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[README] New syntax in Swift Error Handling #160

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jeffh merged 1 commit into from
Aug 3, 2015
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[README] New syntax in Swift Error Handling #160

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15 changes: 10 additions & 5 deletions README.md
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Expand Up @@ -652,19 +652,24 @@ expect(actual).to(beNil());

## Swift Error Handling

If you're using Swift 2.0+, you can use the `throwAnError` matcher to check if an error is thrown.
If you're using Swift 2.0+, you can use the `throwError` matcher to check if an error is thrown.

```swift
// Swift

// Passes if somethingThatThrows() throws an ErrorType:
expect{ try somethingThatThrows() }.to(throwAnError())
expect{ try somethingThatThrows() }.to(throwError())

// Passes if somethingThatThrows() throws an error with a given domain:
expect{ try somethingThatThrows() }.to(throwAnError { error in
let nserror = error as NSError
expect(nserror.domain).to(equal(NSInternalInconsistencyException))
expect{ try somethingThatThrows() }.to(throwError { error in
expect(error._domain).to(equal(NSCocoaErrorDomain))
})

// Passes if somethingThatThrows() throws an error with a given case:
expect{ try somethingThatThrows() }.to(throwError(NSCocoaError.PropertyListReadCorruptError))

// Passes if somethingThatThrows() throws an error with a given type:
expect{ try somethingThatThrows() }.to(throwError(errorType: MyError.self))
```

Note: This feature is only available in Swift.
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