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SwiftTestingで例外処理をテストする

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エラーがthrowされることをテストする

@Suite final class SampleTests {    
    @Test func throwErrorTest() throws {
        // なにかしらのエラーがthrowされることをテスト
        #expect(throws: (any Error).self) {
            try sample()
        }

        // SampleTestErrorがthrowされることをテスト
        #expect(throws: SampleTestError.self) {
            try sample()
        }

        // SampleTestError.hogehogeがthrowされることをテスト
        #expect(throws: SampleTestError.hogehoge) {
            try sample()
        }
    }
}

associatedValueの中身もテストする

@Suite final class SampleTests {    
    @Test func throwErrorTest() throws {
        #expect {
            try sample()
        } throws: { error in
            guard let error = error as? SampleTestError,
                  case let .fugafuga(code) = error
            else {
                return false
            }
            return code == 400
        }
    }
}

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