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/*
Copyright 2014 SAP SE
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package driver
import (
"math/big"
"testing"
)
func testDecimalInfo(t *testing.T) {
t.Logf("maximum decimal value %v", maxDecimal)
t.Logf("~log2(10): %f", lg10)
}
func testDigits10(t *testing.T) {
testData := []struct {
x *big.Int
digits int
}{
{new(big.Int).SetInt64(0), 1},
{new(big.Int).SetInt64(1), 1},
{new(big.Int).SetInt64(9), 1},
{new(big.Int).SetInt64(10), 2},
{new(big.Int).SetInt64(99), 2},
{new(big.Int).SetInt64(100), 3},
{new(big.Int).SetInt64(999), 3},
{new(big.Int).SetInt64(1000), 4},
{new(big.Int).SetInt64(9999), 4},
{new(big.Int).SetInt64(10000), 5},
{new(big.Int).SetInt64(99999), 5},
{new(big.Int).SetInt64(100000), 6},
{new(big.Int).SetInt64(999999), 6},
{new(big.Int).SetInt64(1000000), 7},
{new(big.Int).SetInt64(9999999), 7},
{new(big.Int).SetInt64(10000000), 8},
{new(big.Int).SetInt64(99999999), 8},
{new(big.Int).SetInt64(100000000), 9},
{new(big.Int).SetInt64(999999999), 9},
{new(big.Int).SetInt64(1000000000), 10},
{new(big.Int).SetInt64(9999999999), 10},
}
for i, d := range testData {
digits := digits10(d.x)
if d.digits != digits {
t.Fatalf("value %d int %s digits %d - expected digits %d", i, d.x, digits, d.digits)
}
}
}
func testConvertRat(t *testing.T) {
testData := []struct {
// in
x *big.Rat
digits int
minExp int
maxExp int
// out
cmp *big.Int
neg bool
exp int
df decFlags
}{
{new(big.Rat).SetFrac64(0, 1), 3, -2, 2, new(big.Int).SetInt64(0), false, 0, 0}, //convert 0
{new(big.Rat).SetFrac64(1, 1), 3, -2, 2, new(big.Int).SetInt64(1), false, 0, 0}, //convert 1
{new(big.Rat).SetFrac64(1, 10), 3, -2, 2, new(big.Int).SetInt64(1), false, -1, 0}, //convert 1/10
{new(big.Rat).SetFrac64(1, 99), 3, -2, 2, new(big.Int).SetInt64(1), false, -2, dfNotExact}, //convert 1/99
{new(big.Rat).SetFrac64(1, 100), 3, -2, 2, new(big.Int).SetInt64(1), false, -2, 0}, //convert 1/100
{new(big.Rat).SetFrac64(1, 1000), 3, -2, 2, new(big.Int).SetInt64(1), false, -3, dfUnderflow}, //convert 1/1000
{new(big.Rat).SetFrac64(10, 1), 3, -2, 2, new(big.Int).SetInt64(1), false, 1, 0}, //convert 10
{new(big.Rat).SetFrac64(100, 1), 3, -2, 2, new(big.Int).SetInt64(1), false, 2, 0}, //convert 100
{new(big.Rat).SetFrac64(1000, 1), 3, -2, 2, new(big.Int).SetInt64(10), false, 2, 0}, //convert 1000
{new(big.Rat).SetFrac64(10000, 1), 3, -2, 2, new(big.Int).SetInt64(100), false, 2, 0}, //convert 10000
{new(big.Rat).SetFrac64(100000, 1), 3, -2, 2, new(big.Int).SetInt64(100), false, 3, dfOverflow}, //convert 100000
{new(big.Rat).SetFrac64(999999, 1), 3, -2, 2, new(big.Int).SetInt64(100), false, 4, dfNotExact | dfOverflow}, //convert 999999
{new(big.Rat).SetFrac64(99999, 1), 3, -2, 2, new(big.Int).SetInt64(100), false, 3, dfNotExact | dfOverflow}, //convert 99999
{new(big.Rat).SetFrac64(9999, 1), 3, -2, 2, new(big.Int).SetInt64(100), false, 2, dfNotExact}, //convert 9999
{new(big.Rat).SetFrac64(99950, 1), 3, -2, 2, new(big.Int).SetInt64(100), false, 3, dfNotExact | dfOverflow}, //convert 99950
{new(big.Rat).SetFrac64(99949, 1), 3, -2, 2, new(big.Int).SetInt64(999), false, 2, dfNotExact}, //convert 99949
{new(big.Rat).SetFrac64(1, 3), 5, -5, 5, new(big.Int).SetInt64(33333), false, -5, dfNotExact}, //convert 1/3
{new(big.Rat).SetFrac64(2, 3), 5, -5, 5, new(big.Int).SetInt64(66667), false, -5, dfNotExact}, //convert 2/3
{new(big.Rat).SetFrac64(11, 2), 5, -5, 5, new(big.Int).SetInt64(55), false, -1, 0}, //convert 11/2
}
m := new(big.Int)
for i := 0; i < 1; i++ { // use for performance tests
for j, d := range testData {
neg, exp, df := convertRatToDecimal(d.x, m, d.digits, d.minExp, d.maxExp)
if m.Cmp(d.cmp) != 0 || neg != d.neg || exp != d.exp || df != d.df {
t.Fatalf("converted %d value m %s neg %t exp %d df %b - expected m %s neg %t exp %d df %b", j, m, neg, exp, df, d.cmp, d.neg, d.exp, d.df)
}
}
}
}
func TestDecimal(t *testing.T) {
tests := []struct {
name string
fct func(t *testing.T)
}{
{"decimalInfo", testDecimalInfo},
{"digits10", testDigits10},
{"convertRat", testConvertRat},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
test.fct(t)
})
}
}
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