Enable slf4j logging in storage unit tests

scm-persistence/build.gradle

@@ -35,4 +35,5 @@ dependencies {
   testCompileOnly libraries.lombok
   annotationProcessor libraries.lombok
   testAnnotationProcessor libraries.lombok
+  testRuntimeOnly libraries.logback
 }

scm-persistence/src/test/resources/logback.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+    Copyright (c) 2020 - present Cloudogu GmbH
+
+    This program is free software: you can redistribute it and/or modify it under
+    the terms of the GNU Affero General Public License as published by the Free
+    Software Foundation, version 3.
+
+    This program is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+    details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program. If not, see https://www.gnu.org/licenses/.
+-->
+
+<!--
+    Document   : logback.xml
+    Created on : January 18, 2011, 5:46 PM
+    Author     : sdorra
+    Description:
+        Purpose of the document follows.
+-->
+
+<configuration>
+
+  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+    <!-- encoders are  by default assigned the type
+         ch.qos.logback.classic.encoder.PatternLayoutEncoder -->
+    <encoder>
+      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
+    </encoder>
+  </appender>
+
+  <logger name="sonia.scm.store" level="TRACE" />
+
+  <root level="INFO">
+    <appender-ref ref="STDOUT" />
+  </root>
+
+</configuration>