object aDirectory : Keyword
(source)
A helper construct to allow expressing expectations about a path being a directory. It can be used for a parameterless function so that it has one parameter and thus can be used as infix function.
val file = tempDir.newFile("test_file")
val dir = tempDir.newDirectory("test_dir")
expect(dir) toBe aDirectory
fails {
expect(file) toBe aDirectory
}