Rename test so that surefire report of different modules do not collide

jzy3d-native-jogl-awt/src/test/java/org/jzy3d/painters/TestNativeDesktopPainter_AWT.java

@@ -6,7 +6,7 @@ import org.junit.Test;
 import org.jzy3d.os.WindowingToolkit;
 import org.jzy3d.plot3d.rendering.canvas.CanvasAWT;
 
-public class TestNativeDesktopPainter {
+public class TestNativeDesktopPainter_AWT {
   @Test
   public void detectAWT() {
     NativeDesktopPainter p = new NativeDesktopPainter();

jzy3d-native-jogl-core/src/test/java/org/jzy3d/painters/TestNativeDesktopPainter_Offscreen.java

@@ -0,0 +1,18 @@
+package org.jzy3d.painters;
+
+import static org.mockito.Mockito.mock;
+import org.junit.Assert;
+import org.junit.Test;
+import org.jzy3d.os.WindowingToolkit;
+import org.jzy3d.plot3d.rendering.canvas.OffscreenCanvas;
+
+public class TestNativeDesktopPainter_Offscreen {
+  @Test
+  public void detectAWT() {
+    NativeDesktopPainter p = new NativeDesktopPainter();
+    
+    p.setCanvas(mock(OffscreenCanvas.class));
+    
+    Assert.assertEquals(WindowingToolkit.Offscreen, p.getWindowingToolkit());
+  }
+}

jzy3d-native-jogl-swing/src/test/java/org/jzy3d/painters/TestNativeDesktopPainter_Swing.java

@@ -6,7 +6,7 @@ import org.junit.Test;
 import org.jzy3d.os.WindowingToolkit;
 import org.jzy3d.plot3d.rendering.canvas.CanvasSwing;
 
-public class TestNativeDesktopPainter {
+public class TestNativeDesktopPainter_Swing {
   @Test
   public void detectSwing() {
     NativeDesktopPainter p = new NativeDesktopPainter();

jzy3d-native-jogl-swt/src/test/java/org/jzy3d/painters/TestNativeDesktopPainter_SWT.java

@@ -6,7 +6,7 @@ import org.junit.Test;
 import org.jzy3d.chart.factories.CanvasNewtSWT;
 import org.jzy3d.os.WindowingToolkit;
 
-public class TestNativeDesktopPainter {
+public class TestNativeDesktopPainter_SWT {
   @Test
   public void detectSwt() {
     NativeDesktopPainter p = new NativeDesktopPainter();