cache = lru.New(cacheSize)
	}
	return &envelopeTransformer{
		envelopeService:     envelopeService,
		transformers:        cache,
		baseTransformerFunc: baseTransformerFunc,
		cacheEnabled:        cacheSize > 0,
		cacheSize:           cacheSize,
	}
}

// TransformFromStorage decrypts data encrypted by this transformer using envelope encryption.

	tests := []struct {
		name        string
		key         []byte
		transformer value.Transformer
	}{
		{
			name:        "empty key",
			key:         []byte{},
			transformer: &envelopeTransformer{},
		},
		{
			name:        "nil transformer",
			key:         []byte("key"),
			transformer: nil,
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			defer func() {