anchor.diff:  				Boot:       true,
   				AutoDelete: true,
   				InitializeParams: &compute.AttachedDiskInitializeParams{
  -					SourceImage: "projects/debian-cloud/global/images/family/debian-9",
  -				},
  -			},
  -			{
  -				AutoDelete: true,
  -				InitializeParams: &compute.AttachedDiskInitializeParams{
  -					SourceImage: "projects/debian-cloud/global/images/family/debian-9",
  +					SourceImage: "projects/debian-cloud/global/images/family/debian-11",
  +				},
  +			},
  +			{
  +				AutoDelete: true,
  +				InitializeParams: &compute.AttachedDiskInitializeParams{
  +					SourceImage: "projects/debian-cloud/global/images/family/debian-11",
   				},
   				DiskEncryptionKey: &compute.CustomerEncryptionKey{
   					RawKey: "SGVsbG8gZnJvbSBHb29nbGUgQ2xvdWQgUGxhdGZvcm0=",
  
positive.code: 				Boot:       true,
  				AutoDelete: true,
  				InitializeParams: &compute.AttachedDiskInitializeParams{
  					SourceImage: "projects/debian-cloud/global/images/family/debian-9",
  				},
  			},
  		},
  
negative.code: 				Boot:       true,
  				AutoDelete: true,
  				InitializeParams: &compute.AttachedDiskInitializeParams{
  					SourceImage: "projects/debian-cloud/global/images/family/debian-11",
  				},
  			},
  			{
  