diff --git a/test/environment/RuntimeEnvironmentTester.java b/test/environment/RuntimeEnvironmentTester.java
index fa87a7c..1dbbe1a 100644
--- a/test/environment/RuntimeEnvironmentTester.java
+++ b/test/environment/RuntimeEnvironmentTester.java
@@ -77,4 +77,39 @@ public class RuntimeEnvironmentTester {
         assertEquals(errorManager, environment.getErrorManager());
     }
 
+    @Test
+    public void assignOutputDecorator() {
+        environment.setOutputDecorator(s -> "[" + s + "]");
+
+        assertEquals("[test]", environment.decorateOutput("test"));
+    }
+
+    @Test
+    public void assignValueOutputDecorator() {
+        environment.setValueOutputDecorator(s -> "(" + s + ")");
+
+        assertEquals("(test)", environment.decorateValueOutput("test"));
+    }
+
+    @Test
+    public void assignWarningOutputDecorator() {
+        environment.setWarningOutputDecorator(s -> "|" + s + "|");
+
+        assertEquals("|test|", environment.decorateWarningOutput("test"));
+    }
+
+    @Test
+    public void assignErrorOutputDecorator() {
+        environment.setErrorOutputDecorator(s -> "{" + s + "}");
+
+        assertEquals("{test}", environment.decorateErrorOutput("test"));
+    }
+
+    @Test
+    public void assignCriticalOutputDecorator() {
+        environment.setCriticalOutputDecorator(s -> "/" + s + "/");
+
+        assertEquals("/test/", environment.decorateCriticalOutput("test"));
+    }
+
 }