Move connection_db to a new file and start adding tests

tests/jsunit/connection_db_test.js

@@ -93,3 +93,59 @@ function test_DB_removeConnection() {
   db.removeConnection_(o3b);
   verify_DB_('Removing connection #3b', [], db);
 }
+
+function test_DB_getNeighbours() {
+  var db = new Blockly.ConnectionDB();
+
+  // Search an empty list.
+  assertEquals(helper_getNeighbours(db, 10 /* x */, 10 /* y */, 100 /* radius */).length, 0);
+
+  // Set up some connections.
+  for (var i = 0; i < 10; i++) {
+      db.addConnection_(helper_createConnection(0, i, Blockly.PREVIOUS_STATEMENT));
+  }
+
+  // Test block belongs at beginning
+  var result = helper_getNeighbours(db, 0, 0, 4);
+  assertEquals(5, result.length);
+  for (i = 0; i < result.length; i++) {
+      assertNotEquals(result.indexOf(db[i]), -1); // contains
+  }
+
+  // Test block belongs at middle
+  result = helper_getNeighbours(db, 0, 4, 2);
+  assertEquals(5, result.length);
+  for (i = 0; i < result.length; i++) {
+      assertNotEquals(result.indexOf(db[i + 2]), -1); // contains
+  }
+
+  // Test block belongs at end
+  result = helper_getNeighbours(db, 0, 9, 4);
+  assertEquals(5, result.length);
+  for (i = 0; i < result.length; i++) {
+      assertNotEquals(result.indexOf(db[i + 5]), -1); // contains
+  }
+
+  // Test block has no neighbours due to being out of range in the x direction
+  result = helper_getNeighbours(db, 10, 9, 4);
+  assertEquals(result.length, 0);
+
+  // Test block has no neighbours due to being out of range in the y direction
+  result = helper_getNeighbours(db, 0, 19, 4);
+  assertEquals(result.length, 0);
+
+  // Test block has no neighbours due to being out of range diagonally
+  result = helper_getNeighbours(db, -2, -2, 2);
+  assertEquals(result.length, 0);
+}
+
+function helper_getNeighbours(db, x, y, radius) {
+  return db.getNeighbours(helper_createConnection(x, y, Blockly.NEXT_STATEMENT), radius);
+}
+
+function helper_createConnection(x, y, type) {
+  var conn = new Blockly.Connection({workspace: {}}, type);
+  conn.x_ = x;
+  conn.y_ = y;
+  return conn;
+}

tests/jsunit/db_test.js

@@ -0,0 +1,76 @@
+/**
+ * @license
+ * Blockly Tests
+ *
+ * Copyright 2016 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 test_DB_getNeighbours() {
+  var db = new Blockly.ConnectionDB();
+
+  // Search an empty list.
+  assertEquals(helper_getNeighbours(db, 10 /* x */, 10 /* y */, 100 /* radius */).length, 0);
+
+  // Set up some connections.
+  for (var i = 0; i < 10; i++) {
+      db.addConnection_(helper_createConnection(0, i, Blockly.PREVIOUS_STATEMENT));
+  }
+
+  // Test block belongs at beginning
+  var result = helper_getNeighbours(db, 0, 0, 4);
+  assertEquals(5, result.length);
+  for (i = 0; i < result.length; i++) {
+      assertNotEquals(result.indexOf(db[i]), -1); // contains
+  }
+
+  // Test block belongs at middle
+  result = helper_getNeighbours(db, 0, 4, 2);
+  assertEquals(5, result.length);
+  for (i = 0; i < result.length; i++) {
+      assertNotEquals(result.indexOf(db[i + 2]), -1); // contains
+  }
+
+  // Test block belongs at end
+  result = helper_getNeighbours(db, 0, 9, 4);
+  assertEquals(5, result.length);
+  for (i = 0; i < result.length; i++) {
+      assertNotEquals(result.indexOf(db[i + 5]), -1); // contains
+  }
+
+  // Test block has no neighbours due to being out of range in the x direction
+  result = helper_getNeighbours(db, 10, 9, 4);
+  assertEquals(result.length, 0);
+
+  // Test block has no neighbours due to being out of range in the y direction
+  result = helper_getNeighbours(db, 0, 19, 4);
+  assertEquals(result.length, 0);
+
+  // Test block has no neighbours due to being out of range diagonally
+  result = helper_getNeighbours(db, -2, -2, 2);
+  assertEquals(result.length, 0);
+}
+
+function helper_getNeighbours(db, x, y, radius) {
+  return db.getNeighbours(helper_createConnection(x, y, Blockly.NEXT_STATEMENT), radius);
+}
+
+function helper_createConnection(x, y, type) {
+  var conn = new Blockly.Connection({workspace: {}}, type);
+  conn.x_ = x;
+  conn.y_ = y;
+  return conn;
+}