test all four Nothing/Just permutations for S.ap

sanctuary-js · Jan 21, 2017 · 8abab1c · 8abab1c
1 parent af0a7b8
commit 8abab1c
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/test/ap.js b/test/ap.js
@@ -16,6 +16,9 @@ test('ap', function() {
   eq(S.ap([S.inc], []), []);
   eq(S.ap([S.inc], [1, 2, 3]), [2, 3, 4]);
   eq(S.ap([S.dec, Math.sqrt], [1, 4, 9]), [0, 3, 8, 1, 2, 3]);
-  eq(S.ap(S.Just(S.inc), S.Just(42)), S.Just(43));
+  eq(S.ap(S.Nothing, S.Nothing), S.Nothing);
+  eq(S.ap(S.Nothing, S.Just(9)), S.Nothing);
+  eq(S.ap(S.Just(Math.sqrt), S.Nothing), S.Nothing);
+  eq(S.ap(S.Just(Math.sqrt), S.Just(9)), S.Just(3));
 
 });