}

func TestBuilderString(t *testing.T) {
	var b Builder
	b.WriteString("alpha")
	check(t, &b, "alpha")
	s1 := b.String()
	b.WriteString("beta")
	check(t, &b, "alphabeta")
	s2 := b.String()
	b.WriteString("gamma")
	check(t, &b, "alphabetagamma")
	s3 := b.String()

	// Check that subsequent operations didn't change the returned strings.
	if want := "alpha"; s1 != want {
		t.Errorf("first String result is now %q; want %q", s1, want)

// What you see here may be used freely but it comes with no support or
// guarantee.
//
//   The two known misprints in the book are repaired here in the
// source listings for the gamma function and the incomplete beta
// integral.
//
//   Stephen L. Moshier
//   ******@****.***

// Complex circular tangent
//
// DESCRIPTION:
//
// If
//     z = x + iy,
//
// then

ehamn","krokoms","kumla","kungsbacka","kungsör","kungälv","kävlinge","köping","laholm","landskrona","laxå","lekeberg","leksand","lerum","lessebo","lidingö","lidköping","lilla edets","lindesbergs","linköpings","ljungby","ljusdals","ljusnarsbergs","lomma","ludvika","luleå","lunds","lycksele","lysekil","malmö","malung-sälen","malå","mariestad","marks","markaryd","mellerud","mjölby","mora","motala","mullsjö","munkedal","munkfors","mölndal","mönsterås","mörbylånga","nacka","nora","norberg","nordansti...

#SNG: from basn6a08.png
IHDR {
    width: 32; height: 32; bitdepth: 8;
    using color alpha;
}
gAMA {1.0000}
IMAGE {
    pixels hex
ff000800 ff000808 ff000810 ff000818 ff000820 ff000829 ff000831 ff000839 ff000841 ff00084a ff000852 ff00085a ff000862 ff00086a ff000873 ff00087b ff000883 ff00088b ff000894 ff00089c ff0008a4 ff0008ac ff0008b4 ff0008bd ff0008c5 ff0008cd ff0008d5 ff0008de ff0008e6 ff0008ee ff0008f6 ff0008ff 

#SNG: from basn0g16.png
IHDR {
    width: 32; height: 32; bitdepth: 16;
    using grayscale;
}
gAMA {1.0000}
IMAGE {
    pixels hex
0000 0900 1200 1b00 2400 2d00 3600 3f00 4800 5100 5a00 6300 6c00 7500 7e00 8700 9000 9900 a200 ab00 b400 bd00 c600 cf00 d800 e100 ea00 f300 fc00 f0ff d5ff baff 
0200 0b00 1400 1d00 2600 2f00 3800 4100 4a00 5300 5c00 6500 6e00 7700 8000 8900 9200 9b00 a400 ad00 b600 bf00 c800 d100 da00 e300 ec00 f500 fe00 eaff cfff b4ff 

#SNG: from basn2c08.png
IHDR {
    width: 32; height: 32; bitdepth: 8;
    using color;
}
gAMA {1.0000}
IMAGE {
    pixels hex
ffffff fffffe fffffd fffffc fffffb fffffa fffff9 fffff8 fffff7 fffff6 fffff5 fffff4 fffff3 fffff2 fffff1 fffff0 ffffef ffffee ffffed ffffec ffffeb ffffea ffffe9 ffffe8 ffffe7 ffffe6 ffffe5 ffffe4 ffffe3 ffffe2 ffffe1 ffffe0 

#SNG: from ftbwn0g16.png
IHDR {
    width: 32; height: 32; bitdepth: 16;
    using grayscale;
}
gAMA {1.0000}
bKGD {gray: 65535;}
tRNS {
    gray: 65535;
}
IMAGE {
    pixels hex
ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff 

#SNG: from ftp0n2c08.png
IHDR {
    width: 32; height: 32; bitdepth: 8;
    using color;
}
gAMA {1.0000}
IMAGE {
    pixels hex
7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 7f7f7f 

#SNG: from ftbrn2c08.png
IHDR {
    width: 32; height: 32; bitdepth: 8;
    using color;
}
gAMA {1.0000}
bKGD {red: 255;  green: 0;  blue: 0;}
tRNS {
    red: 255; green: 255; blue: 255;
}
IMAGE {
    pixels hex
ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff ffffff