added collapsiblePanelTest

src/test/java/com/marginallyclever/makelangelo/CollapsiblePanelTest.java

@@ -0,0 +1,50 @@
+package com.marginallyclever.makelangelo;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import javax.swing.*;
+import java.awt.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class CollapsiblePanelTest {
+
+    private CollapsiblePanel collapsiblePanel;
+    private JFrame testFrame;
+
+    @BeforeEach
+    void setUp() {
+        testFrame = new JFrame();
+        collapsiblePanel = new CollapsiblePanel(testFrame, "Test Panel", 400, true);
+    }
+
+
+    @Test
+    void testAddComponent() {
+        JButton testButton = new JButton("Test Button");
+        collapsiblePanel.add(testButton);
+        assertEquals(1, collapsiblePanel.getComponentCount(), "There should be one component in the panel.");
+        assertFalse(testButton.isVisible(), "The component should be hidden by default.");
+    }
+
+    @Test
+    void testToggleVisibility() {
+        JButton testButton = new JButton("Test Button");
+        collapsiblePanel.add(testButton);
+
+        // Simulate click to expand
+        collapsiblePanel.toggleVisibility(true);
+        assertTrue(testButton.isVisible(), "The button should be visible after expanding.");
+
+        // Simulate click to collapse
+        collapsiblePanel.toggleVisibility(false);
+        assertFalse(testButton.isVisible(), "The button should be hidden after collapsing.");
+    }
+
+    @Test
+    void testSetTitle() {
+        collapsiblePanel.setTitle("New Title");
+        assertEquals("New Title", collapsiblePanel.getTitle(), "The title should be updated.");
+    }
+}