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Adds matchers for Swift 5 Result type
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| import Foundation | ||
|
|
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| /// | ||
| /// A Nimble matcher for Result that succeeds when the actual value is success | ||
| /// | ||
| /// You can pass a closure to do any arbitrary custom matching | ||
| /// to the value inside result. The closure only gets called when result is success. | ||
| public func beSuccess<T>(test: ((T) -> Void)? = nil) -> Predicate<Result<T, Error>> { | ||
| return Predicate.define("be <success>") { expression, message in | ||
| guard case let .success(value)? = try expression.evaluate() | ||
| else { | ||
| return PredicateResult(status: .doesNotMatch, message: message) | ||
| } | ||
| test?(value) | ||
| return PredicateResult(status: .matches, message: message) | ||
| } | ||
| } | ||
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| /// | ||
| /// A Nimble matcher for Result that succeeds when the actual value is failure | ||
| /// | ||
| /// You can pass a closure to do custom matching for the error inside result. | ||
| /// The closure only gets called when result is failure. | ||
| public func beFailure<T>(test: ((Error) -> Void)? = nil) -> Predicate<Result<T, Error>> { | ||
| return Predicate.define("be <failure>") { expression, message in | ||
| guard case let .failure(error)? = try expression.evaluate() | ||
| else { | ||
| return PredicateResult(status: .doesNotMatch, message: message) | ||
| } | ||
| test?(error) | ||
| return PredicateResult(status: .matches, message: message) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| import XCTest | ||
| import Nimble | ||
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| private struct StubError: Error, CustomDebugStringConvertible { | ||
| let debugDescription = "StubError" | ||
| } | ||
|
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| final class BeSuccessTest: XCTestCase { | ||
| func testPositiveMatch() { | ||
| let successfulResult: Result<Int, Error> = .success(1) | ||
| expect(successfulResult).to(beSuccess()) | ||
| } | ||
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| func testPositiveMatchWithValueTesting() { | ||
| let stubValue = 1 | ||
| let successfulResult: Result<Int, Error> = .success(stubValue) | ||
| expect(successfulResult).to(beSuccess { value in | ||
| expect(value).to(equal(stubValue)) | ||
| }) | ||
| } | ||
|
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| func testNegativeMatch() { | ||
| let failureResult: Result<Int, Error> = .failure(StubError()) | ||
| expect(failureResult).toNot(beSuccess()) | ||
| } | ||
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| func testExpectationFailureMessage() { | ||
| let failureResult: Result<Int, Error> = .failure(StubError()) | ||
| failsWithErrorMessage("expected to be <success>, got <failure(StubError)>") { | ||
| expect(failureResult).to(beSuccess()) | ||
| } | ||
| } | ||
| } | ||
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| final class BeFailureTest: XCTestCase { | ||
| func testPositiveMatch() { | ||
| let failureResult: Result<Int, Error> = .failure(StubError()) | ||
| expect(failureResult).to(beFailure()) | ||
| } | ||
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| func testPositiveMatchWithValueTesting() { | ||
| let failureResult: Result<Int, Error> = .failure(StubError()) | ||
| expect(failureResult).to(beFailure { value in | ||
| expect(value).to(matchError(StubError.self)) | ||
| }) | ||
| } | ||
|
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| func testNegativeMatch() { | ||
| let successfulResult: Result<Int, Error> = .success(1) | ||
| expect(successfulResult).toNot(beFailure()) | ||
| } | ||
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| func testExpectationFailureMessage() { | ||
| let successfulResult: Result<Int, Error> = .success(1) | ||
| failsWithErrorMessage("expected to be <failure>, got <success(1)>") { | ||
| expect(successfulResult).to(beFailure()) | ||
| } | ||
| } | ||
| } |