Migrate to JUnit5

marker/src/test/java/AppTest.java

@@ -20,7 +20,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-import org.junit.Test;
+
+import org.junit.jupiter.api.Test;
 
 /**
  * Application test

marker/src/test/java/GuardTest.java

@@ -20,10 +20,11 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-import org.junit.Test;
+
+import org.junit.jupiter.api.Test;
 
 import static org.hamcrest.CoreMatchers.instanceOf;
-import static org.junit.Assert.assertThat;
+import static org.hamcrest.MatcherAssert.assertThat;
 
 /**
  * Guard test

marker/src/test/java/ThiefTest.java

@@ -20,9 +20,10 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-import org.junit.Test;
 
-import static org.junit.Assert.assertFalse;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
 
 /**
  * Thief test