Convert metrics jsunit test to mocha (#2871)

* Convert metrics jsunit test to mocha

tests/mocha/index.html

@@ -45,6 +45,7 @@
     <script src="field_variable_test.js"></script>
     <script src="gesture_test.js"></script>
     <script src="key_map_test.js"></script>
+    <script src="metrics_test.js"></script>
     <script src="names_test.js"></script>
     <script src="navigation_modify_test.js"></script>
     <script src="navigation_test.js"></script>

tests/mocha/metrics_test.js

@@ -0,0 +1,120 @@
+/**
+ * @license
+ * Visual Blocks Editor
+ *
+ * Copyright 2019 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 Metrics tests.
+ * @author samelh@google.com (Sam El-Husseini)
+ */
+'use strict';
+
+suite('Metrics', function() {
+  function assertDimensionsMatch(toCheck, left, top, width, height) {
+    assertEquals('Top did not match.', top, toCheck.top);
+    assertEquals('Left did not match.', left, toCheck.left);
+    assertEquals('Width did not match.', width, toCheck.width);
+    assertEquals('Height did not match.', height, toCheck.height);
+  }
+
+  // Make a mock workspace object with two properties:
+  // getBlocksBoundingBox and scale.
+  function makeMockWs(scale, x, y, width, height) {
+    return {
+      getBlocksBoundingBox: function() {
+        return {
+          top: y,
+          bottom: y + height,
+          left: x,
+          right: x + width
+        };
+      },
+      scale: scale
+    };
+  }
+
+  test('GetContentDimensionsExact - empty', function() {
+    var ws = makeMockWs(1, 0, 0, 0, 0);
+    var defaultZoom = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    assertDimensionsMatch(defaultZoom, 0, 0, 0, 0);
+  });
+  test('GetContentDimensionsExact - empty zoom in', function() {
+    var ws = makeMockWs(2, 0, 0, 0, 0);
+    var zoomIn = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    assertDimensionsMatch(zoomIn, 0, 0, 0, 0);
+  });
+  test('GetContentDimensionsExact - empty zoom out', function() {
+    var ws = makeMockWs(.5, 0, 0, 0, 0);
+    var zoomOut = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    assertDimensionsMatch(zoomOut, 0, 0, 0, 0);
+  });
+  test('GetContentDimensionsExact - non empty at origin', function() {
+    var ws = makeMockWs(1, 0, 0, 100, 100);
+    var defaultZoom = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    // Pixel and ws units are the same at default zoom.
+    assertDimensionsMatch(defaultZoom, 0, 0, 100, 100);
+  });
+  test('GetContentDimensionsExact - non empty at origin zoom in', function() {
+    var ws = makeMockWs(2, 0, 0, 100, 100);
+    var zoomIn = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    // 1 ws unit = 2 pixels at this zoom level.
+    assertDimensionsMatch(zoomIn, 0, 0, 200, 200);
+  });
+  test('GetContentDimensionsExact - non empty at origin zoom out', function() {
+    var ws = makeMockWs(.5, 0, 0, 100, 100);
+    var zoomOut = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    // 1 ws unit = 0.5 pixels at this zoom level.
+    assertDimensionsMatch(zoomOut, 0, 0, 50, 50);
+  });
+  test('GetContentDimensionsExact - non empty positive origin', function() {
+    var ws = makeMockWs(1, 10, 10, 100, 100);
+    var defaultZoom = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    // Pixel and ws units are the same at default zoom.
+    assertDimensionsMatch(defaultZoom, 10, 10, 100, 100);
+  });
+  test('GetContentDimensionsExact - non empty positive origin zoom in', function() {
+    var ws = makeMockWs(2, 10, 10, 100, 100);
+    var zoomIn = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    // 1 ws unit = 2 pixels at this zoom level.
+    assertDimensionsMatch(zoomIn, 20, 20, 200, 200);
+  });
+  test('GetContentDimensionsExact - non empty positive origin zoom out', function() {
+    var ws = makeMockWs(.5, 10, 10, 100, 100);
+    var zoomOut = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    // 1 ws unit = 0.5 pixels at this zoom level.
+    assertDimensionsMatch(zoomOut, 5, 5, 50, 50);
+  });
+  test('GetContentDimensionsExact - non empty negative origin', function() {
+    var ws = makeMockWs(1, -10, -10, 100, 100);
+    var defaultZoom = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    // Pixel and ws units are the same at default zoom.
+    assertDimensionsMatch(defaultZoom, -10, -10, 100, 100);
+  });
+  test('GetContentDimensionsExact - non empty negative origin zoom in', function() {
+    var ws = makeMockWs(2, -10, -10, 100, 100);
+    var zoomIn = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    // 1 ws unit = 2 pixels at this zoom level.
+    assertDimensionsMatch(zoomIn, -20, -20, 200, 200);
+  });
+  test('GetContentDimensionsExact - non empty negative origin zoom out', function() {
+    var ws = makeMockWs(.5, -10, -10, 100, 100);
+    var zoomOut = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+    // 1 ws unit = 0.5 pixels at this zoom level.
+    assertDimensionsMatch(zoomOut, -5, -5, 50, 50);
+  });
+});