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math/big: more Float conversion tests 

Change-Id: Ia30886569141ca2e0321bea6ee1d5c9e0f79d6f9
Reviewed-on: https://go-review.googlesource.com/3941
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Robert Griesemer 2015-02-04 16:31:59 -08:00
parent 57c1485fd9
commit 91c0f006fc
1 changed files with 90 additions and 1 deletions
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91
src/math/big/floatconv_test.go
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@ -5,6 +5,7 @@
package big
import (
"io"
"math"
"strconv"
"testing"
@ -167,7 +168,7 @@ func TestFloat64Format(t *testing.T) {
{below1e23, 'e', 17, "9.99999999999999748e+22"},
{below1e23, 'f', 17, "99999999999999974834176.00000000000000000"},
// {below1e23, 'g', 17, "9.9999999999999975e+22"},
{below1e23, 'g', 17, "9.9999999999999975e+22"},
// {below1e23, 'e', -1, "9.999999999999997e+22"},
// {below1e23, 'f', -1, "99999999999999970000000"},
@ -236,3 +237,91 @@ func TestFloat64Format(t *testing.T) {
}
}
}
func TestFloatFormat(t *testing.T) {
for _, test := range []struct {
x string
format byte
prec int
want string
}{
{"0", 'f', 0, "0"},
{"-0", 'f', 0, "-0"},
{"1", 'f', 0, "1"},
{"-1", 'f', 0, "-1"},
{"1.459", 'e', 0, "1e+00"},
{"2.459", 'e', 1, "2.5e+00"},
{"3.459", 'e', 2, "3.46e+00"},
{"4.459", 'e', 3, "4.459e+00"},
{"5.459", 'e', 4, "5.4590e+00"},
{"1.459", 'E', 0, "1E+00"},
{"2.459", 'E', 1, "2.5E+00"},
{"3.459", 'E', 2, "3.46E+00"},
{"4.459", 'E', 3, "4.459E+00"},
{"5.459", 'E', 4, "5.4590E+00"},
{"1.459", 'f', 0, "1"},
{"2.459", 'f', 1, "2.5"},
{"3.459", 'f', 2, "3.46"},
{"4.459", 'f', 3, "4.459"},
{"5.459", 'f', 4, "5.4590"},
{"1.459", 'g', 0, "1"},
{"2.459", 'g', 1, "2"},
{"3.459", 'g', 2, "3.5"},
{"4.459", 'g', 3, "4.46"},
{"5.459", 'g', 4, "5.459"},
{"1459", 'g', 0, "1e+03"},
{"2459", 'g', 1, "2e+03"},
{"3459", 'g', 2, "3.5e+03"},
{"4459", 'g', 3, "4.46e+03"},
{"5459", 'g', 4, "5459"},
{"1459", 'G', 0, "1E+03"},
{"2459", 'G', 1, "2E+03"},
{"3459", 'G', 2, "3.5E+03"},
{"4459", 'G', 3, "4.46E+03"},
{"5459", 'G', 4, "5459"},
{"3", 'e', 40, "3.0000000000000000000000000000000000000000e+00"},
{"3", 'f', 40, "3.0000000000000000000000000000000000000000"},
{"3", 'g', 40, "3"},
{"3e40", 'e', 40, "3.0000000000000000000000000000000000000000e+40"},
{"3e40", 'f', 4, "30000000000000000000000000000000000000000.0000"},
{"3e40", 'g', 40, "3e+40"},
// TODO(gri) need tests for actual large Floats
// These depend on the selected mantissa length to match strconv.FormatFloat.
// Disabled for now.
// {"0", 'b', 0, "0"},
// {"-0", 'b', 0, "-0"},
// {"1.0", 'b', 0, "4503599627370496p-52"},
// {"-1.0", 'b', 0, "-4503599627370496p-52"},
// {"4503599627370496", 'b', 0, "4503599627370496p+0"},
{"0", 'p', 0, "0"},
{"-0", 'p', 0, "-0"},
{"1024.0", 'p', 0, "0x.8p11"},
{"-1024.0", 'p', 0, "-0x.8p11"},
// unsupported format
{"3.14", 'x', 0, "%x"},
} {
f, _, err := ParseFloat(test.x, 0, 1000, ToNearestEven)
// TODO(gri) should we return io.EOF at the end?
if err != nil && err != io.EOF {
t.Errorf("%v: %s", test, err)
continue
}
got := f.Format(test.format, test.prec)
if got != test.want {
t.Errorf("%v: got %s; want %s", test, got, test.want)
}
}
}