Configure test logging (#14)

build.sbt

@@ -14,6 +14,7 @@ lazy val root = (project in file("."))
       s"-Dpidfile.path=/dev/null",
       s"-J-Dlogs.home=/var/log/${packageName.value}",
     ),
+    Test / javaOptions += "-Dlogback.configurationFile=logback-test.xml",
     libraryDependencies ++= Seq(
       "net.logstash.logback" % "logstash-logback-encoder" % "7.4",
       ("com.gu" %% "simple-configuration-ssm" % "1.6.4").cross(CrossVersion.for3Use2_13),

test/resources/logback-test.xml

@@ -0,0 +1,16 @@
+<!-- https://www.playframework.com/documentation/latest/SettingsLogger -->
+<configuration>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
+            <charset>UTF-8</charset>
+            <pattern>%d{yyyy-MM-dd HH:mm:ss} %highlight(%-5level) %cyan(%logger{36}) %magenta(%X{pekkoSource}) %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="ERROR">
+        <appender-ref ref="STDOUT"/>
+    </root>
+
+</configuration>