108 lines
2.5 KiB
Elixir
108 lines
2.5 KiB
Elixir
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defmodule StrainTest do
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use ExUnit.Case
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defp is_odd?(n), do: rem(n, 2) == 1
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defp is_even?(n), do: rem(n, 2) == 0
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describe "keep" do
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# @tag :pending
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test "on empty list returns empty list" do
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assert Strain.keep([], fn _ -> true end) == []
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end
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# @tag :pending
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test "keep everything" do
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assert Strain.keep([1, 3, 5], fn _ -> true end) == [1, 3, 5]
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end
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# @tag :pending
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test "keep nothing" do
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assert Strain.keep([1, 3, 5], fn _ -> false end) == []
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end
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# @tag :pending
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test "keep first and last" do
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assert Strain.keep([1, 2, 3], &is_odd?/1) == [1, 3]
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end
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# @tag :pending
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test "keep neither first nor last" do
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assert Strain.keep([1, 2, 3], &is_even?/1) == [2]
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end
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# @tag :pending
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test "keep strings" do
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words = ~w(apple zebra banana zombies cherimoya zelot)
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assert Strain.keep(words, &String.starts_with?(&1, "z")) == ~w(zebra zombies zelot)
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end
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# @tag :pending
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test "keep lists" do
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rows = [
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[1, 2, 3],
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[5, 5, 5],
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[5, 1, 2],
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[2, 1, 2],
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[1, 5, 2],
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[2, 2, 1],
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[1, 2, 5]
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]
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assert Strain.keep(rows, fn row -> 5 in row end) == [
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[5, 5, 5],
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[5, 1, 2],
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[1, 5, 2],
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[1, 2, 5]
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]
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end
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end
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describe "discard" do
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# @tag :pending
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test "on empty list returns empty list" do
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assert Strain.discard([], fn _ -> true end) == []
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end
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# @tag :pending
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test "discard everything" do
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assert Strain.discard([1, 3, 5], fn _ -> true end) == []
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end
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# @tag :pending
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test "discard nothing" do
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assert Strain.discard([1, 3, 5], fn _ -> false end) == [1, 3, 5]
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end
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# @tag :pending
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test "discard first and last" do
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assert Strain.discard([1, 2, 3], &is_odd?/1) == [2]
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end
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# @tag :pending
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test "discard neither first nor last" do
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assert Strain.discard([1, 2, 3], &is_even?/1) == [1, 3]
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end
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# @tag :pending
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test "discard strings" do
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words = ~w(apple zebra banana zombies cherimoya zelot)
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assert Strain.discard(words, &String.starts_with?(&1, "z")) == ~w(apple banana cherimoya)
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end
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# @tag :pending
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test "discard arrays" do
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rows = [
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[1, 2, 3],
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[5, 5, 5],
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[5, 1, 2],
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[2, 1, 2],
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[1, 5, 2],
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[2, 2, 1],
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[1, 2, 5]
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]
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assert Strain.discard(rows, fn row -> 5 in row end) == [[1, 2, 3], [2, 1, 2], [2, 2, 1]]
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end
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end
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end
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