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

# XCTAssertNotNil(_:_:file:line:)

Asserts that an expression is not nil.

## Declaration

```swift
func XCTAssertNotNil(_ expression: @autoclosure () throws -> Any?, _ message: @autoclosure () -> String = "", file: StaticString = #filePath, line: UInt = #line)
```

## Parameters

- `expression`: An expression of type Any? to compare against nil.
- `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 This function generates a failure when expression == nil.

## See Also

### Tests for a Non-Nil Condition

- [XCTUnwrap(_:_:file:line:)](xctest/xctunwrap(_:_:file:line:).md)