Problem solved

SumOfInput.java

@@ -20,7 +20,12 @@ public SumOfInput()
 
     public Integer oneToNumber(Integer numberToSum){
 
-        return sum;
+        for (int i = 0; i <= numberToSum; i++) {
+            sum += i;
+        }
+        int x = sum;
+        sum = 0;
+        return x;
     }
 
 }

SumOfInputTest.java

@@ -20,6 +20,7 @@ public class SumOfInputTest
     //in the class?
     public SumOfInputTest()
     {
+        Integer sum = 0;
     }
 
     @Before

package.bluej

@@ -1,32 +1,48 @@
 #BlueJ package file
-editor.fx.0.height=0
-editor.fx.0.width=0
-editor.fx.0.x=0
-editor.fx.0.y=0
+dependency1.from=SumOfInputTest
+dependency1.to=SumOfInput
+dependency1.type=UsesDependency
+editor.fx.0.height=553
+editor.fx.0.width=775
+editor.fx.0.x=464
+editor.fx.0.y=88
 objectbench.height=164
-objectbench.width=776
-package.divider.horizontal=0.6
-package.divider.vertical=0.6845018450184502
-package.editor.height=364
-package.editor.width=674
-package.editor.x=-816
-package.editor.y=445
-package.frame.height=600
-package.frame.width=800
-package.numDependencies=0
-package.numTargets=1
+objectbench.width=354
+package.divider.horizontal=0.5757575757575758
+package.divider.vertical=0.5947867298578199
+package.editor.height=244
+package.editor.width=530
+package.editor.x=247
+package.editor.y=160
+package.frame.height=486
+package.frame.width=647
+package.numDependencies=1
+package.numTargets=3
 package.showExtends=true
 package.showUses=true
 project.charset=UTF-8
-readme.height=58
+readme.height=60
 readme.name=@README
-readme.width=47
+readme.width=48
 readme.x=10
 readme.y=10
-target1.height=50
-target1.name=Main
+target1.height=70
+target1.name=SumOfInput
 target1.showInterface=false
 target1.type=ClassTarget
-target1.width=80
-target1.x=70
-target1.y=10
+target1.width=120
+target1.x=10
+target1.y=90
+target2.height=70
+target2.name=SumOfInputTest
+target2.showInterface=false
+target2.type=UnitTestTargetJunit4
+target2.width=120
+target2.x=140
+target2.y=90
+target3.height=70
+target3.name=README.md
+target3.type=TextTarget
+target3.width=120
+target3.x=130
+target3.y=10