From d5ad2e0ed8cb0e028142dab5ff41d32afc8397cc Mon Sep 17 00:00:00 2001
From: AndreiMandris <andu_atm@yahoo.com>
Date: Fri, 23 Sep 2022 19:44:52 +0300
Subject: [PATCH] BAEL-5692 Validate UUID String in Java (#12635)

* BAEL-5692 Validate UUID String in Java

* cleaned up the Main method

* added unit test for uuid validation

* renamed unit test method name

* formatted unit test

* removed unneeded file

* replaced gradle by maven

* removed gradle project

* moved project

* added readme file

* segregated unit tests by validator type.

* inlined the validating logic inside the unit tests

* moved the UUIDValidatorTest.java to core-java-uuid module

* renamed test

Co-authored-by: andrei-mandris <andrei.mandris.ext@deliveryhero.com>
---
 .../baeldung/uuid/UUIDValidatorUnitTest.java  | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDValidatorUnitTest.java

diff --git a/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDValidatorUnitTest.java b/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDValidatorUnitTest.java
new file mode 100644
index 0000000000..76ed644dd7
--- /dev/null
+++ b/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDValidatorUnitTest.java
@@ -0,0 +1,29 @@
+package com.baeldung.uuid;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.UUID;
+import java.util.regex.Pattern;
+
+public class UUIDValidatorUnitTest {
+
+  @Test
+  public void whenValidUUIDStringIsValidated_thenValidationSucceeds() {
+    String validUUID = "26929514-237c-11ed-861d-0242ac120002";
+    Assertions.assertEquals(UUID.fromString(validUUID).toString(), validUUID);
+
+    String invalidUUID = "invalid-uuid";
+    Assertions.assertThrows(IllegalArgumentException.class, () -> UUID.fromString(invalidUUID));
+  }
+
+  @Test
+  public void whenUUIDIsValidatedUsingRegex_thenValidationSucceeds() {
+    Pattern UUID_REGEX =
+        Pattern.compile("^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$");
+
+    Assertions.assertTrue(UUID_REGEX.matcher("26929514-237c-11ed-861d-0242ac120002").matches());
+
+    Assertions.assertFalse(UUID_REGEX.matcher("invalid-uuid").matches());
+  }
+}