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commit f289e798d29e4f686f602cf45bb465dfed8d0205
Author: Eric Cooper <e...@cmu.edu>
Date:   Fri Jun 19 22:55:10 2015 -0400

    relax check for Invalid_argument exception
    
    In OCaml 4.02, String.sub raises Invalid_argument("String.sub / Bytes.sub")
    Rather than check for it exactly using assert_raises,
    only check that the constructor is Invalid_argument.
---
 tests/testlib.ml   | 12 ++++++++++++
 tests/util_test.ml | 14 +++++++-------
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/tests/testlib.ml b/tests/testlib.ml
index 0649f3e..6e0fc07 100644
--- a/tests/testlib.ml
+++ b/tests/testlib.ml
@@ -2,6 +2,7 @@
    Copyright (C) 2015  Eric C. Cooper <e...@cmu.edu>
    Released under the GNU General Public License *)
 
+open OUnit
 open Printf
 
 let p_bool = sprintf "%b"
@@ -16,3 +17,14 @@ let p_opt pf = function | Some x -> pf x | None -> "-"
 let p_exn = Printexc.to_string
 
 let tear_down _ _ = ()
+
+let assert_invalid ?msg f =
+  let result =
+    try f (); None
+    with e -> Some e
+  in
+  match result with
+  | None ->
+      assert_failure "expected Invalid_argument exception, but no exception 
was raised."
+  | Some (Invalid_argument _) -> ()
+  | Some e -> assert_failure ("expected Invalid_argument exception, but " ^ 
p_exn e ^ " was raised.")
diff --git a/tests/util_test.ml b/tests/util_test.ml
index 363c802..d5623a3 100644
--- a/tests/util_test.ml
+++ b/tests/util_test.ml
@@ -73,15 +73,15 @@ let suite = [
      Some 6, None,   "abcdef", "";
      Some 6, Some 6, "abcdef", ""]
   @
-  map (fun (from, until, str, e) ->
+  map (fun (from, until, str) ->
     sprintf "(substring %s %s %s)"
       (p_opt p_int from) (p_opt p_int until) (p_str str) >::
-    (fun _ -> assert_raises e (fun () -> Util.substring ?from ?until str)))
-    [None,   Some 7, "abcdef", Invalid_argument "String.sub";
-     Some 0, Some 7, "abcdef", Invalid_argument "String.sub";
-     Some 1, None,   "",       Invalid_argument "String.sub";
-     Some 7, None,   "abcdef", Invalid_argument "String.sub";
-     Some 4, Some 3, "abcdef", Invalid_argument "String.sub"];
+    (fun _ -> assert_invalid (fun () -> Util.substring ?from ?until str)))
+    [None,   Some 7, "abcdef";
+     Some 0, Some 7, "abcdef";
+     Some 1, None,   "";
+     Some 7, None,   "abcdef";
+     Some 4, Some 3, "abcdef"];
 
   "split_tests" >:::
   map (fun (c, str, res) ->

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