public void DecodeAsString_ToStringEncoded()
        {
            // Arrange
            var context = new TestCaseContext();

            var sut = new Base64Encoder(
                context.Options,
                context.Logger,
                context.StringEncoder);

            var data = "MTIz";

            // Act
            sut.DecodeAsString(data);

            // Assert
            Mock.Get(context.StringEncoder).Verify(
                m => m.EncodeToString(It.IsAny <byte[]>()),
                Times.Once);
        }