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# setUp()

Provides an opportunity to customize initial state before a test case begins.

```
class func setUp()
```

## Discussion

The [`setUp()`](/documentation/XCTest/XCTestCase/setUp()) class method is called exactly once for a test case, before its first test method is called. Override this method to customize the initial state for all tests in the test case.

## See Also

[`setUp()`](/documentation/XCTest/XCTest/setUp())

Provides an opportunity to reset state before calling each test method in a test case.


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