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// Copyright 2019 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package math
import (
"math/rand"
"strconv"
"testing"
. "github.com/pingcap/check"
)
func TestT(t *testing.T) {
TestingT(t)
}
var _ = Suite(&testMath{})
type testMath struct{}
func (s *testMath) TestStrLenOfUint64Fast_RandomTestCases(c *C) {
for i := 0; i < 1000000; i++ {
num := rand.Uint64()
expected := len(strconv.FormatUint(num, 10))
actual := StrLenOfUint64Fast(num)
c.Assert(actual, Equals, expected)
}
}
func (s *testMath) TestStrLenOfUint64Fast_ManualTestCases(c *C) {
nums := [22]uint64{0,
1, 12, 123, 1234, 12345,
123456, 1234567, 12345678, 123456789, 1234567890,
1234567891, 12345678912, 123456789123, 1234567891234, 12345678912345,
123456789123456, 1234567891234567, 12345678912345678, 123456789123456789,
123456789123457890,
^uint64(0),
}
for _, num := range nums {
expected := len(strconv.FormatUint(num, 10))
actual := StrLenOfUint64Fast(num)
c.Assert(actual, Equals, expected)
}
}