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%% ---------------------------------------------------------------------
%% Licensed under the Apache License, Version 2.0 (the "License"); you may
%% not use this file except in compliance with the License. You may obtain
%% a copy of the License at <http://www.apache.org/licenses/LICENSE-2.0>
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% @author Richard Carlsson <[email protected]>
%% @copyright 2012 Richard Carlsson
%% @doc Tests. For including in another module.
%-module(lisp_test).
%-import(lisp, eval/1)
-export([fib/1, lisp_fib/1]).
-include_lib("eunit/include/eunit.hrl").
basics_test_() ->
[?_assertEqual(42, eval(42)),
?_assertEqual("hello", eval([quote, "hello"])),
?_assertEqual(print, eval([quote, print])),
?_assertMatch([17,[1,2],42], eval([list,17,[list,1,2],42])),
?_assertEqual([], eval([print, [quote, "hello ~w"], [list, 42]])),
?_assertEqual(5, eval([plus, 2, 3])),
?_assertEqual(5, eval([plus, 8, -3])),
?_assertEqual([], eval([equal, 0, 1])),
?_assertEqual(1, eval([equal, 1, 1])),
?_assertEqual([], eval([gt, 0, 1])),
?_assertEqual([], eval([gt, 1, 1])),
?_assertEqual(1, eval([gt, 2, 1])),
?_assertEqual([], eval([knot, 42])),
?_assertEqual(1, eval([knot, []])),
?_assertEqual(42, eval([do, 17, 42])),
?_assertEqual([], eval([apply, print, [quote, ["~p", [42]]]])),
?_assertEqual(42, eval([iff, [], 17, 42])),
?_assertEqual(17, eval([iff, 1, 17, 42])),
?_assertEqual(42, eval([iff, [], [apply], 42])),
?_assertEqual(17, eval([iff, 1, 17, [apply]])),
?_assertEqual(17, eval([def, foo, 17, foo])),
?_assertEqual(17, eval([def, bar, 42, [def, foo, 17, foo]])),
?_assertEqual(42, eval([def, bar, 42, [def, foo, 17, bar]])),
?_assertEqual(17, eval([def, foo, 42, [def, foo, 17, foo]]))
].
-ifdef(INTERPRETED).
interpreter_basics_test_() ->
[?_assertThrow({undefined, foo}, eval(foo)),
?_assertMatch({builtin,_}, eval(print)),
?_assertThrow(bad_do, eval([do])),
?_assertThrow(bad_apply, eval([apply])),
?_assertThrow({undefined, foo}, eval([def, bar, 17, foo]))
].
interpreter_lambda_test_() ->
[?_assertMatch({lambda,_,_,_}, eval([lambda, [], 42])),
?_assertMatch({lambda,_,_,_}, eval([lambda, [x], x])),
?_assertMatch({lambda,_,_,_}, eval([lambda, [x,y], 42]))
].
-endif.
lambda_test_() ->
[?_assertThrow(bad_lambda, eval([lambda])),
?_assertThrow(bad_lambda, eval([lambda, []])),
?_assertThrow(bad_lambda, eval([lambda, [], 17, 42])),
?_assertThrow(bad_lambda, eval([lambda, 17, 42])),
?_assertThrow(bad_lambda, eval([lambda, [17], 42])),
?_assertThrow(bad_lambda, eval([lambda, [foo, foo], 42])),
?_assertEqual(42, eval([[lambda, [x], x], 42])),
?_assertEqual([42, 17], eval([[lambda, [x], [list, x, 17]], 42])),
?_assertEqual([42, 17], eval([def, f, [def, y, 42,
[lambda, [x], [list, y, x]]],
[f, 17]]))
].
fib_test_() ->
[?_assertEqual(fib(N), lisp_fib(N)) || N <- lists:seq(1,15)
].
fib(N) when N > 1 ->
fib(N-1) + fib(N-2);
fib(_) ->
1.
lisp_fib(N) ->
eval([def, fib,
[y, [lambda, [f], [lambda, [x],
[iff, [gt, x, 1],
[plus, [f, [plus,x,-1]], [f, [plus,x,-2]]],
1]
]]],
[fib, N]
]).
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