[test] Test assignment of MultiTypeBlockVector from scalar

dune/istl/test/multitypeblockvectortest.cc

@@ -60,6 +60,11 @@ int main(int argc, char** argv) try
   multiVector2 *= (int)2;
   multiVector2 *= (float)0.5;
 
+  // Test assignment from scalar
+  multiVector2 = (double)0.5;
+  multiVector2 = (int)2;
+  multiVector2 = (float)0.5;
+
   // Test axpy
   multiVector2.axpy(-1, multiVector);
 
@@ -93,4 +98,4 @@ catch (std::exception& e)
 {
   std::cerr << "Unknown exception encountered!" << std::endl;
   return 3;
-}
\ No newline at end of file
+}