BAEL-5210 JUnit fail assertions use cases (#11314)

Co-authored-by: Andres Luzuriaga <aluzuriaga@proofpoint.com>

testing-modules/junit-5/src/test/java/com/baeldung/FailAssertionUnitTest.java

@@ -0,0 +1,50 @@
+package com.baeldung;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+import java.util.function.Supplier;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.fail;
+
+public class FailAssertionUnitTest {
+
+    @Test
+    void failThrowable() {
+        try {
+            safeMethod();
+            // more testing code
+        } catch (Exception e) {
+            fail(e);
+        }
+    }
+
+    @Test
+    void failMessageThrowable() {
+        try {
+            safeMethod();
+            // more testing code
+        } catch (Exception e) {
+            fail("Unexpected exception was thrown", e);
+        }
+    }
+
+    @Test
+    @Disabled
+    void failMessageSupplier() {
+        Supplier<String> timedMessage = () -> DateTimeFormatter.ofPattern("yyyy-MM-dd").format(LocalDate.now());
+        fail(timedMessage);
+    }
+
+    @Test
+    void genericType() {
+        Stream.of().map(entry -> fail("should not be called"));
+    }
+
+    private void safeMethod() {
+        return;
+    }
+}