- Added code for JUnit 5 article

junit5/src/test/java/com/baeldung/FirstTest.java

@@ -0,0 +1,27 @@
+package com.baeldung;
+
+import org.junit.gen5.api.Test;
+
+import static org.junit.gen5.api.Assertions.assertAll;
+import static org.junit.gen5.api.Assertions.assertEquals;
+import static org.junit.gen5.api.Assertions.assertTrue;
+
+class FirstTest {
+
+    @Test
+    void lambdaExpressions() {
+        String string = "";
+        assertTrue(() -> string.isEmpty(), "String should be empty");
+    }
+
+    @Test
+    void groupAssertions() {
+        int[] numbers = {0,1,2,3,4};
+        assertAll("numbers", () -> {
+            assertEquals(numbers[0], 1);
+            assertEquals(numbers[3], 3);
+            assertEquals(numbers[4], 1);
+        });
+    }
+
+}