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Update strain tests #596

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52 changes: 52 additions & 0 deletions exercises/practice/strain/.meta/tests.toml
Original file line number Diff line number Diff line change
@@ -0,0 +1,52 @@
# This is an auto-generated file.
#
# Regenerating this file via `configlet sync` will:
# - Recreate every `description` key/value pair
# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
# - Preserve any other key/value pair
#
# As user-added comments (using the # character) will be removed when this file
# is regenerated, comments can be added via a `comment` key.

[26af8c32-ba6a-4eb3-aa0a-ebd8f136e003]
description = "keep on empty list returns empty list"

[f535cb4d-e99b-472a-bd52-9fa0ffccf454]
description = "keeps everything"

[950b8e8e-f628-42a8-85e2-9b30f09cde38]
description = "keeps nothing"

[92694259-6e76-470c-af87-156bdf75018a]
description = "keeps first and last"

[938f7867-bfc7-449e-a21b-7b00cbb56994]
description = "keeps neither first nor last"

[8908e351-4437-4d2b-a0f7-770811e48816]
description = "keeps strings"

[2728036b-102a-4f1e-a3ef-eac6160d876a]
description = "keeps lists"

[ef16beb9-8d84-451a-996a-14e80607fce6]
description = "discard on empty list returns empty list"

[2f42f9bc-8e06-4afe-a222-051b5d8cd12a]
description = "discards everything"

[ca990fdd-08c2-4f95-aa50-e0f5e1d6802b]
description = "discards nothing"

[71595dae-d283-48ca-a52b-45fa96819d2f]
description = "discards first and last"

[ae141f79-f86d-4567-b407-919eaca0f3dd]
description = "discards neither first nor last"

[daf25b36-a59f-4f29-bcfe-302eb4e43609]
description = "discards strings"

[a38d03f9-95ad-4459-80d1-48e937e4acaf]
description = "discards lists"
14 changes: 13 additions & 1 deletion exercises/practice/strain/test/strain_tests.erl
Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ keep_everything_test() ->
keep_first_last_test() ->
?assertEqual([1, 3], strain:keep(fun(X) -> odd(X) end, [1,2,3])).

keep_nothin_test() ->
keep_nothing_test() ->
?assertEqual([], strain:keep(fun(X) -> even(X) end, [1,3,5,7])).

keep_neither_first_nor_last_test() ->
Expand All @@ -24,6 +24,12 @@ keep_strings_test() ->
["zebra", "zombies", "zealot"],
strain:keep(fun(S) -> string:sub_string(S, 1,1) =:= "z" end, Str)).

keep_lists_test() ->
List = [[1, 2, 3], [5, 5, 5], [5, 1, 2], [2, 1, 2], [1, 5, 2], [2, 2, 1], [1, 2, 5]],
?assertEqual(
[[5, 5, 5], [5, 1, 2], [1, 5, 2], [1, 2, 5]],
strain:keep(fun(L) -> lists:member(5, L) end, List)).

empty_discard_test() ->
?assertEqual([], strain:discard(fun(X) -> X < 10 end, [])).

Expand All @@ -45,6 +51,12 @@ discard_strings_test() ->
["apple", "banana", "cherimoya"],
strain:discard(fun(S) -> string:sub_string(S, 1,1) =:= "z" end, Str)).

discard_lists_test() ->
List = [[1, 2, 3], [5, 5, 5], [5, 1, 2], [2, 1, 2], [1, 5, 2], [2, 2, 1], [1, 2, 5]],
?assertEqual(
[[1, 2, 3], [2, 1, 2], [2, 2, 1]],
strain:discard(fun(L) -> lists:member(5, L) end, List)).

odd(N) -> N rem 2 > 0.

even(N) -> N rem 2 =:= 0.
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