public void FileExists()
{
Assert.ThrowsExact <ArgumentNullException>(() => Assert.FileExists(null as string));
Assert.ThrowsExact <ArgumentNullException>(() => Assert.FileExists(null as FileInfo));
Assert.ThrowsExact <AssertionException>(() => Assert.FileExists(NonExistingFile));
Assert.ThrowsExact <AssertionException>(() => Assert.FileExists(NonExistingFileInfo));
Assert.ThrowsExact <AssertionException>(() => Assert.FileExists(new FileInfo(NonExistingFile)));
Assert.DoesNotThrow(() => Assert.FileExists(ExistingFile));
Assert.DoesNotThrow(() => Assert.FileExists(ExistingFileInfo));
}