diff --git a/html/admin/js/graphViewer/jasmine_test/jasmineTestLinks.html b/html/admin/js/graphViewer/jasmine_test/jasmineTestLinks.html
index 81ffeb8e7e..28b6eb13da 100644
--- a/html/admin/js/graphViewer/jasmine_test/jasmineTestLinks.html
+++ b/html/admin/js/graphViewer/jasmine_test/jasmineTestLinks.html
@@ -12,6 +12,7 @@
     <li><a href="runnerEventDispatcher.html">Event Dispatcher</a></li>
     <li><a href="runnerEventLibrary.html">Event Library</a></li>
     <li><a href="runnerColourMapper.html">Colour Mapper</a></li>
+    <li><a href="runnerZoomManager.html">Zoom Manager</a></li>
   </ul>
 </body>
 
diff --git a/html/admin/js/graphViewer/jasmine_test/specZoomManager/zoomManagerSpec.js b/html/admin/js/graphViewer/jasmine_test/specZoomManager/zoomManagerSpec.js
index 7daf0bd1a0..7d622b9e19 100644
--- a/html/admin/js/graphViewer/jasmine_test/specZoomManager/zoomManagerSpec.js
+++ b/html/admin/js/graphViewer/jasmine_test/specZoomManager/zoomManagerSpec.js
@@ -1,5 +1,5 @@
 /*jslint indent: 2, nomen: true, maxlen: 100, white: true  plusplus: true */
-/*global beforeEach, afterEach */
+/*global beforeEach, afterEach, Jasmine */
 /*global describe, it, expect */
 /*global window, eb, loadFixtures, document */
 /*global $, _, d3*/
@@ -72,36 +72,231 @@
 
   });
 
-  describe('setup correctly', function() {
+  describe('setup with default values', function() {
     
-    var manager;
+    var w,
+      h,
+      manager;
     
     beforeEach(function() {
-      manager = new ZoomManager(10, 10);
+      w = 200;
+      h = 200;
+      manager = new ZoomManager(w, h);
     });
     
-    it('should offer a function to get the current font-size', function() {
-      expect(manager.getFontSize).toBeDefined();
-      expect(manager.getFontSize).toEqual(Jasmine.any(Function));
+    describe('the interface', function() {
+      it('should offer a function to get the current font-size', function() {
+        expect(manager.getFontSize).toBeDefined();
+        expect(manager.getFontSize).toEqual(Jasmine.any(Function));
+      });
+    
+      it('should offer a function to get the current node-radius', function() {
+        expect(manager.getRadius).toBeDefined();
+        expect(manager.getRadius).toEqual(Jasmine.any(Function));
+      });
+    
+      it('should offer a function to get the node limit', function() {
+        expect(manager.getNodeLimit).toBeDefined();
+        expect(manager.getNodeLimit).toEqual(Jasmine.any(Function));
+      });
+    
+      it('should offer a function to get the distortion', function() {
+        expect(manager.getDistortion).toBeDefined();
+        expect(manager.getDistortion).toEqual(Jasmine.any(Function));
+      });
+    
+      it('should offer a function for zoom-in', function() {
+        expect(manager.zoomIn).toBeDefined();
+        expect(manager.zoomIn).toEqual(Jasmine.any(Function));
+      });
+    
+      it('should offer a function for zoom-out', function() {
+        expect(manager.zoomOut).toBeDefined();
+        expect(manager.zoomOut).toEqual(Jasmine.any(Function));
+      });
     });
     
-    it('should offer a function to get the current node-radius', function() {
-      expect(manager.getRadius).toBeDefined();
-      expect(manager.getRadius).toEqual(Jasmine.any(Function));
+    describe('default values', function() {
+     
+      var fontMax,
+        fontMin,
+        radMax,
+        radMin,
+        nodeMax,
+        nodeMaxNoLabel,
+        nodeMinLabel,
+        nodeMin;
+      
+      
+      beforeEach(function() {
+        var labelSize = function (font) {
+          return 60 * font * font;
+        },
+          circleSize = function (radius) {
+            return 4 * radius * radius * Math.PI;
+          };
+        fontMax = 16;
+        fontMin = 6;
+        radMax = 25;
+        radMin = 1;
+        nodeMax = Math.floor(w * h / labelSize(fontMax));
+        nodeMinLabel = Math.floor(w * h / labelSize(fontMin));
+        nodeMaxNoLabel = Math.floor(w * h / circleSize((radMax - radMin) / 2 + radMin));
+        nodeMin = Math.floor(w * h / circleSize(radMin));
+      });
+      
+      it('should offer maximized values if no zoom happens', function() {
+        expect(manager.getFontSize()).toEqual(fontMax);
+        expect(manager.getRadius()).toEqual(radMax);
+        expect(manager.getNodeLimit()).toEqual(nodeMax);
+        expect(manager.getDistortion()).toBeCloseTo(0, 6);
+      });
+      
+      it('should not be possible to zoom in if max-zoom is reached', function() {
+        var oldFS = manager.getFontSize(),
+          oldR = manager.getRadius(),
+          oldNL = manager.getNodeLimit(),
+          oldD = manager.getDistortion();
+        manager.zoomIn();
+        expect(manager.getFontSize()).toEqual(oldFS);
+        expect(manager.getRadius()).toEqual(oldR);
+        expect(manager.getNodeLimit()).toEqual(oldNL);
+        expect(manager.getDistortion()).toEqual(oldD);
+      });
+      
+      it('should be possible to zoom-out until minimal font-size is reached', function() {
+        var oldFS,
+          oldR,
+          oldNL,
+          oldD,
+          loopCounter = 0;
+        while (manager.getFontSize() > fontMin && manager.getFontSize() !== null) {
+          oldFS = manager.getFontSize();
+          oldR = manager.getRadius();
+          oldNL = manager.getNodeLimit();
+          oldD = manager.getDistortion();
+          manager.zoomOut();
+          expect(manager.getFontSize()).toBeLessThan(oldFS);
+          expect(manager.getRadius()).toBeLessThan(oldR);
+          expect(manager.getNodeLimit()).toBeGreaterThan(oldNL);
+          expect(manager.getDistortion()).toBeGreaterThan(oldD);
+          loopCounter++;
+          if (loopCounter === 1000) {
+            this.fail(new Error('The minimal font-size should have been reached'));
+          }
+        }
+        if (manager.getFontSize() === null) {
+          manager.zoomIn();
+        }
+        expect(manager.getFontSize()).toBeCloseTo(fontMin, 6);
+        expect(manager.getRadius()).toBeCloseTo((radMax-radMin) / 2, 6);
+        expect(manager.getNodeLimit()).toBeCloseTo(nodeMinLabel, 6);
+        //expect(manager.getDistortion()).toBeCloseTo(0, 6);
+      });
+      
+      describe('with zoomlevel adjusted to minimal font-size', function() {
+        
+        beforeEach(function() {
+          var loopCounter = 0;
+          while (manager.getFontSize() > fontMin && manager.getFontSize() !== null) {
+            manager.zoomOut();
+            loopCounter++;
+            if (loopCounter === 1000) {
+              this.fail(new Error('The minimal font-size should have been reached'));
+            }
+          }
+          if (manager.getFontSize() === null) {
+            manager.zoomIn();
+          }
+        });
+        
+        it('should be able to zoom-in again', function() {
+          var oldFS,
+            oldR,
+            oldNL,
+            oldD,
+            loopCounter = 0;
+          while (manager.getFontSize() < fontMax) {
+            oldFS = manager.getFontSize();
+            oldR = manager.getRadius();
+            oldNL = manager.getNodeLimit();
+            oldD = manager.getDistortion();
+            manager.zoomIn();
+            expect(manager.getFontSize()).toBeGreaterThan(oldFS);
+            expect(manager.getRadius()).toBeGreaterThan(oldR);
+            expect(manager.getNodeLimit()).toBeLessThan(oldNL);
+            expect(manager.getDistortion()).toBeLessThan(oldD);
+            loopCounter++;
+            if (loopCounter === 1000) {
+              this.fail(new Error('The maximal font-size should have been reached'));
+            }
+          }
+          expect(manager.getFontSize()).toEqual(fontMax);
+          expect(manager.getRadius()).toEqual(radMax);
+          expect(manager.getNodeLimit()).toEqual(nodeMax);
+          expect(manager.getDistortion()).toBeCloseTo(0, 6);
+        });
+        
+        it('should return null for font-size if further zoomed out', function() {
+          manager.zoomOut();
+          expect(manager.getFontSize()).toEqual(null);
+        });
+        
+        it('should significantly increase the node limit if further zoomed out', function() {
+          manager.zoomOut();
+          expect(manager.getNodeLimit()).toEqual(nodeMaxNoLabel);
+        });
+        
+        it('should be able to zoom-out until minimal node radius is reached', function() {
+          var oldR,
+            oldNL,
+            oldD,
+            loopCounter = 0;
+          while (manager.getRadius > radMin) {
+            oldR = manager.getRadius();
+            oldNL = manager.getNodeLimit();
+            oldD = manager.getDistortion();
+            manager.zoomOut();
+            expect(manager.getFontSize()).toEqual(null);
+            expect(manager.getRadius()).toBeLessThan(oldR);
+            expect(manager.getNodeLimit()).toBeGreaterThan(oldNL);
+            expect(manager.getDistortion()).toBeGreaterThan(oldD);
+            loopCounter++;
+            if (loopCounter === 1000) {
+              this.fail(new Error('The minimal font-size should have been reached'));
+            }
+          }
+          if (manager.getFontSize() === null) {
+            manager.zoomIn();
+          }
+          expect(manager.getFontSize()).toBeCloseTo(fontMin, 6);
+          expect(manager.getRadius()).toBeCloseTo((radMax-radMin) / 2, 6);
+          expect(manager.getNodeLimit()).toBeCloseTo(nodeMinLabel, 6);
+          //expect(manager.getDistortion()).toBeCloseTo(0, 6);
+        });
+        
+      });
+      
+      describe('with zoomlevel adjusted to maximal zoom out', function() {
+        
+        beforeEach(function() {
+          var loopCounter = 0;
+          while (manager.getRadius > radMin) {
+            manager.zoomOut();
+            loopCounter++;
+            if (loopCounter === 2000) {
+              this.fail(new Error('The minimal zoom level should have been reached'));
+            }
+          }
+        });
+        
+      });
+      
     });
     
-    it('should offer a function for zoom-in', function() {
-      expect(manager.zoomIn).toBeDefined();
-      expect(manager.zoomIn).toEqual(Jasmine.any(Function));
-    });
-    
-    it('should offer a function for zoom-out', function() {
-      expect(manager.zoomOut).toBeDefined();
-      expect(manager.zoomOut).toEqual(Jasmine.any(Function));
-    });
-    
-    
-    
+  });
+
+  describe('testing user-defined values', function() {
     
   });