tests for min/maxIndex datasource preset

Author: dhilt

test/UserIndiciesSpec.js

@@ -9,7 +9,7 @@ describe('uiScroll main/max indicies', function() {
     var viewportHeight = 120;
     var itemHeight = 20;
     var bufferSize = 3;
-    var userMinIndex = -100;
+    var userMinIndex = -99; // for 100 items
     var userMaxIndex = 100;
 
     var scrollSettings = {
@@ -18,44 +18,75 @@ describe('uiScroll main/max indicies', function() {
       itemHeight: itemHeight,
       bufferSize: bufferSize
     };
-    it('should calculate bottom padding element\'s height after user max index is set', function() {
 
+    it('should calculate bottom padding element\'s height after user max index is set', function() {
       var setMaxIndex;
       inject(function(myInfiniteDatasource) {
         setMaxIndex = function() {
           myInfiniteDatasource.maxIndex = userMaxIndex;
         };
       });
-
       runTest(scrollSettings,
         function(viewport) {
           var bottomPaddingElement = angular.element(viewport.children()[viewport.children().length - 1]);
+          expect(viewport.scrollTop()).toBe(itemHeight * bufferSize);
 
           setMaxIndex();
 
           var virtualItemsAmount = userMaxIndex - (viewportHeight / itemHeight) - bufferSize;
           expect(bottomPaddingElement.height()).toBe(itemHeight * virtualItemsAmount);
+          expect(viewport.scrollTop()).toBe(itemHeight * bufferSize);
         }
       );
     });
 
     it('should calculate top padding element\'s height after user min index is set', function() {
-
       var setMinIndex;
       inject(function(myInfiniteDatasource) {
         setMinIndex = function() {
           myInfiniteDatasource.minIndex = userMinIndex;
         };
       });
-
       runTest(scrollSettings,
         function(viewport) {
           var topPaddingElement = angular.element(viewport.children()[0]);
+          expect(viewport.scrollTop()).toBe(itemHeight * bufferSize);
 
           setMinIndex();
 
           var virtualItemsAmount = (-1) * userMinIndex - bufferSize + 1;
           expect(topPaddingElement.height()).toBe(itemHeight * virtualItemsAmount);
+          expect(viewport.scrollTop()).toBe(itemHeight * ((-1) * userMinIndex + 1));
+        }
+      );
+    });
+
+    it('should work with maxIndex pre-set on datasource', function() {
+      var setMinIndex;
+      inject(function(myInfiniteDatasource) {
+        myInfiniteDatasource.maxIndex = userMaxIndex;
+      });
+      runTest(scrollSettings,
+        function(viewport) {
+          var bottomPaddingElement = angular.element(viewport.children()[viewport.children().length - 1]);
+          var virtualItemsAmount = userMaxIndex - (viewportHeight / itemHeight) - bufferSize;
+          expect(bottomPaddingElement.height()).toBe(itemHeight * virtualItemsAmount);
+          expect(viewport.scrollTop()).toBe(itemHeight * bufferSize);
+        }
+      );
+    });
+
+    it('should work with minIndex pre-set on datasource', function() {
+      var setMinIndex;
+      inject(function(myInfiniteDatasource) {
+        myInfiniteDatasource.minIndex = userMinIndex;
+      });
+      runTest(scrollSettings,
+        function(viewport) {
+          var topPaddingElement = angular.element(viewport.children()[0]);
+          var virtualItemsAmount = (-1) * userMinIndex - bufferSize + 1;
+          expect(topPaddingElement.height()).toBe(itemHeight * virtualItemsAmount);
+          expect(viewport.scrollTop()).toBe(itemHeight * ((-1) * userMinIndex + 1));
         }
       );
     });