Add a simple test to demonstrate grid input.

Should be extended to test that the input is sane, too.

tests/Makefile.am

@@ -19,6 +19,7 @@ sparsevector_test				\
 test_cartgrid					\
 test_column_extract				\
 test_lapack					\
+test_read_grid					\
 test_read_vag					\
 test_readpolymer				\
 test_sf2p					\

tests/test_read_grid.c

@@ -0,0 +1,25 @@
+/*
+ * test_read_grid.c
+ *
+ *  Created on: Aug 28, 2012
+ *      Author: bska
+ */
+
+#include <stdio.h>
+
+#include <opm/core/grid.h>
+#include <opm/core/grid/cart_grid.h>
+
+int
+main(void)
+{
+    struct UnstructuredGrid *G1, *G2;
+
+    G1 = read_grid("cart_grid_2d.txt");
+    G2 = create_grid_cart2d(2, 2);
+
+    destroy_grid(G2);
+    destroy_grid(G1);
+
+    return 0;
+}