菜单
When testing Either values, compare the value directly with shouldBe instead of checking isLeft, so test failures show the actual value. Use when writing or reviewing Haskell test code that asserts on Either or similar values.
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基于 SOC 职业分类
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himari is ncaq's rio-like custom Haskell Prelude. Import it with a single `import Himari`, never `import Himari.Prelude` or other submodules directly. Use when writing or reviewing Haskell code in a project that depends on the himari package.
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| name | test-equal |
| description | When testing Either values, compare the value directly with shouldBe instead of checking isLeft, so test failures show the actual value. Use when writing or reviewing Haskell test code that asserts on Either or similar values. |
| user-invocable | false |
値xをテストするときに、
値xがEitherの値である場合は、
次のように書くのは避けます。
isLeft x `shouldBe` True
このように書くとテストフレームワーク側に、 実際どのような値が入っていたのかの情報が伝わらないため、 テスト失敗時に情報がなくなってしまいます。
Eitherの値がShowとEqのインスタンスである場合は以下のように単純に比較できます。
x `shouldBe` Left "expected error"
Eqのインスタンスでない場合でも、
isLeftの結果をshouldBeに渡すよりは、
実際の中身の振る舞いを検査できる関数が、
テストフレームワーク側に用意されているはずなので、
それを使うべきです。