github.com/containerd/nerdctl@v1.7.7/pkg/containerutil/container_network_manager_test.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package containerutil
    18  
    19  import (
    20  	"fmt"
    21  	"testing"
    22  
    23  	"gotest.tools/v3/assert"
    24  )
    25  
    26  func TestZeroMapValues(t *testing.T) {
    27  	emptyString := ""
    28  	testCases := []struct {
    29  		key          string
    30  		value        interface{}
    31  		shouldBeZero bool
    32  	}{
    33  		{
    34  			key:          "false",
    35  			value:        false,
    36  			shouldBeZero: true,
    37  		},
    38  		{
    39  			key:          "true",
    40  			value:        true,
    41  			shouldBeZero: false,
    42  		},
    43  		{
    44  			key:          "zeroInt",
    45  			value:        int(0),
    46  			shouldBeZero: true,
    47  		},
    48  		{
    49  			key:          "nonZeroInt",
    50  			value:        int(1),
    51  			shouldBeZero: false,
    52  		},
    53  		{
    54  			key:          "zeroString",
    55  			value:        "",
    56  			shouldBeZero: true,
    57  		},
    58  		{
    59  			key:          "nonZeroString",
    60  			value:        "non-zero",
    61  			shouldBeZero: false,
    62  		},
    63  		{
    64  			key:          "nilPointer",
    65  			value:        (*string)(nil),
    66  			shouldBeZero: true,
    67  		},
    68  		{
    69  			key:   "pointerToEmpty",
    70  			value: &emptyString,
    71  			// technically just a nil pointer check, so any value should be non-Zero:
    72  			shouldBeZero: false,
    73  		},
    74  		{
    75  			key:          "nilSlice",
    76  			value:        []string(nil),
    77  			shouldBeZero: true,
    78  		},
    79  		{
    80  			key:          "emptySlice",
    81  			value:        []string{},
    82  			shouldBeZero: false,
    83  		},
    84  		{
    85  			key:          "nonEmptySlice",
    86  			value:        []string{"non-empty"},
    87  			shouldBeZero: false,
    88  		},
    89  		{
    90  			key:          "nilMap",
    91  			value:        map[string]int(nil),
    92  			shouldBeZero: true,
    93  		},
    94  		{
    95  			key:          "emptyMap",
    96  			value:        map[string]int{},
    97  			shouldBeZero: false,
    98  		},
    99  		{
   100  			key:          "nonEmptyMap",
   101  			value:        map[string]int{"non-empty": 42},
   102  			shouldBeZero: false,
   103  		},
   104  	}
   105  
   106  	for _, tc := range testCases {
   107  		testName := fmt.Sprintf("%s=%t", tc.key, tc.shouldBeZero)
   108  		t.Run(testName, func(tt *testing.T) {
   109  			result := nonZeroMapValues(map[string]interface{}{tc.key: tc.value})
   110  			if tc.shouldBeZero {
   111  				assert.Equal(tt, len(result), 0)
   112  			} else {
   113  				assert.Equal(tt, len(result), 1)
   114  			}
   115  		})
   116  	}
   117  }