diff --git a/tests/src_invalid/message.msg b/tests/src_invalid/message.msg
deleted file mode 100644
index 93a1885..0000000
--- a/tests/src_invalid/message.msg
+++ /dev/null
@@ -1,20 +0,0 @@
-From: John Doe <example@example.com>
-MIME-Version: 1.0
-Content-Type: multipart/mixed;
-        boundary="XXXXboundary text"
-
-This is a multipart message in MIME format.
-
---XXXXboundary text
-Content-Type: text/plain
-
-this is the body text
-
---XXXXboundary text
-Content-Type: text/plain;
-Content-Disposition: attachment;
-        filename="test.txt"
-
-this is the attachment text
-
---XXXXboundary text--
diff --git a/tests/src_invalid/ntree.wrl b/tests/src_invalid/ntree.wrl
deleted file mode 100644
index d8560b8..0000000
--- a/tests/src_invalid/ntree.wrl
+++ /dev/null
@@ -1,181 +0,0 @@
-#VRML V1.0 ascii
-
-DEF Ez3d_Scene Separator {
-    DEF Ez3d_Viewer Switch {
-	whichChild	-3
-	DEF Title Info {
-	    string	""
-	}
-	DEF Viewer Info {
-	    string	"walk"
-	}
-	DEF BackgroundColor Info {
-	    string	"0.000000 0.000000 0.000000"
-	}
-	DEF Cameras Switch {
-	    whichChild	0
-	    PerspectiveCamera {
-		position	1.12948 2.23403 9.88775
-		orientation	0.192413 -0.894646 -0.403219  6.1811
-		focalDistance	9.51932
-		heightAngle	0.683577
-	    }
-	}
-    }
-    DEF Ez3d_Environment Switch {
-	whichChild	-3
-    }
-    DEF Ez3d_Objects Switch {
-	whichChild	-3
-	DEF Cube001 Separator {
-	    Transform {
-		scaleFactor	1.76681 0.168973 1.76681
-	    }
-	    Texture2 {
-		filename	"brick.gif"
-		wrapS	REPEAT
-		wrapT	REPEAT
-	    }
-	    DEF Ez3d_Material Material {
-		ambientColor	0.0375 0.0375 0.0375
-		diffuseColor	0.425 0.425 0.425
-		specularColor	0.807547 0.807547 0.807547
-		shininess	0.5
-		transparency	0
-	    }
-	    ShapeHints {
-		vertexOrdering	COUNTERCLOCKWISE
-		shapeType	UNKNOWN_SHAPE_TYPE
-		creaseAngle	0.523599
-	    }
-	    DEF Ez3d_Cube001 Cube {
-	    }
-	}
-	DEF Cylinder001 Separator {
-	    Transform {
-		translation	0.0806677 1.11004 4.76837e-007
-		scaleFactor	0.176417 0.977561 0.156127
-		center	-5.52615e-009 4.58545e-008 0
-	    }
-	    Texture2 {
-		filename	"oak.gif"
-		wrapS	REPEAT
-		wrapT	REPEAT
-	    }
-	    ShapeHints {
-		vertexOrdering	COUNTERCLOCKWISE
-		shapeType	UNKNOWN_SHAPE_TYPE
-		creaseAngle	0.523599
-	    }
-	    DEF Ez3d_Cylinder001 Cylinder {
-	    }
-	}
-	DEF Group002 Separator {
-	    Transform {
-		translation	0.0497642 2.50354 -0.281726
-		center	0.174201 0.111916 0.106615
-	    }
-	    DEF Sphere001_2 Separator {
-		Transform {
-		    translation	-0.0497642 -0.0265024 -0.479769
-		}
-		DEF Ez3d_Material Material {
-		    ambientColor	0.0908158 0.776699 0.00823493
-		    diffuseColor	0.0935403 0.8 0.00848198
-		    specularColor	0.114655 0.980583 0.0103966
-		    shininess	0.184466
-		    transparency	0.485437
-		}
-		ShapeHints {
-		    vertexOrdering	COUNTERCLOCKWISE
-		    shapeType	UNKNOWN_SHAPE_TYPE
-		    creaseAngle	0.523599
-		}
-		DEF Ez3d_Sphere001_2 Sphere {
-		}
-	    }
-	    DEF Sphere001 Separator {
-		Transform {
-		    translation	-0.0497642 -0.178993 0.25727
-		}
-		DEF Ez3d_Material Material {
-		    ambientColor	0.0908158 0.776699 0.00823493
-		    diffuseColor	0.0935403 0.8 0.00848198
-		    specularColor	0.114655 0.980583 0.0103966
-		    shininess	0.184466
-		    transparency	0.485437
-		}
-		ShapeHints {
-		    vertexOrdering	COUNTERCLOCKWISE
-		    shapeType	UNKNOWN_SHAPE_TYPE
-		    creaseAngle	0.523599
-		}
-		DEF Ez3d_Sphere001 Sphere {
-		}
-	    }
-	    DEF Group001 Separator {
-		Transform {
-		    translation	0.0995283 0.205495 0.222499
-		    center	0.0746732 -0.077734 -0.115884
-		}
-		DEF Sphere001_4 Separator {
-		    Transform {
-			translation	0.557986 0.19733 0.231768
-		    }
-		    DEF Ez3d_Material Material {
-			ambientColor	0.0908158 0.776699 0.00823493
-			diffuseColor	0.0935403 0.8 0.00848198
-			specularColor	0.114655 0.980583 0.0103966
-			shininess	0.184466
-			transparency	0.485437
-		    }
-		    ShapeHints {
-			vertexOrdering	COUNTERCLOCKWISE
-			shapeType	UNKNOWN_SHAPE_TYPE
-			creaseAngle	0.523599
-		    }
-		    DEF Ez3d_Sphere001_4 Sphere {
-		    }
-		}
-		DEF Sphere001_1 Separator {
-		    Transform {
-			translation	-0.149346 -0.352797 0.470501
-		    }
-		    DEF Ez3d_Material Material {
-			ambientColor	0.0908158 0.776699 0.00823493
-			diffuseColor	0.0935403 0.8 0.00848198
-			specularColor	0.114655 0.980583 0.0103966
-			shininess	0.184466
-			transparency	0.485437
-		    }
-		    ShapeHints {
-			vertexOrdering	COUNTERCLOCKWISE
-			shapeType	UNKNOWN_SHAPE_TYPE
-			creaseAngle	0.523599
-		    }
-		    DEF Ez3d_Sphere001_1 Sphere {
-		    }
-		}
-		DEF Sphere001_3 Separator {
-		    Transform {
-			translation	-0.40864 0.155468 -0.702269
-		    }
-		    DEF Ez3d_Material Material {
-			ambientColor	0.0908158 0.776699 0.00823493
-			diffuseColor	0.0935403 0.8 0.00848198
-			specularColor	0.114655 0.980583 0.0103966
-			shininess	0.184466
-			transparency	0.485437
-		    }
-		    ShapeHints {
-			vertexOrdering	COUNTERCLOCKWISE
-			shapeType	UNKNOWN_SHAPE_TYPE
-			creaseAngle	0.523599
-		    }
-		    DEF Ez3d_Sphere001_3 Sphere {
-		    }
-		}
-	    }
-	}
-    }
-}