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# moduleName

The name of the module containing the source file.

```
var moduleName: String { get }
```

## Discussion

The name of the module is derived from this instance’s [`fileID`](/documentation/Testing/SourceLocation/fileID)
property. It consists of the substring of the file ID up to the first
forward-slash character (`"/"`.) For example, if the value of this
instance’s [`fileID`](/documentation/Testing/SourceLocation/fileID) property is `"FoodTruck/WheelTests.swift"`, the
module name is `"FoodTruck"`.

The structure of file IDs is described in the documentation for the
[`#fileID`](https://developer.apple.com/documentation/swift/fileID())
macro in the Swift standard library.

## See Also

[`fileID`](/documentation/Testing/SourceLocation/fileID)

The file ID of the source file.

[`fileName`](/documentation/Testing/SourceLocation/fileName)

The name of the source file.

  [`#fileID`](https://developer.apple.com/documentation/swift/fileID())


---

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