public void Test()
{
string a = Xmtool.Captcha().Random(4);
string b = Xmtool.Captcha().Random(4);
string c = Xmtool.Captcha().Random(4);
string d = Xmtool.Captcha().RandomOnlyNumber(4);
string e = Xmtool.Captcha().RandomOnlyNumber(4);
string f = Xmtool.Captcha().RandomOnlyNumber(4);
string code;
MemoryStream stream;
Xmtool.Captcha().Build(100, 45, out stream, out code, true, 4);
Assert.Equal(4, code.Length);
Assert.NotNull(stream);
Assert.True(stream.Length > 0);
}