---
title: "XCTAssertIdentical(_:_:_:file:line:)"
framework: xctest
role: symbol
role_heading: Function
path: "xctest/xctassertidentical(_:_:_:file:line:)"
---

# XCTAssertIdentical(_:_:_:file:line:)

Asserts that two values are identical.

## Declaration

```swift
func XCTAssertIdentical(_ expression1: @autoclosure () throws -> AnyObject?, _ expression2: @autoclosure () throws -> AnyObject?, _ message: @autoclosure () -> String = "", file: StaticString = #filePath, line: UInt = #line)
```

## Parameters

- `expression1`: An optional expression of type doc://com.apple.documentation/documentation/Swift/AnyObject.
- `expression2`: A second optional expression of type doc://com.apple.documentation/documentation/Swift/AnyObject.
- `message`: An optional description of a failure.
- `file`: The file where the failure occurs. The default is the filename of the test case where you call this function.
- `line`: The line number where the failure occurs. The default is the line number where you call this function.

## Discussion

Discussion Compare two optional values of types that conform to AnyObject. The values are identical if they’re the same instance.

## See Also

### Tests for Identical Objects

- [XCTAssertNotIdentical(_:_:_:file:line:)](xctest/xctassertnotidentical(_:_:_:file:line:).md)