Add unit tests for ol.View.createCenterConstraint

test/spec/ol/view.test.js

@@ -21,6 +21,32 @@ describe('ol.View', function() {
 
   describe('create constraints', function() {
 
+    describe('create center constraint', function() {
+
+      describe('with no options', function() {
+        it('gives a correct center constraint function', function() {
+          var options = {};
+          var fn = ol.View.createCenterConstraint_(options);
+          expect(fn([0, 0])).to.eql([0, 0]);
+          expect(fn(undefined)).to.eql(undefined);
+          expect(fn([42, -100])).to.eql([42, -100]);
+        });
+      });
+
+      describe('with extent option', function() {
+        it('gives a correct center constraint function', function() {
+          var options = {
+            extent: [0, 0, 1, 1]
+          };
+          var fn = ol.View.createCenterConstraint_(options);
+          expect(fn([0, 0])).to.eql([0, 0]);
+          expect(fn([-10, 0])).to.eql([0, 0]);
+          expect(fn([100, 100])).to.eql([1, 1]);
+        });
+      });
+
+    });
+
     describe('create resolution constraint', function() {
 
       describe('with no options', function() {