public void GetLastFileCommit() {
var dir = FileSystemHelper.ResetTemporaryDirectory();
var gh = new GitHelper {DirectoryName = dir};
Directory.CreateDirectory(Path.Combine(dir, "a"));
var file = Path.Combine(dir, "a", "x");
File.WriteAllText(file, "zzz");
var file2 = Path.Combine(dir, "a", "y");
File.WriteAllText(file2, "zzz2");
gh.Init();
gh.CommitAllChanges();
var fstCommit = gh.GetCommitId();
File.WriteAllText(file2, "zzz3");
gh.CommitAllChanges();
var secCommit = gh.GetCommitId();
Assert.AreEqual(fstCommit,gh.GetFileCommit(file).Hash);
Assert.AreEqual(secCommit,gh.GetFileCommit(file2).Hash);
}