Remove old test version, reference canonical data

exercises/list-ops/README.md

@@ -22,25 +22,6 @@ directory.
 $ rebar3 eunit
 ```
 
-### Test versioning
-
-Each problem defines a macro `TEST_VERSION` in the test file and
-verifies that the solution defines and exports a function `test_version`
-returning that same value.
-
-To make tests pass, add the following to your solution:
-
-```erlang
--export([test_version/0]).
-
-test_version() ->
-  1.
-```
-
-The benefit of this is that reviewers can see against which test version
-an iteration was written if, for example, a previously posted solution
-does not solve the current problem or passes current tests.
-
 ## Questions?
 
 For detailed information about the Erlang track, please refer to the

exercises/list-ops/src/example.erl

@@ -1,10 +1,7 @@
 -module(example).
 
 -export([append/2, concat/1, filter/2, length/1, map/2, foldl/3, foldr/3,
-	 reverse/1, test_version/0]).
-
-test_version() ->
-    1.
+	 reverse/1]).
 
 append(L1, L2) -> L1 ++ L2.
 

exercises/list-ops/src/list_ops.erl

@@ -1,7 +1,7 @@
 -module(list_ops).
 
 -export([append/2, concat/1, filter/2, length/1, map/2, foldl/3, foldr/3,
-	 reverse/1, test_version/0]).
+	 reverse/1]).
 
 append(_List1, _List2) -> undefined.
 
@@ -18,5 +18,3 @@ foldl(_Function, _Start, _List) -> undefined.
 foldr(_Function, _Start, _List) -> undefined.
 
 reverse(_List) -> undefined.
-
-test_version() -> 1.

exercises/list-ops/test/list_ops_tests.erl

@@ -1,3 +1,6 @@
+%% based on canonical data version 2.3.0
+%% https://raw.githubusercontent.com/exercism/problem-specifications/master/exercises/list-ops/canonical-data.json
+
 -module(list_ops_tests).
 
 -include_lib("erl_exercism/include/exercism.hrl").
@@ -82,5 +85,3 @@ reverse_empty_list_test() ->
 reverse_non_empty_list_test() ->
 	?assertEqual([7,5,3,1],
 		     list_ops:reverse([1,3,5,7])).
-
-version_test() -> ?assertMatch(1, list_ops:test_version()).