diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
new file mode 100644
index 0000000..d124634
--- /dev/null
+++ b/.github/workflows/gradle.yml
@@ -0,0 +1,16 @@
+name: Java CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-java@v2
+      with:
+        distribution: 'temurin'
+        java-version: 19
+    - run: ./mvnw clean test
diff --git a/pom.xml b/pom.xml
index 36ed409..bd441a4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,6 +22,13 @@
       <version>${jbock.version}</version>
     </dependency>
 
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <version>5.9.1</version>
+      <scope>test</scope>
+    </dependency>
+
   </dependencies>
 
   <repositories>
@@ -73,6 +80,11 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>3.2.2</version>
+      </plugin>
     </plugins>
   </build>
 </project>
diff --git a/src/main/java/net/jbock/cp/Args.java b/src/main/java/net/jbock/cp/Args.java
index 50abbc4..53fd464 100644
--- a/src/main/java/net/jbock/cp/Args.java
+++ b/src/main/java/net/jbock/cp/Args.java
@@ -4,47 +4,44 @@
 import net.jbock.Option;
 import net.jbock.Parameter;
 
-import java.lang.reflect.Method;
-import java.lang.reflect.Modifier;
 import java.nio.file.Path;
 import java.util.Optional;
-import java.util.StringJoiner;
 
 /**
  * Copy SOURCE to DEST
  */
 @Command(name = "cp")
-abstract class Args {
+interface Args {
 
     /**
      * Path or file of directory to copy.
      * @return SOURCE
      */
     @Parameter(index = 0)
-    abstract Path source();
+    Path source();
 
     /**
      * Copy destination
      * @return DEST
      */
     @Parameter(index = 1)
-    abstract Path dest();
+    Path dest();
 
     /**
      * Copy directories recursively
      */
     @Option(names = {"--recursive", "-r"})
-    abstract boolean recursive();
+    boolean recursive();
 
     /**
      * Make a backup of each existing destination file
      */
     @Option(names = {"--backup", "-b"})
-    abstract boolean backup();
+    boolean backup();
 
     /**
      * Override the usual backup suffix
      */
     @Option(names = {"--suffix", "-s"})
-    abstract Optional<String> suffix();
+    Optional<String> suffix();
 }
diff --git a/src/test/java/net/jbock/cp/ArgsTest.java b/src/test/java/net/jbock/cp/ArgsTest.java
new file mode 100644
index 0000000..4939181
--- /dev/null
+++ b/src/test/java/net/jbock/cp/ArgsTest.java
@@ -0,0 +1,16 @@
+package net.jbock.cp;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class ArgsTest {
+
+    @Test
+    void testPrint() {
+        Args result = new ArgsParser().parse(List.of("1", "2", "-rbs12")).getRight().orElseThrow();
+        assertEquals("{recursive: true, backup: true, suffix: Optional[12], source: 1, dest: 2}", result.toString());
+    }
+}