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diff --git a/blockly/tests/jsunit/connection_test.js b/blockly/tests/jsunit/connection_test.js
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+/**
+ * @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.
+ */
+
+/**
+ * @fileoverview Tests for connection logic.
+ * @author fenichel@google.com (Rachel Fenichel)
+ */
+'use strict';
+
+var input;
+var output;
+var previous;
+var next;
+
+var dummyWorkspace;
+
+function connectionTest_setUp() {
+  dummyWorkspace = {};
+  function createDummyBlock() {
+    return {
+      workspace: dummyWorkspace,
+      isShadow: function() {return false;}
+    };
+  }
+  input = new Blockly.Connection(createDummyBlock(),
+      Blockly.INPUT_VALUE);
+  output = new Blockly.Connection(createDummyBlock(),
+      Blockly.OUTPUT_VALUE);
+  previous = new Blockly.Connection(createDummyBlock(),
+      Blockly.PREVIOUS_STATEMENT);
+  next = new Blockly.Connection(createDummyBlock(),
+      Blockly.NEXT_STATEMENT);
+}
+
+function connectionTest_tearDown() {
+  input = null;
+  output = null;
+  previous = null;
+  next = null;
+  dummyWorkspace = null;
+}
+
+var isMovableFn = function() { return true; };
+/**
+ * These tests check that the reasons for failures to connect are consistent
+ * (internal view of error states).
+ */
+function testCanConnectWithReason_TargetNull() {
+  connectionTest_setUp();
+
+  assertEquals(Blockly.Connection.REASON_TARGET_NULL,
+      input.canConnectWithReason_(null));
+
+  connectionTest_tearDown();
+}
+
+function testCanConnectWithReason_Disconnect() {
+  connectionTest_setUp();
+
+  var tempConnection = new Blockly.Connection({workspace: dummyWorkspace, isMovable: isMovableFn},
+      Blockly.OUTPUT_VALUE);
+  Blockly.Connection.connectReciprocally_(input, tempConnection);
+  assertEquals(Blockly.Connection.CAN_CONNECT,
+      input.canConnectWithReason_(output));
+
+  connectionTest_tearDown();
+}
+
+function testCanConnectWithReason_DifferentWorkspaces() {
+  connectionTest_setUp();
+
+  input = new Blockly.Connection({workspace: {}}, Blockly.INPUT_VALUE);
+  output = new Blockly.Connection({workspace: dummyWorkspace},
+      Blockly.OUTPUT_VALUE);
+
+  assertEquals(Blockly.Connection.REASON_DIFFERENT_WORKSPACES,
+      input.canConnectWithReason_(output));
+
+  connectionTest_tearDown();
+}
+
+
+function testCanConnectWithReason_Self() {
+  connectionTest_setUp();
+
+  var block = {type_: "test block"};
+  input.sourceBlock_ = block;
+  assertEquals(Blockly.Connection.REASON_SELF_CONNECTION,
+      input.canConnectWithReason_(input));
+
+  connectionTest_tearDown();
+}
+
+function testCanConnectWithReason_Type() {
+  connectionTest_setUp();
+
+  assertEquals(Blockly.Connection.REASON_WRONG_TYPE,
+      input.canConnectWithReason_(previous));
+  assertEquals(Blockly.Connection.REASON_WRONG_TYPE,
+      input.canConnectWithReason_(next));
+
+  assertEquals(Blockly.Connection.REASON_WRONG_TYPE,
+      output.canConnectWithReason_(previous));
+  assertEquals(Blockly.Connection.REASON_WRONG_TYPE,
+      output.canConnectWithReason_(next));
+
+  assertEquals(Blockly.Connection.REASON_WRONG_TYPE,
+      previous.canConnectWithReason_(input));
+  assertEquals(Blockly.Connection.REASON_WRONG_TYPE,
+      previous.canConnectWithReason_(output));
+
+  assertEquals(Blockly.Connection.REASON_WRONG_TYPE,
+      next.canConnectWithReason_(input));
+  assertEquals(Blockly.Connection.REASON_WRONG_TYPE,
+      next.canConnectWithReason_(output));
+
+  connectionTest_tearDown();
+}
+
+function testCanConnectWithReason_CanConnect() {
+  connectionTest_setUp();
+
+  assertEquals(Blockly.Connection.CAN_CONNECT,
+      previous.canConnectWithReason_(next));
+  assertEquals(Blockly.Connection.CAN_CONNECT,
+      next.canConnectWithReason_(previous));
+  assertEquals(Blockly.Connection.CAN_CONNECT,
+      input.canConnectWithReason_(output));
+  assertEquals(Blockly.Connection.CAN_CONNECT,
+      output.canConnectWithReason_(input));
+
+  connectionTest_tearDown();
+}
+
+/**
+ * The next set of tests checks that exceptions are being thrown at the correct
+ * times (external view of errors).
+ */
+function testCheckConnection_Self() {
+  connectionTest_setUp();
+  var block = {type_: "test block"};
+  input.sourceBlock_ = block;
+  try {
+    input.checkConnection_(input);
+    fail();
+  } catch (e) {
+    // expected
+  }
+
+  connectionTest_tearDown();
+}
+
+function testCheckConnection_TypeInputPrev() {
+  connectionTest_setUp();
+  try {
+    input.checkConnection_(previous);
+    fail();
+  } catch (e) {
+    // expected
+  }
+
+  connectionTest_tearDown();
+}
+
+function testCheckConnection_TypeInputNext() {
+  connectionTest_setUp();
+  try {
+    input.checkConnection_(next);
+    fail();
+  } catch (e) {
+    // expected
+  }
+
+  connectionTest_tearDown();
+}
+
+function testCheckConnection_TypeOutputPrev() {
+  connectionTest_setUp();
+  try {
+    output.checkConnection_(previous);
+    fail();
+  } catch (e) {
+    // expected
+  }
+
+  connectionTest_tearDown();
+}
+
+function testCheckConnection_TypePrevInput() {
+  connectionTest_setUp();
+  try {
+    previous.checkConnection_(input);
+    fail();
+  } catch (e) {
+    // expected
+  }
+
+  connectionTest_tearDown();
+}
+
+function testCheckConnection_TypePrevOutput() {
+  connectionTest_setUp();
+  try {
+    previous.checkConnection_(output);
+    fail();
+  } catch (e) {
+    // expected
+  }
+
+  connectionTest_tearDown();
+}
+
+function testCheckConnection_TypeNextInput() {
+  connectionTest_setUp();
+  try {
+    next.checkConnection_(input);
+    fail();
+  } catch (e) {
+    // expected
+  }
+
+  connectionTest_tearDown();
+}
+
+function testCheckConnection_TypeNextOutput() {
+  connectionTest_setUp();
+  try {
+    next.checkConnection_(output);
+    fail();
+  } catch (e) {
+    // expected
+  }
+
+  connectionTest_tearDown();
+}
+
+function test_isConnectionAllowed_Distance() {
+  var sharedWorkspace = {};
+  // Two connections of opposite types near each other.
+  var one = helper_createConnection(5 /* x */, 10 /* y */,
+      Blockly.INPUT_VALUE, null, true);
+  one.sourceBlock_ = helper_makeSourceBlock(sharedWorkspace);
+
+  var two = helper_createConnection(10 /* x */, 15 /* y */,
+      Blockly.OUTPUT_VALUE, null, true);
+  two.sourceBlock_ = helper_makeSourceBlock(sharedWorkspace);
+
+  assertTrue(one.isConnectionAllowed(two, 20.0));
+  // Move connections farther apart.
+  two.x_ = 100;
+  two.y_ = 100;
+  assertFalse(one.isConnectionAllowed(two, 20.0));
+}
+
+function test_isConnectionAllowed_Unrendered() {
+  var sharedWorkspace = {};
+
+  var one = helper_createConnection(5 /* x */, 10 /* y */,
+      Blockly.INPUT_VALUE);
+  one.sourceBlock_ = helper_makeSourceBlock(sharedWorkspace);
+
+  // Don't offer to connect an already connected left (male) value plug to
+  // an available right (female) value plug.
+  var two = helper_createConnection(0, 0, Blockly.OUTPUT_VALUE);
+  two.sourceBlock_ = helper_makeSourceBlock(sharedWorkspace);
+
+  assertTrue(one.isConnectionAllowed(two));
+  var three = helper_createConnection(0, 0, Blockly.INPUT_VALUE);
+  three.sourceBlock_ = helper_makeSourceBlock(sharedWorkspace);
+
+  Blockly.Connection.connectReciprocally_(two, three);
+  assertFalse(one.isConnectionAllowed(two));
+
+  // Don't connect two connections on the same block.
+  two.sourceBlock_ = one.sourceBlock_;
+  assertFalse(one.isConnectionAllowed(two));
+}
+
+function test_isConnectionAllowed_NoNext() {
+  var sharedWorkspace = {};
+  var one = helper_createConnection(0, 0, Blockly.NEXT_STATEMENT);
+  one.sourceBlock_ = helper_makeSourceBlock(sharedWorkspace);
+  one.sourceBlock_.nextConnection = one;
+
+  var two = helper_createConnection(0, 0, Blockly.PREVIOUS_STATEMENT);
+  two.sourceBlock_ = helper_makeSourceBlock(sharedWorkspace);
+
+  assertTrue(two.isConnectionAllowed(one));
+
+  var three = helper_createConnection(0, 0, Blockly.PREVIOUS_STATEMENT);
+  three.sourceBlock_ = helper_makeSourceBlock(sharedWorkspace);
+  three.sourceBlock_.previousConnection = three;
+  Blockly.Connection.connectReciprocally_(one, three);
+
+  // A terminal block is allowed to replace another terminal block.
+  assertTrue(two.isConnectionAllowed(one));
+}
+
+function testCheckConnection_Okay() {
+  connectionTest_setUp();
+  previous.checkConnection_(next);
+  next.checkConnection_(previous);
+  input.checkConnection_(output);
+  output.checkConnection_(input);
+
+  connectionTest_tearDown();
+}