Add ShapeTests for Processing4 core module

core/test/processing/ShapeTests.java

@@ -0,0 +1,35 @@
+package processing;
+import org.junit.Test;
+import static org.junit.Assert.*;
+import processing.core.PGraphics;
+
+public class ShapeTests {
+
+    @Test
+    public void testCanvasWidthAfterSetSize() {
+        // Create a PGraphics object and set its size
+        PGraphics pg = new PGraphics();
+        pg.setSize(200, 100); // canvas size
+
+        pg.beginDraw();
+        pg.rect(10, 10, 100, 50); // draw a rectangle
+        pg.endDraw();
+
+        // Assert that the canvas width is 200 (not the rect width)
+        assertEquals(200, pg.width);
+    }
+
+    @Test
+    public void testCanvasHeightAfterSetSize() {
+        // Create a PGraphics object and set its size
+        PGraphics pg = new PGraphics();
+        pg.setSize(300, 150); // canvas size
+
+        pg.beginDraw();
+        pg.rect(20, 20, 50, 25); // draw another rectangle
+        pg.endDraw();
+
+        // Assert that the canvas height is 150
+        assertEquals(150, pg.height);
+    }
+}