diff -r e825655c24a4 -r 4f8b9cee576b test/undir_graph_test.cc
--- a/test/undir_graph_test.cc	Mon Sep 12 09:15:59 2005 +0000
+++ b/test/undir_graph_test.cc	Mon Sep 12 09:19:52 2005 +0000
@@ -5,6 +5,7 @@
 #include <lemon/list_graph.h>
 #include <lemon/smart_graph.h>
 #include <lemon/full_graph.h>
+#include <lemon/grid_graph.h>
 
 #include <lemon/graph_utils.h>
 
@@ -43,12 +44,35 @@
   checkConcept<UndirGraph, UndirFullGraph>();
 
   checkConcept<UndirGraph, UndirGraph>();
+
+  checkConcept<UndirGraph, GridGraph>();
 }
 
 template <typename Graph>
 void check_item_counts(Graph &g, int n, int e) {
-  check(countNodes(g)==n, "Wrong node number.");
-  check(countEdges(g)==2*e, "Wrong edge number.");
+  int nn = 0;
+  for (typename Graph::NodeIt it(g); it != INVALID; ++it) {
+    ++nn;
+  }
+
+  check(nn == n, "Wrong node number.");
+  check(countNodes(g) == n, "Wrong node number.");
+
+  int ee = 0;
+  for (typename Graph::EdgeIt it(g); it != INVALID; ++it) {
+    ++ee;
+  }
+
+  check(ee == 2*e, "Wrong edge number.");
+  check(countEdges(g) == 2*e, "Wrong edge number.");
+
+  int uee = 0;
+  for (typename Graph::UndirEdgeIt it(g); it != INVALID; ++it) {
+    ++uee;
+  }
+
+  check(uee == e, "Wrong undir edge number.");
+  check(countUndirEdges(g) == e, "Wrong undir edge number.");
 }
 
 template <typename Graph>
@@ -108,8 +132,50 @@
   // print_items(g);
 
   check_item_counts(g,3,2);
+}
 
+void checkGridGraph(const GridGraph& g, int w, int h) {
+  check(g.width() == w, "Wrong width");
+  check(g.height() == h, "Wrong height");
 
+  for (int i = 0; i < w; ++i) {
+    for (int j = 0; j < h; ++j) {
+      check(g.col(g(i, j)) == i, "Wrong col");
+      check(g.row(g(i, j)) == j, "Wrong row");
+    }
+  }
+  
+  for (int i = 0; i < w; ++i) {
+    for (int j = 0; j < h - 1; ++j) {
+      check(g.source(g.down(g(i, j))) == g(i, j), "Wrong down");
+      check(g.target(g.down(g(i, j))) == g(i, j + 1), "Wrong down");
+    }
+    check(g.down(g(i, h - 1)) == INVALID, "Wrong down");
+  }
+
+  for (int i = 0; i < w; ++i) {
+    for (int j = 1; j < h; ++j) {
+      check(g.source(g.up(g(i, j))) == g(i, j), "Wrong up");
+      check(g.target(g.up(g(i, j))) == g(i, j - 1), "Wrong up");
+    }
+    check(g.up(g(i, 0)) == INVALID, "Wrong up");
+  }
+
+  for (int j = 0; j < h; ++j) {
+    for (int i = 0; i < w - 1; ++i) {
+      check(g.source(g.right(g(i, j))) == g(i, j), "Wrong right");
+      check(g.target(g.right(g(i, j))) == g(i + 1, j), "Wrong right");      
+    }
+    check(g.right(g(w - 1, j)) == INVALID, "Wrong right");    
+  }
+
+  for (int j = 0; j < h; ++j) {
+    for (int i = 1; i < w; ++i) {
+      check(g.source(g.left(g(i, j))) == g(i, j), "Wrong left");
+      check(g.target(g.left(g(i, j))) == g(i - 1, j), "Wrong left");      
+    }
+    check(g.left(g(0, j)) == INVALID, "Wrong left");    
+  }
 }
 
 int main() {
@@ -123,5 +189,13 @@
     check_item_counts(g, 5, 10);
   }
 
+  {
+    GridGraph g(5, 6);
+    check_item_counts(g, 30, 49);
+    checkGridGraph(g, 5, 6);
+  }
+
+  std::cout << __FILE__ ": All tests passed.\n";
+
   return 0;
 }