if (equal) {
       assertTrue(msg, true);
     } else {
       assertEquals(msg, expected, db);
     }
  }
  
  function test_DB_addConnection() {
    var db = new Blockly.ConnectionDB();
    var o2 = {y_: 2, sourceBlock_: {}};
    db.addConnection_(o2);
    verify_DB_('Adding connection #2', [o2], db);
  
    var o4 = {y_: 4, sourceBlock_: {}};
    db.addConnection_(o4);
    verify_DB_('Adding connection #4', [o2, o4], db);
  
    var o1 = {y_: 1, sourceBlock_: {}};
    db.addConnection_(o1);
    verify_DB_('Adding connection #1', [o1, o2, o4], db);
  
    var o3a = {y_: 3, sourceBlock_: {}};
    db.addConnection_(o3a);
    verify_DB_('Adding connection #3a', [o1, o2, o3a, o4], db);
  
    var o3b = {y_: 3, sourceBlock_: {}};
    db.addConnection_(o3b);
    verify_DB_('Adding connection #3b', [o1, o2, o3b, o3a, o4], db);
  }
  
  function test_DB_removeConnection() {
    var db = new Blockly.ConnectionDB();
    var o1 = {y_: 1, sourceBlock_: {}};
    var o2 = {y_: 2, sourceBlock_: {}};
    var o3a = {y_: 3, sourceBlock_: {}};
    var o3b = {y_: 3, sourceBlock_: {}};
    var o3c = {y_: 3, sourceBlock_: {}};
    var o4 = {y_: 4, sourceBlock_: {}};
    db.addConnection_(o1);
    db.addConnection_(o2);
    db.addConnection_(o3c);
    db.addConnection_(o3b);
    db.addConnection_(o3a);
    db.addConnection_(o4);
    verify_DB_('Adding connections 1-4', [o1, o2, o3a, o3b, o3c, o4], db);
  
    db.removeConnection_(o2);
    verify_DB_('Removing connection #2', [o1, o3a, o3b, o3c, o4], db);
  
    db.removeConnection_(o4);
    verify_DB_('Removing connection #4', [o1, o3a, o3b, o3c], db);
  
    db.removeConnection_(o1);
    verify_DB_('Removing connection #1', [o3a, o3b, o3c], db);
  
    db.removeConnection_(o3a);
    verify_DB_('Removing connection #3a', [o3b, o3c], db);
  
    db.removeConnection_(o3c);
    verify_DB_('Removing connection #3c', [o3b], db);
  
    db.removeConnection_(o3b);
    verify_DB_('Removing connection #3b', [], db);
  }
  