diff --git a/AWT startup.iml b/AWT startup.iml
index 8433b9d..c6c44f2 100644
--- a/AWT startup.iml	
+++ b/AWT startup.iml	
@@ -5,8 +5,25 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/resources" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module-library" scope="TEST">
+      <library name="JUnit5.4">
+        <CLASSES>
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter/5.4.2/junit-jupiter-5.4.2.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.4.2/junit-jupiter-api-5.4.2.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.0.0/apiguardian-api-1.0.0.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.1.1/opentest4j-1.1.1.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.4.2/junit-platform-commons-1.4.2.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-params/5.4.2/junit-jupiter-params-5.4.2.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-engine/5.4.2/junit-jupiter-engine-5.4.2.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-engine/1.4.2/junit-platform-engine-1.4.2.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
   </component>
 </module>
\ No newline at end of file
diff --git a/src/guiTree/Visual.java b/src/guiTree/Visual.java
index 22e68c2..c547217 100644
--- a/src/guiTree/Visual.java
+++ b/src/guiTree/Visual.java
@@ -128,10 +128,10 @@ public class Visual {
 
     public void setSize() {
         if(parent != null) {
-            if(relativeWidth > 0.0) {
+            if(relativeWidth >= 0.0) {
                 width = Math.round(relativeWidth * parent.width);
             }
-            if(relativeHeight > 0.0) {
+            if(relativeHeight >= 0.0) {
                 height = Math.round(relativeHeight * parent.height);
             }
 
@@ -182,10 +182,12 @@ public class Visual {
 
     public void setMargins(Integer up, Integer down, Integer left, Integer right) {
         locationPlacer.setMargins(up, down, left, right);
+        setLocation();
     }
 
     public void setMargins(Integer margin) {
         locationPlacer.setMargins(margin);
+        setLocation();
     }
 
     public void setLocation() {
@@ -470,13 +472,14 @@ public class Visual {
             return;
         }
         this.children.remove(child);
-        child.setParent(null);
+        child.parent = null;
         child.imageBuffer = null;
         child.deactivate();
         update();
     }
 
     private void setParent(Visual parent) {
+        locationPlacer.setParentSize(parent.width, parent.height);
         this.parent = parent;
     }
 
diff --git a/test/guiTree/VisualTest.java b/test/guiTree/VisualTest.java
new file mode 100644
index 0000000..81043ba
--- /dev/null
+++ b/test/guiTree/VisualTest.java
@@ -0,0 +1,211 @@
+package guiTree;
+
+import guiTree.events.MouseAdapter;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import javax.swing.*;
+import java.awt.event.MouseEvent;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class VisualTest {
+
+    private Visual visual;
+
+    @BeforeEach
+    void setUp() {
+        visual = new Visual();
+    }
+
+    @Test
+    void addVisual() {
+        Visual child = new Visual();
+        child.setName("child");
+        visual.addVisual(child);
+        Visual exportedChild = visual.findByName(child.getName());
+        visual.addVisual(child);
+        assertEquals(child, exportedChild);
+    }
+
+    @Test
+    void removeVisual() {
+        Visual child = new Visual();
+        child.setName("child");
+        visual.addVisual(child);
+        Visual inserted = visual.findByName(child.getName());
+        assertNotNull(inserted);
+        visual.removeVisual(child);
+        inserted = visual.findByName(child.getName());
+        assertNull(inserted);
+    }
+
+    @Test
+    void setSize() {
+        int width = 100;
+        int height = 100;
+        visual.setSize(width, height);
+        assertEquals(visual.getHeight(), height);
+        assertEquals(visual.getWidth(), width);
+
+        Visual child = new Visual();
+        visual.addVisual(child);
+
+        child.setSize(0.0f, 0.0f);
+        width = 0;
+        height = 0;
+        assertEquals(child.getHeight(), height);
+        assertEquals(child.getWidth(), width);
+
+
+        child.setSize(0.5f, 0.5f);
+        width = 50;
+        height = 50;
+        assertEquals(child.getHeight(), height);
+        assertEquals(child.getWidth(), width);
+
+
+        child.setSize(0.75f, 0.75f);
+        width = 75;
+        height = 75;
+        assertEquals(child.getHeight(), height);
+        assertEquals(child.getWidth(), width);
+
+        child.setSize(1.0f, 1.0f);
+        width = 100;
+        height = 100;
+        assertEquals(child.getHeight(), height);
+        assertEquals(child.getWidth(), width);
+
+        child.setSize(-1f, -1f);
+        child.setSize(1, 1);
+        width = 1;
+        height = 1;
+        assertEquals(child.getHeight(), height);
+        assertEquals(child.getWidth(), width);
+    }
+
+    @Test
+    void setLocation() {
+        visual.setSize(100, 100);
+        Visual child = new Visual();
+        visual.addVisual(child);
+
+        child.setLocation(50, 75);
+        assertEquals(50, child.getLocationX());
+        assertEquals(75, child.getLocationY());
+
+        child.setLocation(0.0f, 0.0f);
+        assertEquals(0, child.getLocationX());
+        assertEquals(0, child.getLocationY());
+
+        child.setLocation(0.5f, 0.75f);
+        assertEquals(50, child.getLocationX());
+        assertEquals(75, child.getLocationY());
+
+        child.setLocation("top_left");
+        child.setMargins(50);
+        assertEquals(50, child.getLocationX());
+        assertEquals(50, child.getLocationY());
+
+        child.setLocation("top_center");
+        child.setMargins(0);
+        assertEquals(49, child.getLocationX());
+        assertEquals(0, child.getLocationY());
+
+        child.setLocation("top_right");
+        assertEquals(99, child.getLocationX());
+        assertEquals(0, child.getLocationY());
+
+        child.setLocation("middle_left");
+        assertEquals(0, child.getLocationX());
+        assertEquals(49, child.getLocationY());
+
+        child.setLocation("middle_center");
+        assertEquals(49, child.getLocationX());
+        assertEquals(49, child.getLocationY());
+
+        child.setLocation("middle_right");
+        assertEquals(99, child.getLocationX());
+        assertEquals(49, child.getLocationY());
+
+        child.setLocation("bottom_left");
+        assertEquals(0, child.getLocationX());
+        assertEquals(99, child.getLocationY());
+
+        child.setLocation("bottom_center");
+        assertEquals(49, child.getLocationX());
+        assertEquals(99, child.getLocationY());
+
+        child.setLocation("bottom_right");
+        assertEquals(99, child.getLocationX());
+        assertEquals(99, child.getLocationY());
+    }
+
+    @Test
+    void mouseEvents() {
+        MouseEvent mouseEvent = new MouseEvent(new JPanel(), 0, 0, 0, 20, 20, 0, false);
+        Visual child = new Visual(50, 50);
+        Visual child2 = new Visual(100, 25);
+
+        visual.addVisual(child);
+        visual.addVisual(child2);
+
+        final Boolean[] activatedChild = {false};
+        final Boolean[] activatedChild2 = {false};
+        final Boolean[] activatedVisual = {false};
+
+        child.addMouseListener(new MouseAdapter() {
+            @Override
+            public void mouseMoved(MouseEvent mouseEvent) {
+                activatedChild[0] = true;
+            }
+        });
+
+        child2.addMouseListener(new MouseAdapter() {
+            @Override
+            public void mouseMoved(MouseEvent mouseEvent) {
+                activatedChild2[0] = true;
+            }
+        });
+
+        visual.addMouseListener(new MouseAdapter() {
+            @Override
+            public void mouseMoved(MouseEvent mouseEvent) {
+                activatedVisual[0] = true;
+            }
+        });
+
+        visual.mouseMoved(mouseEvent);
+        assertEquals(false, activatedChild[0]);
+        assertEquals(true, activatedChild2[0]);
+        assertEquals(false, activatedVisual[0]);
+        activatedChild[0] = false;
+        activatedChild2[0] = false;
+        activatedVisual[0] = false;
+
+        mouseEvent = new MouseEvent(mouseEvent.getComponent(), mouseEvent.getID(), mouseEvent.getWhen(), mouseEvent.getModifiers(), 75, 20, 0, false);
+        visual.mouseMoved(mouseEvent);
+        assertEquals(false, activatedChild[0]);
+        assertEquals(true, activatedChild2[0]);
+        assertEquals(false, activatedVisual[0]);
+        activatedChild[0] = false;
+        activatedChild2[0] = false;
+        activatedVisual[0] = false;
+
+        mouseEvent = new MouseEvent(mouseEvent.getComponent(), mouseEvent.getID(), mouseEvent.getWhen(), mouseEvent.getModifiers(), 25, 40, 0, false);
+        visual.mouseMoved(mouseEvent);
+        assertEquals(true, activatedChild[0]);
+        assertEquals(false, activatedChild2[0]);
+        assertEquals(false, activatedVisual[0]);
+        activatedChild[0] = false;
+        activatedChild2[0] = false;
+        activatedVisual[0] = false;
+
+        mouseEvent = new MouseEvent(mouseEvent.getComponent(), mouseEvent.getID(), mouseEvent.getWhen(), mouseEvent.getModifiers(), 75, 75, 0, false);
+        visual.mouseMoved(mouseEvent);
+        assertEquals(false, activatedChild[0]);
+        assertEquals(false, activatedChild2[0]);
+        assertEquals(true, activatedVisual[0]);
+    }
+}