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# withKnownIssue(_:isIntermittent:sourceLocation:_:)

Invoke a function that has a known issue that is expected to occur during
its execution.

```
func withKnownIssue(_ comment: Comment? = nil, isIntermittent: Bool = false, sourceLocation: SourceLocation = #_sourceLocation, _ body: () throws -> Void)
```

## Parameters

`comment`

An optional comment describing the known issue.

`isIntermittent`

Whether or not the known issue occurs intermittently. If
this argument is `true` and the known issue does not occur, no secondary
issue is recorded.

`sourceLocation`

The source location to which any recorded issues should
be attributed.

`body`

The function to invoke.

## Discussion

Use this function when a test is known to record one or more issues that
should not cause the test to fail. For example:

```swift
@Test func example() {
  withKnownIssue {
    try flakyCall()
  }
}
```

Because all errors thrown by `body` are caught as known issues, this
function is not throwing. If only some errors or issues are known to occur
while others should continue to cause test failures, use
[`withKnownIssue(_:isIntermittent:sourceLocation:_:when:matching:)`](/documentation/Testing/withKnownIssue(_:isIntermittent:sourceLocation:_:when:matching:))
instead.

## See Also

[Known issues](/documentation/Testing/known-issues)

Mark issues as known when running tests.


---

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