diff --git a/src/test/java/com/github/strangelookingnerd/PedroProgressBarListenerTest.java b/src/test/java/com/github/strangelookingnerd/PedroProgressBarListenerTest.java
new file mode 100644
index 0000000..f1e64b8
--- /dev/null
+++ b/src/test/java/com/github/strangelookingnerd/PedroProgressBarListenerTest.java
@@ -0,0 +1,113 @@
+/*
+ * The MIT License
+ *
+ * Copyright (c) 2024 strangelookingnerd
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.github.strangelookingnerd;
+
+import com.intellij.ide.ui.laf.LafManagerImpl;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.wm.IdeFrame;
+import com.intellij.openapi.wm.StatusBar;
+import com.intellij.ui.BalloonLayout;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+
+import javax.swing.JComponent;
+import javax.swing.UIManager;
+import javax.swing.plaf.metal.MetalProgressBarUI;
+import java.awt.Rectangle;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+class PedroProgressBarListenerTest {
+
+    @Test
+    void testUpdateProgressBar() {
+        // defaults
+        assertEquals(MetalProgressBarUI.class.getName(), UIManager.get("ProgressBarUI"));
+        assertNull(UIManager.getDefaults().get(PedroProgressBarUI.class.getName()));
+
+        // ctor.
+        PedroProgressBarListener listener = new PedroProgressBarListener();
+        assertEquals(PedroProgressBarUI.class.getName(), UIManager.get("ProgressBarUI"));
+        assertEquals(PedroProgressBarUI.class, UIManager.getDefaults().get(PedroProgressBarUI.class.getName()));
+
+        // reset
+        UIManager.put("ProgressBarUI", null);
+        UIManager.getDefaults().remove(PedroProgressBarUI.class.getName());
+        assertEquals(MetalProgressBarUI.class.getName(), UIManager.get("ProgressBarUI"));
+        assertNull(UIManager.getDefaults().get(PedroProgressBarUI.class.getName()));
+
+        // applicationActivated
+        listener.applicationActivated(new TestFrame());
+        assertEquals(PedroProgressBarUI.class.getName(), UIManager.get("ProgressBarUI"));
+        assertEquals(PedroProgressBarUI.class, UIManager.getDefaults().get(PedroProgressBarUI.class.getName()));
+
+        // reset
+        UIManager.put("ProgressBarUI", null);
+        UIManager.getDefaults().remove(PedroProgressBarUI.class.getName());
+        assertEquals(MetalProgressBarUI.class.getName(), UIManager.get("ProgressBarUI"));
+        assertNull(UIManager.getDefaults().get(PedroProgressBarUI.class.getName()));
+
+        // lookAndFeelChanged
+        listener.lookAndFeelChanged(new LafManagerImpl());
+        assertEquals(PedroProgressBarUI.class.getName(), UIManager.get("ProgressBarUI"));
+        assertEquals(PedroProgressBarUI.class, UIManager.getDefaults().get(PedroProgressBarUI.class.getName()));
+    }
+
+    private static class TestFrame implements IdeFrame {
+
+        @Override
+        public @Nullable StatusBar getStatusBar() {
+            return null;
+        }
+
+        @Override
+        public @NotNull Rectangle suggestChildFrameBounds() {
+            return new Rectangle(0, 0, 100, 100);
+        }
+
+        @Override
+        public @Nullable Project getProject() {
+            return null;
+        }
+
+        @Override
+        public void setFrameTitle(String title) {
+            // NOP
+        }
+
+        @Override
+        public JComponent getComponent() {
+            return null;
+        }
+
+        @Override
+        public @Nullable BalloonLayout getBalloonLayout() {
+            return null;
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/test/java/com/github/strangelookingnerd/PedroProgressBarUITest.java b/src/test/java/com/github/strangelookingnerd/PedroProgressBarUITest.java
new file mode 100644
index 0000000..5cae417
--- /dev/null
+++ b/src/test/java/com/github/strangelookingnerd/PedroProgressBarUITest.java
@@ -0,0 +1,48 @@
+/*
+ * The MIT License
+ *
+ * Copyright (c) 2024 strangelookingnerd
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.github.strangelookingnerd;
+
+import org.junit.jupiter.api.Test;
+
+import javax.swing.plaf.ComponentUI;
+
+import static com.intellij.testFramework.UsefulTestCase.assertInstanceOf;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class PedroProgressBarUITest {
+
+    @Test
+    void testCreateUI() {
+        ComponentUI ui = PedroProgressBarUI.createUI(null);
+        assertInstanceOf(ui, PedroProgressBarUI.class);
+    }
+
+    @Test
+    void testGetBoxLength() {
+        PedroProgressBarUI progressBar = new PedroProgressBarUI();
+        assertEquals(0, progressBar.getBoxLength(0, 100));
+    }
+
+}
\ No newline at end of file