Add example for finding ok button.

assertj-swing-aut/src/main/java/org/assertj/swing/aut/lookup/SimpleFrame.java

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+package org.assertj.swing.aut.lookup;
+
+import javax.swing.JButton;
+
+import net.miginfocom.layout.AC;
+import net.miginfocom.layout.LC;
+
+import org.assertj.swing.aut.components.SampleFrame;
+
+public class SimpleFrame extends SampleFrame {
+  private static final long serialVersionUID = 1L;
+
+  public SimpleFrame() {
+    setMiglayout(new LC().wrapAfter(1), new AC().align("center"), new AC());
+
+    JButton okButton = new JButton("OK");
+    okButton.setName("ok");
+
+    add(okButton);
+
+    pack();
+  }
+}

assertj-swing-junit-examples/src/test/java/org/assertj/swing/junit/examples/lookup/SimpleFrame_GenericTypeMatcher_Test.java

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+package org.assertj.swing.junit.examples.lookup;
+
+import javax.swing.JButton;
+
+import org.assertj.swing.aut.lookup.SimpleFrame;
+import org.assertj.swing.core.GenericTypeMatcher;
+import org.assertj.swing.edt.GuiActionRunner;
+import org.assertj.swing.edt.GuiQuery;
+import org.assertj.swing.fixture.FrameFixture;
+import org.assertj.swing.junit.SwingJUnitExamples;
+import org.junit.Test;
+
+public class SimpleFrame_GenericTypeMatcher_Test extends SwingJUnitExamples {
+  private FrameFixture window;
+
+  @Override
+  protected void onSetUp() {
+    SimpleFrame frame = GuiActionRunner.execute(new GuiQuery<SimpleFrame>() {
+      protected SimpleFrame executeInEDT() {
+        return new SimpleFrame();
+      }
+    });
+    window = new FrameFixture(robot(), frame);
+    window.show();
+  }
+
+  @Test
+  public void shoulFindOkButton() {
+    GenericTypeMatcher<JButton> textMatcher = new GenericTypeMatcher<JButton>(JButton.class) {
+      @Override
+      protected boolean isMatching(JButton button) {
+        return "OK".equals(button.getText());
+      }
+    };
+    window.button(textMatcher).requireVisible();
+  }
+}

assertj-swing-testng-examples/src/test/java/org/assertj/swing/testng/examples/lookup/SimpleFrame_GenericTypeMatcher_Test.java

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+package org.assertj.swing.testng.examples.lookup;
+
+import javax.swing.JButton;
+
+import org.assertj.swing.aut.lookup.SimpleFrame;
+import org.assertj.swing.core.GenericTypeMatcher;
+import org.assertj.swing.edt.GuiActionRunner;
+import org.assertj.swing.edt.GuiQuery;
+import org.assertj.swing.fixture.FrameFixture;
+import org.assertj.swing.testng.SwingTestNGExamples;
+import org.testng.annotations.Test;
+
+public class SimpleFrame_GenericTypeMatcher_Test extends SwingTestNGExamples {
+  private FrameFixture window;
+
+  @Override
+  protected void onSetUp() {
+    SimpleFrame frame = GuiActionRunner.execute(new GuiQuery<SimpleFrame>() {
+      protected SimpleFrame executeInEDT() {
+        return new SimpleFrame();
+      }
+    });
+    window = new FrameFixture(robot(), frame);
+    window.show();
+  }
+
+  @Test
+  public void shoulFindOkButton() {
+    GenericTypeMatcher<JButton> textMatcher = new GenericTypeMatcher<JButton>(JButton.class) {
+      @Override
+      protected boolean isMatching(JButton button) {
+        return "OK".equals(button.getText());
+      }
+    };
+    window.button(textMatcher).requireVisible();
+  }
+}