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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
import * as UserApi from '~/api/user_api';
import UsersCache from '~/lib/utils/users_cache';
describe('UsersCache', () => {
const dummyUsername = 'win';
const dummyUserId = 123;
const dummyUser = {
name: 'has a farm',
username: 'farmer',
};
const dummyUserStatus = 'my status';
beforeEach(() => {
UsersCache.internalStorage = {};
});
describe('get', () => {
it('returns undefined for empty cache', () => {
expect(UsersCache.internalStorage).toEqual({});
const user = UsersCache.get(dummyUsername);
expect(user).toBe(undefined);
});
it('returns undefined for missing user', () => {
UsersCache.internalStorage['no body'] = 'no data';
const user = UsersCache.get(dummyUsername);
expect(user).toBe(undefined);
});
it('returns matching user', () => {
UsersCache.internalStorage[dummyUsername] = dummyUser;
const user = UsersCache.get(dummyUsername);
expect(user).toBe(dummyUser);
});
});
describe('hasData', () => {
it('returns false for empty cache', () => {
expect(UsersCache.internalStorage).toEqual({});
expect(UsersCache.hasData(dummyUsername)).toBe(false);
});
it('returns false for missing user', () => {
UsersCache.internalStorage['no body'] = 'no data';
expect(UsersCache.hasData(dummyUsername)).toBe(false);
});
it('returns true for matching user', () => {
UsersCache.internalStorage[dummyUsername] = dummyUser;
expect(UsersCache.hasData(dummyUsername)).toBe(true);
});
});
describe('remove', () => {
it('does nothing if cache is empty', () => {
expect(UsersCache.internalStorage).toEqual({});
UsersCache.remove(dummyUsername);
expect(UsersCache.internalStorage).toEqual({});
});
it('does nothing if cache contains no matching data', () => {
UsersCache.internalStorage['no body'] = 'no data';
UsersCache.remove(dummyUsername);
expect(UsersCache.internalStorage['no body']).toBe('no data');
});
it('removes matching data', () => {
UsersCache.internalStorage[dummyUsername] = dummyUser;
UsersCache.remove(dummyUsername);
expect(UsersCache.internalStorage).toEqual({});
});
});
describe('retrieve', () => {
let apiSpy;
beforeEach(() => {
jest
.spyOn(UserApi, 'getUsers')
.mockImplementation((query, options) => apiSpy(query, options));
});
it('stores and returns data from API call if cache is empty', async () => {
apiSpy = (query, options) => {
expect(query).toBe('');
expect(options).toEqual({
username: dummyUsername,
});
return Promise.resolve({
data: [dummyUser],
});
};
const user = await UsersCache.retrieve(dummyUsername);
expect(user).toBe(dummyUser);
expect(UsersCache.internalStorage[dummyUsername]).toBe(dummyUser);
});
it('returns undefined if Ajax call fails and cache is empty', async () => {
const dummyError = new Error('server exploded');
apiSpy = (query, options) => {
expect(query).toBe('');
expect(options).toEqual({
username: dummyUsername,
});
return Promise.reject(dummyError);
};
await expect(UsersCache.retrieve(dummyUsername)).rejects.toEqual(dummyError);
});
it('makes no Ajax call if matching data exists', async () => {
UsersCache.internalStorage[dummyUsername] = dummyUser;
apiSpy = () => {
throw new Error('expected no Ajax call!');
};
const user = await UsersCache.retrieve(dummyUsername);
expect(user).toBe(dummyUser);
});
});
describe('retrieveById', () => {
let apiSpy;
beforeEach(() => {
jest.spyOn(UserApi, 'getUser').mockImplementation((id) => apiSpy(id));
});
it('stores and returns data from API call if cache is empty', async () => {
apiSpy = (id) => {
expect(id).toBe(dummyUserId);
return Promise.resolve({
data: dummyUser,
});
};
const user = await UsersCache.retrieveById(dummyUserId);
expect(user).toBe(dummyUser);
expect(UsersCache.internalStorage[dummyUserId]).toBe(dummyUser);
});
it('returns undefined if Ajax call fails and cache is empty', async () => {
const dummyError = new Error('server exploded');
apiSpy = (id) => {
expect(id).toBe(dummyUserId);
return Promise.reject(dummyError);
};
await expect(UsersCache.retrieveById(dummyUserId)).rejects.toEqual(dummyError);
});
it('makes no Ajax call if matching data exists', async () => {
UsersCache.internalStorage[dummyUserId] = dummyUser;
apiSpy = () => {
throw new Error('expected no Ajax call!');
};
const user = await UsersCache.retrieveById(dummyUserId);
expect(user).toBe(dummyUser);
});
});
describe('retrieveStatusById', () => {
let apiSpy;
beforeEach(() => {
jest.spyOn(UserApi, 'getUserStatus').mockImplementation((id) => apiSpy(id));
});
it('stores and returns data from API call if cache is empty', async () => {
apiSpy = (id) => {
expect(id).toBe(dummyUserId);
return Promise.resolve({
data: dummyUserStatus,
});
};
const userStatus = await UsersCache.retrieveStatusById(dummyUserId);
expect(userStatus).toBe(dummyUserStatus);
expect(UsersCache.internalStorage[dummyUserId].status).toBe(dummyUserStatus);
});
it('returns undefined if Ajax call fails and cache is empty', async () => {
const dummyError = new Error('server exploded');
apiSpy = (id) => {
expect(id).toBe(dummyUserId);
return Promise.reject(dummyError);
};
await expect(UsersCache.retrieveStatusById(dummyUserId)).rejects.toEqual(dummyError);
});
it('makes no Ajax call if matching data exists', async () => {
UsersCache.internalStorage[dummyUserId] = {
status: dummyUserStatus,
};
apiSpy = () => {
throw new Error('expected no Ajax call!');
};
const userStatus = await UsersCache.retrieveStatusById(dummyUserId);
expect(userStatus).toBe(dummyUserStatus);
});
});
});
|
