Add Illegalargumentexception to AffineTransform2D, add negative test.

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenCompilerTasksManager">
+    <option name="afterCompileTasks">
+      <set>
+        <MavenCompilerTask>
+          <option name="goal" value="install" />
+          <option name="projectPath" value="$PROJECT_DIR$/pom.xml" />
+        </MavenCompilerTask>
+      </set>
+    </option>
+  </component>
   <component name="MavenProjectsManager">
     <option name="originalFiles">
       <list>

.idea/vcs.xml

@@ -8,5 +8,6 @@
   </component>
   <component name="VcsDirectoryMappings">
     <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/idatt2003" vcs="Git" />
   </component>
 </project>
\ No newline at end of file

src/main/java/edu/ntnu/stud/chaosgame/model/transformations/AffineTransform2D.java

@@ -29,6 +29,11 @@ public class AffineTransform2D extends Transform2D {
      * @param inputVector A vector {@link Vector2D} which defines the vector-addition part of the affine transformation.
      */
     public AffineTransform2D(Matrix2x2 inputMatrix, Vector2D inputVector){
+        if (inputMatrix == null){
+            throw new IllegalArgumentException("Input matrix should not be null");
+        } else if (inputVector == null) {
+            throw new IllegalArgumentException("Input vector should not be null");
+        }
         this.matrix = inputMatrix;
         this.vector = inputVector;
     }
@@ -39,6 +44,9 @@ public class AffineTransform2D extends Transform2D {
      * @return A new vector {@link Vector2D} which represents a point on a plane. The point represents a new step in the creation of fractal.
      */
     public Vector2D transform(Vector2D point){
+        if (point == null){
+            throw new IllegalArgumentException("Input should not be null");
+        }
 
         return matrix.multiply(point).add(vector);
     }

src/test/java/edu/ntnu/stud/chaosgame/transformations/AffineTransform2DTest.java

@@ -20,8 +20,6 @@ class AffineTransform2DTest {
 
     @BeforeEach
     void setUp() {
-
-
         matrix2x2 = new Matrix2x2(0.5,1,1,0.5);
         vector2D = new Vector2D(3,1);
         affineTransform2D = new AffineTransform2D(matrix2x2,vector2D);
@@ -54,4 +52,15 @@ class AffineTransform2DTest {
             assertEquals(vector2D, actual, "The getVector method should return the correct vector");
         }
     }
-}
\ No newline at end of file
+    @Nested
+    @DisplayName("Negative Affine Transform Tests")
+    class NegativeAffineTransform2DTests{
+    @Test
+    void transformWithNullInput() {
+        assertThrows(IllegalArgumentException.class, () -> affineTransform2D.transform(null),
+        "The transform method should throw IllegalArgumentException when the input is null");
+        }
+
+
+    }
+    }

src/test/java/edu/ntnu/stud/chaosgame/transformations/JuliaTransformTest.java

@@ -14,7 +14,6 @@ class JuliaTransformTest {
 
 
     Complex complex;
-    Matrix2x2 matrix2x2;
     Vector2D vector2D;
     JuliaTransform juliaTransform;
 
@@ -37,7 +36,7 @@ class JuliaTransformTest {
         }
         @Test
         void transform(){
-            Vector2D expected = new Vector2D(1.866,0.428);
+            Vector2D expected = new Vector2D(1.647,0.12138);
             Vector2D actual = juliaTransform.transform(vector2D);
             assertEquals(expected.getX0(),actual.getX0(),0.01);
             assertEquals(expected.getX1(),actual.getX1(),0.01);
@@ -52,9 +51,6 @@ class JuliaTransformTest {
              JuliaTransform juliaTransformZeroSign = new JuliaTransform(complex,0);
              assertEquals(vector2D.getX0(),juliaTransformZeroSign.transform(vector2D).getX0());
              assertEquals(vector2D.getX1(),juliaTransformZeroSign.transform(vector2D).getX1());
-
-
-
         }
     }
 }
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