src/lib/fmt/fmt_test.go

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package fmt

import (
	"fmt";
	"io";
	"math";
	"syscall";
	"testing";
)

func TestFmtInterface(t *testing.T) {
	var i1 interface{};
	i1 = "abc";
	s := fmt.Sprintf("%s", i1);
	if s != "abc" {
		t.Errorf(`fmt.Sprintf("%%s", empty("abc")) = %q want %q`, s, "abc");
	}
}

type fmtTest struct {
	fmt string;
	val interface { };
	out string;
}

const b32 uint32 = 1<<32 - 1
const b64 uint64 = 1<<64 - 1
var array = []int(1, 2, 3, 4, 5)


var fmttests = []fmtTest(
	// basic string
	fmtTest( "%s",	"abc",	"abc" ),
	fmtTest( "%x",	"abc",	"616263" ),
	fmtTest( "%x",	"xyz",	"78797a" ),
	fmtTest( "%X",	"xyz",	"78797A" ),
	fmtTest( "%q",	"abc",	`"abc"` ),

	// basic bytes
	fmtTest( "%s",	io.StringBytes("abc"),	"abc" ),
	fmtTest( "%x",	io.StringBytes("abc"),	"616263" ),
	fmtTest( "% x",	io.StringBytes("abc"),	"61 62 63" ),
	fmtTest( "%x",	io.StringBytes("xyz"),	"78797a" ),
	fmtTest( "%X",	io.StringBytes("xyz"),	"78797A" ),
	fmtTest( "%q",	io.StringBytes("abc"),	`"abc"` ),

	// escaped strings
	fmtTest( "%#q",	`abc`,		"`abc`" ),
	fmtTest( "%#q",	`"`,		"`\"`" ),
	fmtTest( "1 %#q", `\n`,		"1 `\\n`" ),
	fmtTest( "2 %#q", "\n",		`2 "\n"` ),
	fmtTest( "%q",	`"`,		`"\""` ),
	fmtTest( "%q",	"\a\b\f\r\n\t\v",	`"\a\b\f\r\n\t\v"` ),
	fmtTest( "%q",	"abc\xffdef",		`"abc\xffdef"` ),
	fmtTest( "%q",	"\u263a",	`"\u263a"` ),
	fmtTest( "%q",	"\U0010ffff",	`"\U0010ffff"` ),

	// width
	fmtTest( "%5s",		"abc",	"  abc" ),
	fmtTest( "%-5s",	"abc",	"abc  " ),
	fmtTest( "%05s",	"abc",	"00abc" ),

	// integers
	fmtTest( "%d",		12345,	"12345" ),
	fmtTest( "%d",		-12345,	"-12345" ),
	fmtTest( "%10d",	12345,	"     12345" ),
	fmtTest( "%10d",	-12345,	"    -12345" ),
	fmtTest( "%+10d",	12345,	"    +12345" ),
	fmtTest( "%010d",	12345,	"0000012345" ),
	fmtTest( "%010d",	-12345,	"-000012345" ),
	fmtTest( "%-10d",	12345,	"12345     " ),
	fmtTest( "%010.3d",	1,	"       001" ),
	fmtTest( "%010.3d",	-1,	"      -001" ),
	fmtTest( "%+d",		12345,	"+12345" ),
	fmtTest( "%+d",		-12345,	"-12345" ),
	fmtTest( "% d",		12345,	" 12345" ),
	fmtTest( "% d",		-12345,	"-12345" ),

	// arrays
	// TODO: when arrays work in interfaces, enable this line
	// and delete the TestArrayPrinter routine below
	// fmtTest{ "%v",		array,			"[1 2 3 4 5]" },
	fmtTest( "%v",		&array,			"&[1 2 3 4 5]" ),

	// old test/fmt_test.go
	fmtTest( "%d",		1234,			"1234" ),
	fmtTest( "%d",		-1234,			"-1234" ),
	fmtTest( "%d",		uint(1234),		"1234" ),
	fmtTest( "%d",		uint32(b32),		"4294967295" ),
	fmtTest( "%d",		uint64(b64),		"18446744073709551615" ),
	fmtTest( "%o",		01234,			"1234" ),
	fmtTest( "%o",		uint32(b32),		"37777777777" ),
	fmtTest( "%o",		uint64(b64),		"1777777777777777777777" ),
	fmtTest( "%x",		0x1234abcd,		"1234abcd" ),
	fmtTest( "%x",		b32-0x1234567,		"fedcba98" ),
	fmtTest( "%X",		0x1234abcd,		"1234ABCD" ),
	fmtTest( "%X",		b32-0x1234567,		"FEDCBA98" ),
	fmtTest( "%x",		b64,			"ffffffffffffffff" ),
	fmtTest( "%b",		7,			"111" ),
	fmtTest( "%b",		b64,			"1111111111111111111111111111111111111111111111111111111111111111" ),
	fmtTest( "%e",		float64(1),		"1.000000e+00" ),
	fmtTest( "%e",		float64(1234.5678e3),	"1.234568e+06" ),
	fmtTest( "%e",		float64(1234.5678e-8),	"1.234568e-05" ),
	fmtTest( "%e",		float64(-7),		"-7.000000e+00" ),
	fmtTest( "%e",		float64(-1e-9),		"-1.000000e-09" ),
	fmtTest( "%f",		float64(1234.5678e3),	"1234567.800000" ),
	fmtTest( "%f",		float64(1234.5678e-8),	"0.000012" ),
	fmtTest( "%f",		float64(-7),		"-7.000000" ),
	fmtTest( "%f",		float64(-1e-9),		"-0.000000" ),
	fmtTest( "%g",		float64(1234.5678e3),	"1.2345678e+06" ),
	fmtTest( "%g",		float32(1234.5678e3),	"1.2345678e+06" ),
	fmtTest( "%g",		float64(1234.5678e-8),	"1.2345678e-05" ),
	fmtTest( "%g",		float64(-7),		"-7" ),
	fmtTest( "%g",		float64(-1e-9),		"-1e-09",	 ),
	fmtTest( "%g",		float32(-1e-9),		"-1e-09" ),
	fmtTest( "%c",		'x',			"x" ),
	fmtTest( "%c",		0xe4,			"ä" ),
	fmtTest( "%c",		0x672c,			"本" ),
	fmtTest( "%c",		'日',			"日" ),
	fmtTest( "%20.8d",	1234,			"            00001234" ),
	fmtTest( "%20.8d",	-1234,			"           -00001234" ),
	fmtTest( "%20d",	1234,			"                1234" ),
	fmtTest( "%-20.8d",	1234,			"00001234            " ),
	fmtTest( "%-20.8d",	-1234,			"-00001234           " ),
	fmtTest( "%.20b",	7,			"00000000000000000111" ),
	fmtTest( "%20.5s",	"qwertyuiop",		"               qwert" ),
	fmtTest( "%.5s",	"qwertyuiop",		"qwert" ),
	fmtTest( "%-20.5s",	"qwertyuiop",		"qwert               " ),
	fmtTest( "%20c",	'x',			"                   x" ),
	fmtTest( "%-20c",	'x',			"x                   " ),
	fmtTest( "%20.6e",	1.2345e3,		"        1.234500e+03" ),
	fmtTest( "%20.6e",	1.2345e-3,		"        1.234500e-03" ),
	fmtTest( "%20e",	1.2345e3,		"        1.234500e+03" ),
	fmtTest( "%20e",	1.2345e-3,		"        1.234500e-03" ),
	fmtTest( "%20.8e",	1.2345e3,		"      1.23450000e+03" ),
	fmtTest( "%20f",	float64(1.23456789e3),	"         1234.567890" ),
	fmtTest( "%20f",	float64(1.23456789e-3),	"            0.001235" ),
	fmtTest( "%20f",	float64(12345678901.23456789),	"  12345678901.234568" ),
	fmtTest( "%-20f",	float64(1.23456789e3),	"1234.567890         " ),
	fmtTest( "%20.8f",	float64(1.23456789e3),	"       1234.56789000" ),
	fmtTest( "%20.8f",	float64(1.23456789e-3),	"          0.00123457" ),
	fmtTest( "%g",		float64(1.23456789e3),	"1234.56789" ),
	fmtTest( "%g",		float64(1.23456789e-3),	"0.00123456789" ),
	fmtTest( "%g",		float64(1.23456789e20),	"1.23456789e+20" ),
	fmtTest( "%20e",	math.Inf(1),		"                +Inf" ),
	fmtTest( "%-20f",	math.Inf(-1),		"-Inf                " ),
	fmtTest( "%20g",	math.NaN(),		"                 NaN" ),
)

func TestSprintf(t *testing.T) {
	for i := 0; i < len(fmttests); i++ {
		tt := fmttests[i];
		s := fmt.Sprintf(tt.fmt, tt.val);
		if s != tt.out {
			if ss, ok := tt.val.(string); ok {
				// Don't requote the already-quoted strings.
				// It's too confusing to read the errors.
				t.Errorf("fmt.Sprintf(%q, %q) = %s want %s", tt.fmt, tt.val, s, tt.out);
			} else {
				t.Errorf("fmt.Sprintf(%q, %v) = %q want %q", tt.fmt, tt.val, s, tt.out);
			}
		}
	}
}

type flagPrinter struct { }
func (*flagPrinter) Format(f fmt.Formatter, c int) {
	s := "%";
	for i := 0; i < 128; i++ {
		if f.Flag(i) {
			s += string(i);
		}
	}
	if w, ok := f.Width(); ok {
		s += fmt.Sprintf("%d", w);
	}
	if p, ok := f.Precision(); ok {
		s += fmt.Sprintf(".%d", p);
	}
	s += string(c);
	io.WriteString(f, "["+s+"]");
}

type flagTest struct {
	in string;
	out string;
}

var flagtests = []flagTest (
	flagTest( "%a", "[%a]" ),
	flagTest( "%-a", "[%-a]" ),
	flagTest( "%+a", "[%+a]" ),
	flagTest( "%#a", "[%#a]" ),
	flagTest( "% a", "[% a]" ),
	flagTest( "%0a", "[%0a]" ),
	flagTest( "%1.2a", "[%1.2a]" ),
	flagTest( "%-1.2a", "[%-1.2a]" ),
	flagTest( "%+1.2a", "[%+1.2a]" ),
	flagTest( "%-+1.2a", "[%+-1.2a]" ),
	flagTest( "%-+1.2abc", "[%+-1.2a]bc" ),
	flagTest( "%-1.2abc", "[%-1.2a]bc" ),
)

func TestFlagParser(t *testing.T) {
	var flagprinter flagPrinter;
	for i := 0; i < len(flagtests); i++ {
		tt := flagtests[i];
		s := fmt.Sprintf(tt.in, &flagprinter);
		if s != tt.out {
			t.Errorf("Sprintf(%q, &flagprinter) => %q, want %q", tt.in, s, tt.out);
		}
	}
}

func TestStructPrinter(t *testing.T) {
	var s struct {
		a string;
		b string;
		c int;
	};
	s.a = "abc";
	s.b = "def";
	s.c = 123;
	type Test struct {
		fmt string;
		out string;
	}
	var tests = []Test (
		Test( "%v", "{abc def 123}" ),
		Test( "%+v", "{a=abc b=def c=123}" ),
	);
	for i := 0; i < len(tests); i++ {
		tt := tests[i];
		out := fmt.Sprintf(tt.fmt, s);
		if out != tt.out {
			t.Errorf("Sprintf(%q, &s) = %q, want %q", tt.fmt, out, tt.out);
		}
	}
}

func TestArrayPrinter(t *testing.T) {
	a := []int(1, 2, 3, 4, 5);
	want := "[1 2 3 4 5]";
	out := fmt.Sprintf("%v", a);
	if out != want {
		t.Errorf("Sprintf(%%v, array) = %q, want %q", out, want);
	}
	want = "&" + want;
	out = fmt.Sprintf("%v", &a);
	if out != want {
		t.Errorf("Sprintf(%%v, &array) = %q, want %q", out, want);
	}
}