expand unit-tests and fix const-qualifaction bugs thus discovered
diff --git a/test/adjoint.cpp b/test/adjoint.cpp
index 1d98d6a..7a33f8b 100644
--- a/test/adjoint.cpp
+++ b/test/adjoint.cpp
@@ -87,6 +87,13 @@
   
   // check compatibility of dot and adjoint
   VERIFY_IS_APPROX(v1.dot(square * v2),              (square.adjoint() * v1).dot(v2));
+  
+  // like in testBasicStuff, test operator() to check const-qualification
+  int r = random<int>(0, rows-1),
+      c = random<int>(0, cols-1);
+  VERIFY_IS_APPROX(m1.conjugate()(r,c), conj(m1(r,c)));
+  VERIFY_IS_APPROX(m1.adjoint()(c,r), conj(m1(r,c)));
+  
 }
 
 void EigenTest::testAdjoint()