chore(#2058): add tests and fix formatting

Author: SteKoe

spring-boot-admin-server/src/main/java/de/codecentric/boot/admin/server/domain/values/BuildVersion.java

@@ -32,9 +32,10 @@ public final class BuildVersion implements Serializable, Comparable<BuildVersion
 	private final String value;
 
 	private BuildVersion(String value) {
-		if(!StringUtils.hasText(value)) {
+		if (!StringUtils.hasText(value)) {
 			this.value = DEFAULT_VERSION;
-		} else {
+		}
+		else {
 			this.value = value;
 		}
 	}

spring-boot-admin-server/src/test/java/de/codecentric/boot/admin/server/domain/values/BuildVersionTest.java

@@ -26,6 +26,7 @@ public class BuildVersionTest {
 
 	@Test
 	public void should_return_version() {
+		assertThat(BuildVersion.valueOf(null).getValue()).isEqualTo("UNKNOWN");
 		assertThat(BuildVersion.from(emptyMap())).isNull();
 		assertThat(BuildVersion.from(singletonMap("version", "1.0.0"))).isEqualTo(BuildVersion.valueOf("1.0.0"));
 		assertThat(BuildVersion.from(singletonMap("build.version", "1.0.0"))).isEqualTo(BuildVersion.valueOf("1.0.0"));