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# XCTAssertIdentical

Asserts that two values are identical.

```
#define XCTAssertIdentical(expression1, expression2, ...)
```

## Parameters

`expression1`

An expression of type `id`.

`expression2`

A second expression of type `id`.

`…`

An optional description of a failure. A literal <doc://com.apple.documentation/documentation/Foundation/NSString>, optionally with string format specifiers.

## Discussion

Compare two values of type `id`. The values are identical if they’re the same instance.

## See Also

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

Asserts that two objects are equal.


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