feat: add junit 5 support

build.gradle

@@ -11,7 +11,8 @@ repositories {
 }
 
 dependencies {
-    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testImplementation("org.junit.jupiter:junit-jupiter-api:5.7.0")
+    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.7.0")
 }
 
 javafx {
@@ -19,4 +20,8 @@ javafx {
     modules = [ 'javafx.controls', 'javafx.fxml' ]
 }
 
+test {
+    useJUnitPlatform()
+}
+
 mainClassName = 'fr.insa.clavardator.MainApp'

src/main/java/fr/insa/clavardator/TestClass.java

@@ -0,0 +1,7 @@
+package fr.insa.clavardator;
+
+public class TestClass {
+  public int test(int v) {
+    return v;
+  }
+}

src/test/java/FirstTest.java

@@ -0,0 +1,14 @@
+import fr.insa.clavardator.TestClass;
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+// See here: https://junit.org/junit5/docs/current/user-guide/#overview
+
+public class FirstTest {
+  private final TestClass t = new TestClass();
+
+  @Test
+  void addition() {
+    assertEquals(2, t.test(2));
+  }
+}