1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// Copyright 2018 Google LLC
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fs
import (
"testing"
)
func TestDirentCache(t *testing.T) {
const maxSize = 5
c := NewDirentCache(maxSize)
// Size starts at 0.
if got, want := c.Size(), uint64(0); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
// Create a Dirent d.
d := NewNegativeDirent("")
// c does not contain d.
if got, want := c.contains(d), false; got != want {
t.Errorf("c.contains(d) got %v want %v", got, want)
}
// Add d to the cache.
c.Add(d)
// Size is now 1.
if got, want := c.Size(), uint64(1); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
// c contains d.
if got, want := c.contains(d), true; got != want {
t.Errorf("c.contains(d) got %v want %v", got, want)
}
// Add maxSize-1 more elements. d should be oldest element.
for i := 0; i < maxSize-1; i++ {
c.Add(NewNegativeDirent(""))
}
// Size is maxSize.
if got, want := c.Size(), uint64(maxSize); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
// c contains d.
if got, want := c.contains(d), true; got != want {
t.Errorf("c.contains(d) got %v want %v", got, want)
}
// "Bump" d to the front by re-adding it.
c.Add(d)
// Size is maxSize.
if got, want := c.Size(), uint64(maxSize); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
// c contains d.
if got, want := c.contains(d), true; got != want {
t.Errorf("c.contains(d) got %v want %v", got, want)
}
// Add maxSize-1 more elements. d should again be oldest element.
for i := 0; i < maxSize-1; i++ {
c.Add(NewNegativeDirent(""))
}
// Size is maxSize.
if got, want := c.Size(), uint64(maxSize); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
// c contains d.
if got, want := c.contains(d), true; got != want {
t.Errorf("c.contains(d) got %v want %v", got, want)
}
// Add one more element, which will bump d from the cache.
c.Add(NewNegativeDirent(""))
// Size is maxSize.
if got, want := c.Size(), uint64(maxSize); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
// c does not contain d.
if got, want := c.contains(d), false; got != want {
t.Errorf("c.contains(d) got %v want %v", got, want)
}
// Invalidating causes size to be 0 and list to be empty.
c.Invalidate()
if got, want := c.Size(), uint64(0); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
if got, want := c.list.Empty(), true; got != want {
t.Errorf("c.list.Empty() got %v, want %v", got, want)
}
// Fill cache with maxSize dirents.
for i := 0; i < maxSize; i++ {
c.Add(NewNegativeDirent(""))
}
}
// TestNilDirentCache tests that a nil cache supports all cache operations, but
// treats them as noop.
func TestNilDirentCache(t *testing.T) {
// Create a nil cache.
var c *DirentCache
// Size is zero.
if got, want := c.Size(), uint64(0); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
// Call Add.
c.Add(NewNegativeDirent(""))
// Size is zero.
if got, want := c.Size(), uint64(0); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
// Call Remove.
c.Remove(NewNegativeDirent(""))
// Size is zero.
if got, want := c.Size(), uint64(0); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
// Call Invalidate.
c.Invalidate()
// Size is zero.
if got, want := c.Size(), uint64(0); got != want {
t.Errorf("c.Size() got %v, want %v", got, want)
}
}
|
