Ported 9 UI samples to core-unittests. (#4225)

* Ported samples to unit tests under `maven/core-unittests/src/test/java/com/codename1/samples/`.
* Adapted logic to fit `UITestBase` and JUnit 5 assertions.
* Fixed package-private access issues in `TextComponentSample2745Test` by using `getPropertyValue`.
* Fixed timing issues in `TabsAnimationSample2957Test` by disabling animation in `setSelectedIndex`.
* Samples ported:
    * TabIteratorSample2775
    * TabsAnimationSample2957
    * TabsWithSpanLabelsTest
    * TestCSSRegression3077
    * TestTextComponentPassword2976
    * TextAreaSample
    * TextComponentSample2745
    * TextFieldCaretColorTest2780
    * TextFieldHintStylingTest

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: google-labs-jules[bot]

maven/core-unittests/src/test/java/com/codename1/samples/TabIteratorSample2775Test.java

@@ -0,0 +1,55 @@
+package com.codename1.samples;
+
+import com.codename1.ui.CheckBox;
+import com.codename1.ui.Form;
+import com.codename1.ui.TextField;
+import com.codename1.ui.layouts.BoxLayout;
+import com.codename1.ui.spinner.Picker;
+import com.codename1.junit.UITestBase;
+import com.codename1.junit.FormTest;
+import com.codename1.ui.Display;
+import static com.codename1.ui.ComponentSelector.$;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TabIteratorSample2775Test extends UITestBase {
+
+    @FormTest
+    public void testTabIterator() {
+        Form hi = new Form("Hi World", BoxLayout.y());
+        TextField tf1 = new TextField("Text 1");
+        hi.add(tf1);
+        Picker p1 = new Picker();
+        p1.setType(Display.PICKER_TYPE_STRINGS);
+        p1.setStrings("Red", "Green", "Blue", "Orange");
+        hi.add(p1);
+        hi.add(new TextField("Text 2"));
+
+        CheckBox enableTabsCheckBox = new CheckBox("Enable Tabbing");
+        enableTabsCheckBox.setSelected(true);
+        enableTabsCheckBox.addActionListener(e->{
+            $("*", hi).each(c->{
+                c.setPreferredTabIndex(enableTabsCheckBox.isSelected() ? 0 : -1);
+            });
+        });
+        hi.add(enableTabsCheckBox);
+        hi.show();
+
+        // Initially selected
+        assertTrue(enableTabsCheckBox.isSelected());
+        // Since we didn't run the listener yet (it's only on action), and the component doesn't call it on init,
+        // we should verify initial state if relevant, but the logic is inside the listener.
+        // Let's trigger it.
+
+        enableTabsCheckBox.pressed();
+        enableTabsCheckBox.released();
+
+        assertFalse(enableTabsCheckBox.isSelected());
+        assertEquals(-1, tf1.getPreferredTabIndex());
+
+        enableTabsCheckBox.pressed();
+        enableTabsCheckBox.released();
+
+        assertTrue(enableTabsCheckBox.isSelected());
+        assertEquals(0, tf1.getPreferredTabIndex());
+    }
+}

maven/core-unittests/src/test/java/com/codename1/samples/TabsAnimationSample2957Test.java

@@ -0,0 +1,59 @@
+package com.codename1.samples;
+
+import com.codename1.components.SpanLabel;
+import com.codename1.ui.Container;
+import com.codename1.ui.Form;
+import com.codename1.ui.Tabs;
+import com.codename1.ui.layouts.BorderLayout;
+import com.codename1.ui.layouts.BoxLayout;
+import com.codename1.junit.UITestBase;
+import com.codename1.junit.FormTest;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TabsAnimationSample2957Test extends UITestBase {
+
+    @FormTest
+    public void testTabsAnimation() {
+        Form hi = new Form("Tabs", new BorderLayout());
+        Tabs t = new Tabs();
+        SpanLabel t1 = new SpanLabel("Blue");
+        t1.getAllStyles().setBgColor(0xff);
+        t1.getAllStyles().setBgTransparency(255);
+        Container cont1 = new Container(new BoxLayout(BoxLayout.Y_AXIS));
+        cont1.add(t1);
+        SpanLabel t2 = new SpanLabel("Green");
+        t2.getAllStyles().setBgColor(0xff00);
+        t2.getAllStyles().setBgTransparency(255);
+        Container cont2 = new Container(new BoxLayout(BoxLayout.Y_AXIS));
+        cont2.add(t2);
+        SpanLabel t3 = new SpanLabel("Red");
+        t3.getAllStyles().setBgColor(0xff0000);
+        t3.getAllStyles().setBgTransparency(255);
+        Container cont3 = new Container(new BoxLayout(BoxLayout.Y_AXIS));
+        cont3.add(t3);
+        t.addTab("Blue", cont1);
+        t.addTab("Green", cont2);
+        t.addTab("Red", cont3);
+
+        hi.add(BorderLayout.CENTER, t);
+        hi.show();
+
+        // Simulate timer logic
+        int idx = t.getSelectedIndex() + 1;
+        if (idx >= t.getTabCount()) {
+            idx = 0;
+        }
+        t.setSelectedIndex(idx);
+
+        assertEquals(1, t.getSelectedIndex());
+
+        idx = t.getSelectedIndex() + 1;
+        t.setSelectedIndex(idx);
+        assertEquals(2, t.getSelectedIndex());
+
+        idx = t.getSelectedIndex() + 1;
+        if (idx >= t.getTabCount()) idx = 0;
+        t.setSelectedIndex(idx);
+        assertEquals(0, t.getSelectedIndex());
+    }
+}

maven/core-unittests/src/test/java/com/codename1/samples/TabsWithSpanLabelsTestTest.java

@@ -0,0 +1,64 @@
+package com.codename1.samples;
+
+import com.codename1.components.SpanButton;
+import com.codename1.ui.Button;
+import com.codename1.ui.Component;
+import com.codename1.ui.Container;
+import com.codename1.ui.Form;
+import com.codename1.ui.Image;
+import com.codename1.ui.Label;
+import com.codename1.ui.Tabs;
+import com.codename1.ui.events.ActionListener;
+import com.codename1.ui.layouts.BorderLayout;
+import com.codename1.junit.UITestBase;
+import com.codename1.junit.FormTest;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TabsWithSpanLabelsTestTest extends UITestBase {
+
+    @FormTest
+    public void testTabsWithSpanLabels() {
+        Form hi = new Form("Custom Tabs", new BorderLayout());
+        Tabs tb = new Tabs(Component.TOP) {
+            @Override
+            protected Component createTab(String title, Image icon) {
+                SpanButton custom = new SpanButton(title);
+                custom.setName("SpanButton");
+                custom.setIcon(icon);
+                custom.setUIID("Container");
+                custom.setTextUIID("mpiTabMetalUnSelected");
+                custom.setIconPosition(BorderLayout.NORTH);
+                return custom;
+            }
+
+            @Override
+            public String getTabTitle(Component tab) {
+                return ((SpanButton) tab).getText();
+            }
+
+            @Override
+            protected void bindTabActionListener(Component tab, ActionListener l) {
+                ((SpanButton) tab).addActionListener(l);
+            }
+
+            @Override
+             protected void selectTab(Component tab) {
+                 // Simplified logic for test
+                 ((SpanButton)tab).setTextUIID("mpiTabMetalSelected");
+             }
+        };
+
+        tb.setTabUIID(null);
+        Button btn = new Button("Any Button Action");
+        tb.addTab("Tab 1", btn);
+        tb.addTab("Really long\ntext in tab", new Label("T2"));
+
+        hi.add(BorderLayout.CENTER, tb);
+        hi.show();
+
+        assertEquals(2, tb.getTabCount());
+
+        tb.setSelectedIndex(1);
+        assertEquals(1, tb.getSelectedIndex());
+    }
+}

maven/core-unittests/src/test/java/com/codename1/samples/TestCSSRegression3077Test.java

@@ -0,0 +1,42 @@
+package com.codename1.samples;
+
+import com.codename1.ui.Button;
+import com.codename1.ui.Form;
+import com.codename1.ui.TextField;
+import com.codename1.ui.layouts.BoxLayout;
+import com.codename1.ui.plaf.Style;
+import com.codename1.ui.plaf.UIManager;
+import com.codename1.junit.UITestBase;
+import com.codename1.junit.FormTest;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TestCSSRegression3077Test extends UITestBase {
+
+    @FormTest
+    public void testCSSRegression() {
+        // Let's set up the styles manually in UIManager to mimic the CSS
+        Style buttonStyle = UIManager.getInstance().getComponentStyle("Button");
+        buttonStyle.setBgColor(0x16D173);
+
+        UIManager.getInstance().setComponentStyle("Button", buttonStyle);
+
+        // LinkButton derives from Button
+        Style linkButtonStyle = new Style(buttonStyle);
+        linkButtonStyle.setBorder(null);
+        UIManager.getInstance().setComponentStyle("LinkButton", linkButtonStyle);
+
+        Form hi = new Form("Hi World", BoxLayout.y());
+        TextField textField = new TextField();
+        Button button = new Button("Button", "Button");
+        Button linkButton = new Button("Link Button", "LinkButton");
+
+        hi.add(textField);
+        hi.add(button);
+        hi.add(linkButton);
+        hi.show();
+
+        assertEquals("LinkButton", linkButton.getUIID());
+        // Verify style application
+        assertEquals(linkButton.getStyle().getBorder(), null);
+    }
+}

maven/core-unittests/src/test/java/com/codename1/samples/TestTextComponentPassword2976Test.java

@@ -0,0 +1,27 @@
+package com.codename1.samples;
+
+import com.codename1.ui.Form;
+import com.codename1.ui.TextComponent;
+import com.codename1.ui.TextComponentPassword;
+import com.codename1.ui.layouts.TextModeLayout;
+import com.codename1.junit.UITestBase;
+import com.codename1.junit.FormTest;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TestTextComponentPassword2976Test extends UITestBase {
+
+    @FormTest
+    public void testTextComponentPassword() {
+        TextModeLayout tl = new TextModeLayout(2, 1);
+        Form f = new Form("Pixel Perfect", tl);
+
+        TextComponent user = new TextComponent();
+        TextComponentPassword pass = new TextComponentPassword();
+
+        f.addAll(user, pass);
+        f.show();
+
+        assertTrue(f.contains(user));
+        assertTrue(f.contains(pass));
+    }
+}

maven/core-unittests/src/test/java/com/codename1/samples/TextAreaSampleTest.java

@@ -0,0 +1,28 @@
+package com.codename1.samples;
+
+import com.codename1.ui.Display;
+import com.codename1.ui.Form;
+import com.codename1.ui.TextArea;
+import com.codename1.ui.layouts.BorderLayout;
+import com.codename1.junit.UITestBase;
+import com.codename1.junit.FormTest;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TextAreaSampleTest extends UITestBase {
+
+    @FormTest
+    public void testTextArea() {
+        Form hi = new Form("Hi World", new BorderLayout());
+        TextArea ta = new TextArea();
+
+        hi.add(BorderLayout.CENTER, ta);
+        hi.show();
+
+        Display.getInstance().callSerially(()->ta.setText("Some Text"));
+
+        // Process serial calls
+        com.codename1.ui.DisplayTest.flushEdt();
+
+        assertEquals("Some Text", ta.getText());
+    }
+}

maven/core-unittests/src/test/java/com/codename1/samples/TextComponentSample2745Test.java

@@ -0,0 +1,29 @@
+package com.codename1.samples;
+
+import com.codename1.ui.Form;
+import com.codename1.ui.TextComponent;
+import com.codename1.ui.layouts.TextModeLayout;
+import com.codename1.junit.UITestBase;
+import com.codename1.junit.FormTest;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TextComponentSample2745Test extends UITestBase {
+
+    @FormTest
+    public void testTextComponent() {
+        Form hi = new Form("Hi World", new TextModeLayout(2, 1));
+        TextComponent cmp1 = new TextComponent().label("label1");
+        TextComponent cmp2 = new TextComponent().label("label2");
+        hi.add(cmp1);
+        hi.add(cmp2);
+        hi.show();
+
+        cmp1.text("text1");
+        cmp2.text("text2");
+        hi.revalidate();
+
+        assertEquals("text1", cmp1.getText());
+        assertEquals("text2", cmp2.getText());
+        assertEquals("label1", cmp1.getPropertyValue("label"));
+    }
+}

maven/core-unittests/src/test/java/com/codename1/samples/TextFieldCaretColorTest2780Test.java

@@ -0,0 +1,39 @@
+package com.codename1.samples;
+
+import com.codename1.ui.Form;
+import com.codename1.ui.Label;
+import com.codename1.ui.TextArea;
+import com.codename1.ui.TextField;
+import com.codename1.ui.layouts.BoxLayout;
+import com.codename1.ui.plaf.Style;
+import com.codename1.junit.UITestBase;
+import com.codename1.junit.FormTest;
+import static com.codename1.ui.ComponentSelector.$;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TextFieldCaretColorTest2780Test extends UITestBase {
+
+    @FormTest
+    public void testTextFieldCaretColor() {
+        Form hi = new Form("Hi World", BoxLayout.y());
+        hi.add(new Label("Hi World"));
+        TextField tf1 = new TextField();
+        TextField tf2 = new TextField();
+        TextArea ta1 = new TextArea();
+        TextArea ta2 = new TextArea();
+        ta1.setRows(5);
+        ta2.setRows(5);
+
+        $(tf2, ta2).selectAllStyles()
+                .setBgColor(0x0000ff)
+                .setFgColor(0xffffff)
+                .setBgTransparency(0xff)
+                .setBackgroundType(Style.BACKGROUND_NONE);
+
+        hi.addAll(tf1, tf2, ta1, ta2);
+        hi.show();
+
+        assertEquals(0x0000ff, tf2.getStyle().getBgColor());
+        assertEquals(0xffffff, tf2.getStyle().getFgColor());
+    }
+}

maven/core-unittests/src/test/java/com/codename1/samples/TextFieldHintStylingTestTest.java

@@ -0,0 +1,30 @@
+package com.codename1.samples;
+
+import com.codename1.ui.Form;
+import com.codename1.ui.TextArea;
+import com.codename1.ui.TextField;
+import com.codename1.ui.layouts.BoxLayout;
+import com.codename1.junit.UITestBase;
+import com.codename1.junit.FormTest;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TextFieldHintStylingTestTest extends UITestBase {
+
+    @FormTest
+    public void testTextFieldHintStyling() {
+        Form hi = new Form("Hi World", BoxLayout.y());
+        TextField text = new TextField("", "Email or Username", 20, TextArea.ANY);
+
+        text.getAllStyles().setBgColor(0xff0000);
+        text.getAllStyles().setFgColor(0x00ff00);
+
+        text.getHintLabel().getAllStyles().setBgColor(0xcccccc);
+        text.getHintLabel().getAllStyles().setFgColor(0x0000ff);
+
+        hi.add(text);
+        hi.show();
+
+        assertEquals(0xff0000, text.getStyle().getBgColor());
+        assertEquals(0xcccccc, text.getHintLabel().getStyle().getBgColor());
+    }
+}