Resolve "OutputPlane"

Closes #793 (closed)

tests/opal_src/Elements/OpalOutputPlaneTest.cpp

@@ -15,7 +15,6 @@
 
 #include "gtest/gtest.h"
 
-#include "Physics/Units.h"
 #include "Attributes/Attributes.h"
 #include "AbsBeamline/Offset.h"
 #include "Elements/OpalOutputPlane.h"
@@ -64,7 +63,7 @@ TEST(OpalOutputPlaneTest, TestProbeMode) {
 TEST(OpalOutputPlaneTest, TestPlacement) {
     OpalOutputPlane plane;
     Attribute* att0 = plane.findAttribute("PLACEMENT_STYLE");
-    Attributes::setPredefinedString(*att0, "CENTRE-NORMAL");
+    Attributes::setPredefinedString(*att0, "CENTRE_NORMAL");
     Attribute* att1 = plane.findAttribute("CENTRE");
     Attributes::setRealArray(*att1, {1.0, 2.0, 3.0});
     Attribute* att2 = plane.findAttribute("NORMAL");