github.com/whtcorpsinc/milevadb-prod@v0.0.0-20211104133533-f57f4be3b597/soliton/math/math_test.go (about)

     1  // Copyright 2020 WHTCORPS INC, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package math
    15  
    16  import (
    17  	"math/rand"
    18  	"strconv"
    19  	"testing"
    20  
    21  	. "github.com/whtcorpsinc/check"
    22  )
    23  
    24  func TestT(t *testing.T) {
    25  	TestingT(t)
    26  }
    27  
    28  var _ = Suite(&testMath{})
    29  
    30  type testMath struct{}
    31  
    32  func (s *testMath) TestStrLenOfUint64Fast_RandomTestCases(c *C) {
    33  	for i := 0; i < 1000000; i++ {
    34  		num := rand.Uint64()
    35  		expected := len(strconv.FormatUint(num, 10))
    36  		actual := StrLenOfUint64Fast(num)
    37  		c.Assert(actual, Equals, expected)
    38  	}
    39  }
    40  
    41  func (s *testMath) TestStrLenOfUint64Fast_ManualTestCases(c *C) {
    42  	nums := [22]uint64{0,
    43  		1, 12, 123, 1234, 12345,
    44  		123456, 1234567, 12345678, 123456789, 1234567890,
    45  		1234567891, 12345678912, 123456789123, 1234567891234, 12345678912345,
    46  		123456789123456, 1234567891234567, 12345678912345678, 123456789123456789,
    47  		123456789123457890,
    48  		^uint64(0),
    49  	}
    50  
    51  	for _, num := range nums {
    52  		expected := len(strconv.FormatUint(num, 10))
    53  		actual := StrLenOfUint64Fast(num)
    54  		c.Assert(actual, Equals, expected)
    55  	}
    56  }