github.com/m3db/m3@v1.5.1-0.20231129193456-75a402aa583b/src/dbnode/encoding/proto/common_test.go (about)

     1  // Copyright (c) 2019 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package proto
    22  
    23  import (
    24  	"testing"
    25  
    26  	"github.com/stretchr/testify/require"
    27  )
    28  
    29  func TestNumBitsRequiredForNumUpToN(t *testing.T) {
    30  	testCases := []struct {
    31  		input          int
    32  		expectedOutput int
    33  	}{
    34  		{
    35  			input:          0,
    36  			expectedOutput: 0,
    37  		},
    38  		{
    39  			input:          1,
    40  			expectedOutput: 1,
    41  		},
    42  		{
    43  			input:          2,
    44  			expectedOutput: 2,
    45  		},
    46  		{
    47  			input:          4,
    48  			expectedOutput: 3,
    49  		},
    50  		{
    51  			input:          5,
    52  			expectedOutput: 3,
    53  		},
    54  		{
    55  			input:          8,
    56  			expectedOutput: 4,
    57  		},
    58  		{
    59  			input:          9,
    60  			expectedOutput: 4,
    61  		},
    62  		{
    63  			input:          15,
    64  			expectedOutput: 4,
    65  		},
    66  		{
    67  			input:          16,
    68  			expectedOutput: 5,
    69  		},
    70  		{
    71  			input:          31,
    72  			expectedOutput: 5,
    73  		},
    74  		{
    75  			input:          32,
    76  			expectedOutput: 6,
    77  		},
    78  		{
    79  			input:          63,
    80  			expectedOutput: 6,
    81  		},
    82  		{
    83  			input:          64,
    84  			expectedOutput: 7,
    85  		},
    86  	}
    87  
    88  	for _, tc := range testCases {
    89  		output := numBitsRequiredForNumUpToN(tc.input)
    90  		require.Equal(t, tc.expectedOutput, output, "failed for input %d", tc.input)
    91  	}
    92  }