public void TestFileExists()
{
var fileName = "foo.txt";
var filePath = Path.Combine("%temp%", fileName);
var absoluteFilePath = Path.Combine(Path.GetTempPath(), fileName);
_node.FileExists(filePath).Should().BeFalse();
_node.FileExists(absoluteFilePath).Should().BeFalse();
_fileSystem.DirectoryExists(Path.GetTempPath());
_fileSystem.WriteAllText(Path.Combine(Path.GetTempPath(), fileName), "Whasup");
_node.FileExists(filePath).Should().BeTrue();
_node.FileExists(absoluteFilePath).Should().BeTrue();
_fileSystem.DeleteFile(Path.Combine(Path.GetTempPath(), fileName));
_node.FileExists(filePath).Should().BeFalse();
_node.FileExists(absoluteFilePath).Should().BeFalse();
}