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Add a matcher to negate a passed in matcher (#1151)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| /// A matcher that negates the passed in matcher | ||
| /// | ||
| /// - Note: If the passed-in matcher unconditionally fails, then `not` also unconditionally fails. | ||
| public func not<T>(_ matcher: Matcher<T>) -> Matcher<T> { | ||
| Matcher { actualExpression in | ||
| negateMatcherResult( | ||
| try matcher.satisfies(actualExpression) | ||
| ) | ||
| } | ||
| } | ||
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| /// A matcher that negates the passed in matcher | ||
| /// | ||
| /// - Note: If the passed-in matcher unconditionally fails, then `not` also unconditionally fails. | ||
| public func not<T>(_ matcher: AsyncMatcher<T>) -> AsyncMatcher<T> { | ||
| AsyncMatcher { actualExpression in | ||
| negateMatcherResult( | ||
| try await matcher.satisfies(actualExpression) | ||
| ) | ||
| } | ||
| } | ||
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| private func negateMatcherResult(_ matcherResult: MatcherResult) -> MatcherResult { | ||
| let status: MatcherStatus | ||
| switch matcherResult.status { | ||
| case .matches: | ||
| status = .doesNotMatch | ||
| case .doesNotMatch: | ||
| status = .matches | ||
| case .fail: | ||
| status = .fail | ||
| } | ||
| return MatcherResult( | ||
| status: status, | ||
| message: matcherResult.message.prepended(expectation: "not ") | ||
| ) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import XCTest | ||
| import Nimble | ||
| #if SWIFT_PACKAGE | ||
| import NimbleSharedTestHelpers | ||
| #endif | ||
|
|
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| final class NegationTest: XCTestCase { | ||
| func testSyncNil() { | ||
| expect(nil as Int?).toNot(not(beNil())) | ||
|
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| failsWithErrorMessage("expected to not be nil, got <nil>") { | ||
| expect(nil as Int?).to(not(beNil())) | ||
| } | ||
| } | ||
|
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| func testSyncNonNil() { | ||
| expect(1).to(not(equal(2))) | ||
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| failsWithErrorMessage("expected to not equal <2>, got <2>") { | ||
| expect(2).to(not(equal(2))) | ||
| } | ||
| } | ||
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| func testAsyncNil() async { | ||
| @Sendable func nilFunc() async -> Int? { | ||
| nil | ||
| } | ||
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| await expect(nilFunc).toNot(not(beNil())) | ||
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| await failsWithErrorMessage("expected to not be nil, got <nil>") { | ||
| await expect(nilFunc).to(not(beNil())) | ||
| } | ||
| } | ||
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| func testAsyncNonNil() async { | ||
| await expect(1).to(not(asyncEqual(2))) | ||
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| await failsWithErrorMessage("expected to not equal <2>, got <2>") { | ||
| await expect(2).to(not(asyncEqual(2))) | ||
| } | ||
| } | ||
| } |