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# Nil and Non-Nil Assertions

Check whether a test condition has, or doesn’t have, a value.

## Topics

### Tests for a Nil Condition

[`XCTAssertNil(_:_:file:line:)`](/documentation/XCTest/XCTAssertNil(_:_:file:line:))

Asserts that an expression is `nil`.

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

Asserts that an expression is `nil`.

### Tests for a Non-Nil Condition

[`XCTAssertNotNil(_:_:file:line:)`](/documentation/XCTest/XCTAssertNotNil(_:_:file:line:))

Asserts that an expression is not `nil`.

[`XCTUnwrap(_:_:file:line:)`](/documentation/XCTest/XCTUnwrap(_:_:file:line:))

Asserts that an expression is not `nil,` and returns the unwrapped value.

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

Asserts that an expression is not `nil`.


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