Jasmine tests for ol.Projection

test/jasmine-extensions.js

@@ -3,6 +3,9 @@ beforeEach(function() {
     this.addMatchers({
         toBeA: function(type) {
             return this.actual instanceof type;
+        },
+        toRoughlyEqual: function(other, tol) {
+            return Math.abs(this.actual - other) <= tol;
         }
     });
 });

test/ol.html

@@ -77,6 +77,7 @@
   <!-- include spec files here... -->
   <script type="text/javascript" src="spec/ol/object.test.js"></script>
   <script type="text/javascript" src="spec/ol/tilecoord.test.js"></script>
+  <script type="text/javascript" src="spec/ol/projection.test.js"></script>
 
   <script type="text/javascript">
     (function() {

test/spec/ol/projection.test.js

@@ -0,0 +1,103 @@
+goog.require('goog.array');
+goog.require('ol.Coordinate');
+goog.require('ol.Projection');
+
+describe('ol.Projection', function() {
+
+  describe('projection equivalence', function() {
+
+    function _testAllEquivalent(codes) {
+      var projections = goog.array.map(codes, ol.Projection.getFromCode);
+      goog.array.forEach(projections, function(source) {
+        goog.array.forEach(projections, function(destination) {
+          expect(ol.Projection.equivalent(source, destination)).toBeTruthy();
+        });
+      });
+    }
+
+    it('gives that 3857, 102100, 102113, 900913 are equivalent ', function() {
+      _testAllEquivalent([
+        'EPSG:3857',
+        'EPSG:102100',
+        'EPSG:102113',
+        'EPSG:900913'
+      ]);
+    });
+
+    it('gives that CRS:84, urn:ogc:def:crs:EPSG:6.6:4326, EPSG:4326 are equivalent', function() {
+      _testAllEquivalent([
+        'CRS:84',
+        'urn:ogc:def:crs:EPSG:6.6:4326',
+        'EPSG:4326'
+      ]);
+    });
+
+  });
+
+  describe('identify transform', function() {
+
+    it('returns a new object, with same coord values', function() {
+      var epsg4326 = ol.Projection.getFromCode('EPSG:4326');
+      var uniqueObject = {};
+      var sourcePoint = new ol.Coordinate(uniqueObject, uniqueObject);
+      var destinationPoint = ol.Projection.transform(
+          sourcePoint, epsg4326, epsg4326);
+      expect(sourcePoint === destinationPoint).toBeFalsy();
+      expect(destinationPoint.x === sourcePoint.x).toBeTruthy();
+      expect(destinationPoint.y === sourcePoint.y).toBeTruthy();
+    });
+  });
+
+  describe('transform 0,0 from 4326 to 3857', function() {
+
+    it('returns expected value', function() {
+      var point = ol.Projection.transformWithCodes(
+          new ol.Coordinate(0, 0), 'EPSG:4326', 'EPSG:3857');
+      expect(point).not.toBeUndefined();
+      expect(point).not.toBeNull();
+      expect(point.y).toRoughlyEqual(0, 1e-9);
+    });
+  });
+
+  describe('transform 0,0 from 3857 to 4326', function() {
+
+    it('returns expected value', function() {
+      var point = ol.Projection.transformWithCodes(
+          new ol.Coordinate(0, 0), 'EPSG:3857', 'EPSG:4326');
+      expect(point).not.toBeUndefined();
+      expect(point).not.toBeNull();
+      expect(point.x).toEqual(0);
+      expect(point.y).toEqual(0);
+    });
+  });
+
+  describe('transform from 4326 to 3857 (Alastaira)', function() {
+    // http://alastaira.wordpress.com/2011/01/23/the-google-maps-bing-maps-spherical-mercator-projection/
+
+    it('returns expected value', function() {
+      var point = ol.Projection.transformWithCodes(
+          new ol.Coordinate(-5.625, 52.4827802220782),
+          'EPSG:4326',
+          'EPSG:900913');
+      expect(point).not.toBeUndefined();
+      expect(point).not.toBeNull();
+      expect(point.x).toRoughlyEqual(-626172.13571216376, 1e-9);
+      expect(point.y).toRoughlyEqual(6887893.4928337997, 1e-9);
+    });
+  });
+
+  describe('transform from 3857 to 4326 (Alastaira)', function() {
+    // http://alastaira.wordpress.com/2011/01/23/the-google-maps-bing-maps-spherical-mercator-projection/
+
+    it('returns expected value', function() {
+      var point = ol.Projection.transformWithCodes(
+          new ol.Coordinate(-626172.13571216376, 6887893.4928337997),
+          'EPSG:900913',
+          'EPSG:4326');
+      expect(point).not.toBeUndefined();
+      expect(point).not.toBeNull();
+      expect(point.x).toRoughlyEqual(-5.625, 1e-9);
+      expect(point.y).toRoughlyEqual(52.4827802220782, 1e-9);
+    });
+  });
+});