public void MountFailsWhenNoGitObjectsRootInRepoMetadata()
{
this.Enlistment.UnmountGSD();
string majorVersion;
string minorVersion;
GSDHelpers.GetPersistedDiskLayoutVersion(this.Enlistment.DotGSDRoot, out majorVersion, out minorVersion);
majorVersion.ShouldNotBeNull();
minorVersion.ShouldNotBeNull();
string localCacheRoot = GSDHelpers.GetPersistedLocalCacheRoot(this.Enlistment.DotGSDRoot).ShouldNotBeNull();
string metadataPath = Path.Combine(this.Enlistment.DotGSDRoot, GSDHelpers.RepoMetadataName);
string metadataBackupPath = metadataPath + ".backup";
this.fileSystem.MoveFile(metadataPath, metadataBackupPath);
this.fileSystem.CreateEmptyFile(metadataPath);
GSDHelpers.SaveDiskLayoutVersion(this.Enlistment.DotGSDRoot, majorVersion, minorVersion);
GSDHelpers.SaveLocalCacheRoot(this.Enlistment.DotGSDRoot, localCacheRoot);
this.MountShouldFail("Failed to determine git objects root from repo metadata");
this.fileSystem.DeleteFile(metadataPath);
this.fileSystem.MoveFile(metadataBackupPath, metadataPath);
this.Enlistment.MountGSD();
}