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MatchError.swift
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MatchError.swift
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import Foundation
/// A Nimble matcher that succeeds when the actual expression evaluates to an
/// error from the specified case.
///
/// Errors are tried to be compared by their implementation of Equatable,
/// otherwise they fallback to comparison by _domain and _code.
public func matchError<T: Error>(_ error: T) -> Predicate<Error> {
return Predicate.define { actualExpression in
let actualError = try actualExpression.evaluate()
let failureMessage = FailureMessage()
setFailureMessageForError(
failureMessage,
postfixMessageVerb: "match",
actualError: actualError,
error: error
)
var matches = false
if let actualError = actualError, errorMatchesExpectedError(actualError, expectedError: error) {
matches = true
}
return PredicateResult(bool: matches, message: failureMessage.toExpectationMessage())
}
}
/// A Nimble matcher that succeeds when the actual expression evaluates to an
/// error from the specified case.
///
/// Errors are tried to be compared by their implementation of Equatable,
/// otherwise they fallback to comparision by _domain and _code.
public func matchError<T: Error & Equatable>(_ error: T) -> Predicate<Error> {
return Predicate.define { actualExpression in
let actualError = try actualExpression.evaluate()
let failureMessage = FailureMessage()
setFailureMessageForError(
failureMessage,
postfixMessageVerb: "match",
actualError: actualError,
error: error
)
var matches = false
if let actualError = actualError as? T, error == actualError {
matches = true
}
return PredicateResult(bool: matches, message: failureMessage.toExpectationMessage())
}
}
/// A Nimble matcher that succeeds when the actual expression evaluates to an
/// error of the specified type
public func matchError<T: Error>(_ errorType: T.Type) -> Predicate<Error> {
return Predicate.define { actualExpression in
let actualError = try actualExpression.evaluate()
let failureMessage = FailureMessage()
setFailureMessageForError(
failureMessage,
postfixMessageVerb: "match",
actualError: actualError,
errorType: errorType
)
var matches = false
if actualError as? T != nil {
matches = true
}
return PredicateResult(bool: matches, message: failureMessage.toExpectationMessage())
}
}