ptr_test.go

Documentation: k8s.io/utils/ptr

     1  /*
     2  Copyright 2023 The Kubernetes 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 ptr_test
    18  
    19  import (
    20  	"fmt"
    21  	"testing"
    22  
    23  	"k8s.io/utils/ptr"
    24  )
    25  
    26  func TestAllPtrFieldsNil(t *testing.T) {
    27  	testCases := []struct {
    28  		obj      interface{}
    29  		expected bool
    30  	}{
    31  		{struct{}{}, true},
    32  		{struct{ Foo int }{12345}, true},
    33  		{&struct{ Foo int }{12345}, true},
    34  		{struct{ Foo *int }{nil}, true},
    35  		{&struct{ Foo *int }{nil}, true},
    36  		{struct {
    37  			Foo int
    38  			Bar *int
    39  		}{12345, nil}, true},
    40  		{&struct {
    41  			Foo int
    42  			Bar *int
    43  		}{12345, nil}, true},
    44  		{struct {
    45  			Foo *int
    46  			Bar *int
    47  		}{nil, nil}, true},
    48  		{&struct {
    49  			Foo *int
    50  			Bar *int
    51  		}{nil, nil}, true},
    52  		{struct{ Foo *int }{new(int)}, false},
    53  		{&struct{ Foo *int }{new(int)}, false},
    54  		{struct {
    55  			Foo *int
    56  			Bar *int
    57  		}{nil, new(int)}, false},
    58  		{&struct {
    59  			Foo *int
    60  			Bar *int
    61  		}{nil, new(int)}, false},
    62  		{(*struct{})(nil), true},
    63  	}
    64  	for i, tc := range testCases {
    65  		name := fmt.Sprintf("case[%d]", i)
    66  		t.Run(name, func(t *testing.T) {
    67  			if actual := ptr.AllPtrFieldsNil(tc.obj); actual != tc.expected {
    68  				t.Errorf("%s: expected %t, got %t", name, tc.expected, actual)
    69  			}
    70  		})
    71  	}
    72  }
    73  
    74  func TestRef(t *testing.T) {
    75  	type T int
    76  
    77  	val := T(0)
    78  	pointer := ptr.To(val)
    79  	if *pointer != val {
    80  		t.Errorf("expected %d, got %d", val, *pointer)
    81  	}
    82  
    83  	val = T(1)
    84  	pointer = ptr.To(val)
    85  	if *pointer != val {
    86  		t.Errorf("expected %d, got %d", val, *pointer)
    87  	}
    88  }
    89  
    90  func TestDeref(t *testing.T) {
    91  	type T int
    92  
    93  	var val, def T = 1, 0
    94  
    95  	out := ptr.Deref(&val, def)
    96  	if out != val {
    97  		t.Errorf("expected %d, got %d", val, out)
    98  	}
    99  
   100  	out = ptr.Deref(nil, def)
   101  	if out != def {
   102  		t.Errorf("expected %d, got %d", def, out)
   103  	}
   104  }
   105  
   106  func TestEqual(t *testing.T) {
   107  	type T int
   108  
   109  	if !ptr.Equal[T](nil, nil) {
   110  		t.Errorf("expected true (nil == nil)")
   111  	}
   112  	if !ptr.Equal(ptr.To(T(123)), ptr.To(T(123))) {
   113  		t.Errorf("expected true (val == val)")
   114  	}
   115  	if ptr.Equal(nil, ptr.To(T(123))) {
   116  		t.Errorf("expected false (nil != val)")
   117  	}
   118  	if ptr.Equal(ptr.To(T(123)), nil) {
   119  		t.Errorf("expected false (val != nil)")
   120  	}
   121  	if ptr.Equal(ptr.To(T(123)), ptr.To(T(456))) {
   122  		t.Errorf("expected false (val != val)")
   123  	}
   124  }
   125
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