scalar FieldVectors should behave as scalars, thus, add a test for

comparison operators.

[[Imported from SVN: r6169]]

dune/common/test/fvectortest.cc

@@ -84,7 +84,9 @@ public:
     a = v;
 
     b = (v == a);
+    b = (v != a);
     b = (a == v);
+    b = (a != v);
 
     a = v + a;
     a = v - a;
@@ -112,6 +114,21 @@ public:
     v += a;
     v *= a;
     v /= a;
+
+    b = (v<a);
+    b = (v<=a);
+    b = (v>=a);
+    b = (v>a);
+
+    b = (v<w);
+    b = (v<=w);
+    b = (v>=w);
+    b = (v>w);
+
+    b = (a<w);
+    b = (a<=w);
+    b = (a>=w);
+    b = (a>w);
   }
 };