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Source file src/strconv/decimal_test.go

Documentation: strconv

  // 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 strconv_test
  
  import (
  	. "strconv"
  	"testing"
  )
  
  type shiftTest struct {
  	i     uint64
  	shift int
  	out   string
  }
  
  var shifttests = []shiftTest{
  	{0, -100, "0"},
  	{0, 100, "0"},
  	{1, 100, "1267650600228229401496703205376"},
  	{1, -100,
  		"0.00000000000000000000000000000078886090522101180541" +
  			"17285652827862296732064351090230047702789306640625",
  	},
  	{12345678, 8, "3160493568"},
  	{12345678, -8, "48225.3046875"},
  	{195312, 9, "99999744"},
  	{1953125, 9, "1000000000"},
  }
  
  func TestDecimalShift(t *testing.T) {
  	for i := 0; i < len(shifttests); i++ {
  		test := &shifttests[i]
  		d := NewDecimal(test.i)
  		d.Shift(test.shift)
  		s := d.String()
  		if s != test.out {
  			t.Errorf("Decimal %v << %v = %v, want %v",
  				test.i, test.shift, s, test.out)
  		}
  	}
  }
  
  type roundTest struct {
  	i               uint64
  	nd              int
  	down, round, up string
  	int             uint64
  }
  
  var roundtests = []roundTest{
  	{0, 4, "0", "0", "0", 0},
  	{12344999, 4, "12340000", "12340000", "12350000", 12340000},
  	{12345000, 4, "12340000", "12340000", "12350000", 12340000},
  	{12345001, 4, "12340000", "12350000", "12350000", 12350000},
  	{23454999, 4, "23450000", "23450000", "23460000", 23450000},
  	{23455000, 4, "23450000", "23460000", "23460000", 23460000},
  	{23455001, 4, "23450000", "23460000", "23460000", 23460000},
  
  	{99994999, 4, "99990000", "99990000", "100000000", 99990000},
  	{99995000, 4, "99990000", "100000000", "100000000", 100000000},
  	{99999999, 4, "99990000", "100000000", "100000000", 100000000},
  
  	{12994999, 4, "12990000", "12990000", "13000000", 12990000},
  	{12995000, 4, "12990000", "13000000", "13000000", 13000000},
  	{12999999, 4, "12990000", "13000000", "13000000", 13000000},
  }
  
  func TestDecimalRound(t *testing.T) {
  	for i := 0; i < len(roundtests); i++ {
  		test := &roundtests[i]
  		d := NewDecimal(test.i)
  		d.RoundDown(test.nd)
  		s := d.String()
  		if s != test.down {
  			t.Errorf("Decimal %v RoundDown %d = %v, want %v",
  				test.i, test.nd, s, test.down)
  		}
  		d = NewDecimal(test.i)
  		d.Round(test.nd)
  		s = d.String()
  		if s != test.round {
  			t.Errorf("Decimal %v Round %d = %v, want %v",
  				test.i, test.nd, s, test.down)
  		}
  		d = NewDecimal(test.i)
  		d.RoundUp(test.nd)
  		s = d.String()
  		if s != test.up {
  			t.Errorf("Decimal %v RoundUp %d = %v, want %v",
  				test.i, test.nd, s, test.up)
  		}
  	}
  }
  
  type roundIntTest struct {
  	i     uint64
  	shift int
  	int   uint64
  }
  
  var roundinttests = []roundIntTest{
  	{0, 100, 0},
  	{512, -8, 2},
  	{513, -8, 2},
  	{640, -8, 2},
  	{641, -8, 3},
  	{384, -8, 2},
  	{385, -8, 2},
  	{383, -8, 1},
  	{1, 100, 1<<64 - 1},
  	{1000, 0, 1000},
  }
  
  func TestDecimalRoundedInteger(t *testing.T) {
  	for i := 0; i < len(roundinttests); i++ {
  		test := roundinttests[i]
  		d := NewDecimal(test.i)
  		d.Shift(test.shift)
  		int := d.RoundedInteger()
  		if int != test.int {
  			t.Errorf("Decimal %v >> %v RoundedInteger = %v, want %v",
  				test.i, test.shift, int, test.int)
  		}
  	}
  }
  

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