diff --git a/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/utils/ConfigUtils.scala b/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/utils/ConfigUtils.scala
index 106ef2b6e3ee155f22ee8009e26e866455f796e6..47e7d1af8d21add7744613806ea7520d82cbf04d 100644
--- a/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/utils/ConfigUtils.scala
+++ b/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/utils/ConfigUtils.scala
@@ -331,7 +331,6 @@ object ConfigUtils extends Logging {
   trait ImplicitConversions {
     import scala.language.implicitConversions
 
-    //TODO: unit test on message
     private def requiredValue(value: ConfigValue): Boolean = {
       val exist = valueExists(value)
       if (!exist)
diff --git a/public/biopet-framework/src/test/scala/nl/lumc/sasc/biopet/utils/ConfigUtilsTest.scala b/public/biopet-framework/src/test/scala/nl/lumc/sasc/biopet/utils/ConfigUtilsTest.scala
index 26f989c5369c4e138ded82620d1d03f0c076ce7c..ddcf887d819eb0edc09bfc5b6a42954115e62192 100644
--- a/public/biopet-framework/src/test/scala/nl/lumc/sasc/biopet/utils/ConfigUtilsTest.scala
+++ b/public/biopet-framework/src/test/scala/nl/lumc/sasc/biopet/utils/ConfigUtilsTest.scala
@@ -4,6 +4,7 @@ import java.io.{ PrintWriter, File }
 
 import argonaut.Argonaut._
 import argonaut.Json
+import nl.lumc.sasc.biopet.core.BiopetQScript
 import nl.lumc.sasc.biopet.core.config.{ ConfigValueIndex, ConfigValue }
 import org.scalatest.Matchers
 import org.scalatest.mock.MockitoSugar
@@ -170,79 +171,23 @@ class ConfigUtilsTest extends TestNGSuite with Matchers {
     val index = ConfigValueIndex("test", Nil, "test")
     new ImplicitConversions {
       configValue2list(ConfigValue(index, index, List(""))) shouldBe List("")
-      intercept[IllegalStateException] {
-        configValue2list(ConfigValue(index, index, null))
-      }
-
       configValue2stringList(ConfigValue(index, index, List(""))) shouldBe List("")
-      intercept[IllegalStateException] {
-        configValue2stringList(ConfigValue(index, index, null))
-      }
-
       configValue2stringSet(ConfigValue(index, index, List(""))) shouldBe Set("")
-      intercept[IllegalStateException] {
-        configValue2stringSet(ConfigValue(index, index, null))
-      }
 
       var int: Int = ConfigValue(index, index, 1)
-      intercept[IllegalStateException] {
-        int = ConfigValue(index, index, null)
-      }
-
       var long: Long = ConfigValue(index, index, 1)
-      intercept[IllegalStateException] {
-        long = ConfigValue(index, index, null)
-      }
-
       var double: Double = ConfigValue(index, index, 1)
-      intercept[IllegalStateException] {
-        double = ConfigValue(index, index, null)
-      }
-
       var float: Float = ConfigValue(index, index, 1)
-      intercept[IllegalStateException] {
-        float = ConfigValue(index, index, null)
-      }
-
       var boolean: Boolean = ConfigValue(index, index, true)
-      intercept[IllegalStateException] {
-        boolean = ConfigValue(index, index, null)
-      }
-
       var intOption: Option[Int] = ConfigValue(index, index, 1)
-      intercept[IllegalStateException] {
-        int = ConfigValue(index, index, null)
-      }
-
       var longOption: Option[Long] = ConfigValue(index, index, 1)
-      intercept[IllegalStateException] {
-        long = ConfigValue(index, index, null)
-      }
-
       var doubleOption: Option[Double] = ConfigValue(index, index, 1)
-      intercept[IllegalStateException] {
-        double = ConfigValue(index, index, null)
-      }
-
       var floatOption: Option[Float] = ConfigValue(index, index, 1)
-      intercept[IllegalStateException] {
-        float = ConfigValue(index, index, null)
-      }
-
       var booleanOption: Option[Boolean] = ConfigValue(index, index, true)
-      intercept[IllegalStateException] {
-        boolean = ConfigValue(index, index, null)
-      }
-
       var string: String = ConfigValue(index, index, "test")
-      intercept[IllegalStateException] {
-        string = ConfigValue(index, index, null)
-      }
-
       var file: File = ConfigValue(index, index, "test")
-      intercept[IllegalStateException] {
-        file = ConfigValue(index, index, null)
-      }
+
+      //TODO: test BiopetQScript error message
     }
   }
 }