Add uuid generator to RandomValuePropertySource

A well-formed string represenation of a UUID can now be generated
by ${random.uuid}.

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -410,13 +410,14 @@ or as a JNDI variable `java:comp/env/spring.application.json`.
 [[boot-features-external-config-random-values]]
 === Configuring random values
 The `RandomValuePropertySource` is useful for injecting random values (e.g. into secrets
-or test cases). It can produce integers, longs or strings, e.g.
+or test cases). It can produce integers, longs, uuids or strings, e.g.
 
 [source,properties,indent=0]
 ----
 	my.secret=${random.value}
 	my.number=${random.int}
 	my.bignumber=${random.long}
+	my.uuid=${random.uuid}
 	my.number.less.than.ten=${random.int(10)}
 	my.number.in.range=${random.int[1024,65536]}
 ----

spring-boot/src/main/java/org/springframework/boot/context/config/RandomValuePropertySource.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.context.config;
 
 import java.util.Random;
+import java.util.UUID;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -94,6 +95,9 @@ public class RandomValuePropertySource extends PropertySource<Random> {
 		if (range != null) {
 			return getNextLongInRange(range);
 		}
+		if (type.equals("uuid")) {
+			return UUID.randomUUID().toString();
+		}
 		return getRandomBytes();
 	}
 

spring-boot/src/test/java/org/springframework/boot/context/config/RandomValuePropertySourceTests.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.context.config;
 
 import java.util.Random;
+import java.util.UUID;
 
 import org.junit.Test;
 import org.mockito.Mockito;
@@ -49,6 +50,13 @@ public class RandomValuePropertySourceTests {
 		assertThat(value).isNotNull();
 	}
 
+	@Test
+	public void uuidValue() {
+		String value = (String) this.source.getProperty("random.uuid");
+		assertThat(value).isNotNull();
+		assertThat(UUID.fromString(value)).isNotNull();
+	}
+
 	@Test
 	public void intRange() {
 		Integer value = (Integer) this.source.getProperty("random.int[4,10]");