OZG-4717 add TestFactory for Root

src/test/java/de/ozgcloud/admin/RootTestFactory.java

+package de.ozgcloud.admin;
+
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+
+public class RootTestFactory {
+
+	public static final Instant BUILD_TIME = LocalDateTime.parse("2021-04-01T10:30").toInstant(ZoneOffset.UTC);
+	public static final String JAVA_VERSION = "1";
+	public static final String BUILD_VERSION = "2";
+	public static final String BUILD_NUMBER = "3";
+
+	public static Root create() {
+		return createBuilder().build();
+	}
+
+	public static Root.RootBuilder createBuilder() {
+		return Root.builder()
+				.buildTime(BUILD_TIME)
+				.buildVersion(BUILD_NUMBER)
+				.buildNumber(BUILD_NUMBER)
+				.javaVersion(JAVA_VERSION);
+	}
+}