You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: repository_internal_test.go
    path of file: ./repos/restic/internal/repository
    
    the code of the file until where you have to start completion: package repository

import (
	"bytes"
	"context"
	"encoding/json"
	"io"
	"math/rand"
    
func TestBlobVerification(t *testing.T) {
	repo := TestRepository(t).(*Repository)

	type DamageType string
	const (
		damageData       DamageType = "data"
		damageCompressed DamageType = "compressed"
		damageCiphertext DamageType = "ciphertext"
	)

	for _, test := range []struct {
		damage DamageType
		msg    string
	}{
		{"", ""},
		{damageData, "hash mismatch"},
		{damageCompressed, "decompression failed"},
		{damageCiphertext, "ciphertext verification failed"},
	} {
		plaintext := rtest.Random(800, 1234)
		id := restic.Hash(plaintext)
		if test.damage == damageData {
			plaintext[42] ^= 0x42
		}

		uncompressedLength := uint(len(plaintext))
		plaintext = repo.getZstdEncoder().EncodeAll(plaintext, nil)

		if test.damage == damageCompressed {
			plaintext = plaintext[:len(plaintext)-8]
		}

		nonce := crypto.NewRandomNonce()
		ciphertext := append([]byte{}, nonce...)
		ciphertext = repo.Key().Seal(ciphertext, nonce, plaintext, nil)

		if test.damage == damageCiphertext {
			ciphertext[42] ^= 0x42
		}

		err := repo.verifyCiphertext(ciphertext, int(uncompressedLength), id)
		if test.msg == "" {
			rtest.Assert(t, err == nil, "expected no error, got %v", err)
		} else {
			rtest.Assert(t, strings.Contains(err.Error(), test.msg), "expected error to contain %q, got %q", test.msg, err)
		}
	}
}