improve test coverage for the builder

src/main/java/org/zapodot/akka/junit/ActorSystemRuleBuilder.java

@@ -102,6 +102,14 @@ public ActorSystemRuleBuilder setConfigFromString(final String configString) {
         return setConfig(ConfigFactory.parseString(configString));
     }
 
+    Config currentConfig() {
+        if(this.config == null) {
+            return null;
+        } else {
+            return ConfigFactory.empty().withFallback(config);
+        }
+    }
+
     public ActorSystemRule build() {
 
         return config == null ? new ActorSystemRule(name) : new ActorSystemRule(name, config);

src/test/java/org/zapodot/akka/junit/ActorSystemRuleBuilderTest.java

@@ -0,0 +1,40 @@
+package org.zapodot.akka.junit;
+
+import akka.event.slf4j.Slf4jLogger;
+import akka.testkit.TestEventListener;
+import com.typesafe.config.Config;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class ActorSystemRuleBuilderTest {
+
+    @Test
+    public void testEnableEventListener() throws Exception {
+        final ActorSystemRuleBuilder actorSystemRuleBuilder = ActorSystemRule.builder().enableEventTestListener();
+        final Config config = actorSystemRuleBuilder.currentConfig();
+
+        assertEquals(TestEventListener.class.getName(), config.getStringList("akka.loggers").get(0));
+
+    }
+
+    @Test
+    public void testEnableEventLogging() throws Exception {
+        final ActorSystemRuleBuilder actorSystemRuleBuilder = ActorSystemRule.builder().enableEventLogging();
+        final Config config = actorSystemRuleBuilder.currentConfig();
+        assertEquals(Slf4jLogger.class.getName(), config.getStringList("akka.loggers").get(0));
+        assertEquals("DEBUG", config.getString("akka.loglevel"));
+    }
+
+    @Test
+    public void testEnableReceiveDebugLogging() throws Exception {
+        assertEquals("on", ActorSystemRule.builder().enableReceiveDebugLogging().currentConfig().getString(
+                "akka.actor.debug.receive"));
+    }
+
+    @Test
+    public void testEnableLifecycleDebugLogging() throws Exception {
+        assertEquals("on", ActorSystemRule.builder().enableLifecycleDebugLogging().currentConfig().getString("akka.actor.debug.lifecycle"));
+
+    }
+}