public void EncodeBase64()
{
StringOperators.EncodeBase64(null).Should().BeNull();
StringOperators.EncodeBase64("").Should().Be("");
StringOperators.EncodeBase64("Ewout").Should().Be("RXdvdXQ=");
StringOperators.EncodeBase64("Ewout>").Should().Be("RXdvdXQ+");
StringOperators.EncodeBase64("编码方式").Should().Be("57yW56CB5pa55byP");
StringOperators.FpEncode("Ewout", "base64").Should().Be("RXdvdXQ=");
}