Function CreateTestFile

internal/testutil/test_files.go:27–61

CreateTestFile creates a test file with the specified size filled with either zeros or random data.

(dir, name string, size int64, random bool)

// CreateTestFile creates a test file with the specified size filled
// with either zeros or random data.
func CreateTestFile(dir, name string, size int64, random bool) (string, error) {
	path := filepath.Join(dir, name)

	f, err := os.Create(path)
	if err != nil {
		return "", err
	}
	defer func() { _ = f.Close() }()

	if random {
		// Write in chunks for large files
		chunkSize := int64(64 * types.KB) // 64KB
		chunk := make([]byte, chunkSize)
		remaining := size

		for remaining > 0 {
			if remaining < chunkSize {
				chunk = make([]byte, remaining)
			}
			_, _ = rand.Read(chunk)
			n, err := f.Write(chunk)
			if err != nil {
				return "", err
			}
			remaining -= int64(n)
		}
	} else {
		// Pre-allocate with zeros (sparse file)
		if err := f.Truncate(size); err != nil {
			return "", err
		}
	}

	return path, nil
}

// CreateSurgeFile creates a .surge partial download file for resume testing.
func CreateSurgeFile(dir, name string, totalSize, downloadedSize int64) (string, error) {