github.com/rafaeltorres324/go/src@v0.0.0-20210519164414-9fdf653a9838/strconv/strconv_test.go (about)

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package strconv_test
     6  
     7  import (
     8  	"runtime"
     9  	. "strconv"
    10  	"strings"
    11  	"testing"
    12  )
    13  
    14  var (
    15  	globalBuf [64]byte
    16  	nextToOne = "1.00000000000000011102230246251565404236316680908203125" + strings.Repeat("0", 10000) + "1"
    17  
    18  	mallocTest = []struct {
    19  		count int
    20  		desc  string
    21  		fn    func()
    22  	}{
    23  		{0, `AppendInt(localBuf[:0], 123, 10)`, func() {
    24  			var localBuf [64]byte
    25  			AppendInt(localBuf[:0], 123, 10)
    26  		}},
    27  		{0, `AppendInt(globalBuf[:0], 123, 10)`, func() { AppendInt(globalBuf[:0], 123, 10) }},
    28  		{0, `AppendFloat(localBuf[:0], 1.23, 'g', 5, 64)`, func() {
    29  			var localBuf [64]byte
    30  			AppendFloat(localBuf[:0], 1.23, 'g', 5, 64)
    31  		}},
    32  		{0, `AppendFloat(globalBuf[:0], 1.23, 'g', 5, 64)`, func() { AppendFloat(globalBuf[:0], 1.23, 'g', 5, 64) }},
    33  		// In practice we see 7 for the next one, but allow some slop.
    34  		// Before pre-allocation in appendQuotedWith, we saw 39.
    35  		{10, `AppendQuoteToASCII(nil, oneMB)`, func() { AppendQuoteToASCII(nil, string(oneMB)) }},
    36  		{0, `ParseFloat("123.45", 64)`, func() { ParseFloat("123.45", 64) }},
    37  		{0, `ParseFloat("123.456789123456789", 64)`, func() { ParseFloat("123.456789123456789", 64) }},
    38  		{0, `ParseFloat("1.000000000000000111022302462515654042363166809082031251", 64)`, func() {
    39  			ParseFloat("1.000000000000000111022302462515654042363166809082031251", 64)
    40  		}},
    41  		{0, `ParseFloat("1.0000000000000001110223024625156540423631668090820312500...001", 64)`, func() {
    42  			ParseFloat(nextToOne, 64)
    43  		}},
    44  	}
    45  )
    46  
    47  var oneMB []byte // Will be allocated to 1MB of random data by TestCountMallocs.
    48  
    49  func TestCountMallocs(t *testing.T) {
    50  	if testing.Short() {
    51  		t.Skip("skipping malloc count in short mode")
    52  	}
    53  	if runtime.GOMAXPROCS(0) > 1 {
    54  		t.Skip("skipping; GOMAXPROCS>1")
    55  	}
    56  	// Allocate a big messy buffer for AppendQuoteToASCII's test.
    57  	oneMB = make([]byte, 1e6)
    58  	for i := range oneMB {
    59  		oneMB[i] = byte(i)
    60  	}
    61  	for _, mt := range mallocTest {
    62  		allocs := testing.AllocsPerRun(100, mt.fn)
    63  		if max := float64(mt.count); allocs > max {
    64  			t.Errorf("%s: %v allocs, want <=%v", mt.desc, allocs, max)
    65  		}
    66  	}
    67  }
    68  
    69  func TestErrorPrefixes(t *testing.T) {
    70  	_, errInt := Atoi("INVALID")
    71  	_, errBool := ParseBool("INVALID")
    72  	_, errFloat := ParseFloat("INVALID", 64)
    73  	_, errInt64 := ParseInt("INVALID", 10, 64)
    74  	_, errUint64 := ParseUint("INVALID", 10, 64)
    75  
    76  	vectors := []struct {
    77  		err  error  // Input error
    78  		want string // Function name wanted
    79  	}{
    80  		{errInt, "Atoi"},
    81  		{errBool, "ParseBool"},
    82  		{errFloat, "ParseFloat"},
    83  		{errInt64, "ParseInt"},
    84  		{errUint64, "ParseUint"},
    85  	}
    86  
    87  	for _, v := range vectors {
    88  		nerr, ok := v.err.(*NumError)
    89  		if !ok {
    90  			t.Errorf("test %s, error was not a *NumError", v.want)
    91  			continue
    92  		}
    93  		if got := nerr.Func; got != v.want {
    94  			t.Errorf("mismatching Func: got %s, want %s", got, v.want)
    95  		}
    96  	}
    97  
    98  }