test_component not using Random anymore

tests/dune

@@ -220,22 +220,22 @@
 
 ;; Rules for the test_components test
 
-;; (rule
-;;  (with-stdout-to
-;;   test_components.output
-;;   (run ./test_components.exe)))
-
-;; (rule
-;;  (alias runtest)
-;;  (action
-;;   (progn
-;;    (diff test_components.expected test_components.output)
-;;    (echo "test_components: all tests succeeded.\n"))))
-
-;; (executable
-;;  (name test_components)
-;;  (modules test_components)
-;;  (libraries graph))
+(rule
+ (with-stdout-to
+  test_components.output
+  (run ./test_components.exe)))
+
+(rule
+ (alias runtest)
+ (action
+  (progn
+   (diff test_components.expected test_components.output)
+   (echo "test_components: all tests succeeded.\n"))))
+
+(executable
+ (name test_components)
+ (modules test_components)
+ (libraries graph))
 
 ;; rules for the dot test
 

tests/test_components.expected

@@ -1,11 +1,9 @@
-7 components
+4 components
 0 -> 0
 1 -> 1
-2 -> 2
-3 -> 3
-4 -> 1
-5 -> 1
-6 -> 4
-7 -> 1
-8 -> 5
-9 -> 6
+2 -> 0
+3 -> 2
+4 -> 2
+5 -> 3
+6 -> 2
+7 -> 0

tests/test_components.ml

@@ -22,19 +22,20 @@ module C = Components.Undirected(Pack.Graph)
 
 open Pack.Graph
 
-(* FIXME: do not use Random here, as OCaml 5.0 seems to generate a
-   different graph *)
+(*         0 -- 2 -- 7   1   3 -- 4   5
+                             \  /
+                               6
+
+component:      0        1     2      3
+*)
 
 let () =
-  Random.init 42;
-  let g = Rand.graph ~v:10 ~e:3 () in
+  let g = create () in
+  let v = Array.init 8 V.create in
+  Array.iter (add_vertex g) v;
+  let add i j = add_edge g v.(i) v.(j) in
+  add 0 2; add 7 2; add 3 4; add 4 6; add 3 6;
   let n, f = C.components g in
   printf "%d components@." n;
   iter_vertex (fun v -> printf "%d -> %d@." (V.label v) (f v)) g
 
-
-(*
-Local Variables:
-compile-command: "ocaml -I .. graph.cma test_components.ml"
-End:
-*)