/
forwardRef-test.internal.js
216 lines (180 loc) · 5.46 KB
/
forwardRef-test.internal.js
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
/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @emails react-core
*/
'use strict';
describe('forwardRef', () => {
let React;
let ReactFeatureFlags;
let ReactNoop;
beforeEach(() => {
jest.resetModules();
ReactFeatureFlags = require('shared/ReactFeatureFlags');
ReactFeatureFlags.debugRenderPhaseSideEffectsForStrictMode = false;
React = require('react');
ReactNoop = require('react-noop-renderer');
});
it('should work without a ref to be forwarded', () => {
class Child extends React.Component {
render() {
ReactNoop.yield(this.props.value);
return null;
}
}
function Wrapper(props) {
return <Child {...props} ref={props.forwardedRef} />;
}
const RefForwardingComponent = React.forwardRef((props, ref) => (
<Wrapper {...props} forwardedRef={ref} />
));
ReactNoop.render(<RefForwardingComponent value={123} />);
expect(ReactNoop.flush()).toEqual([123]);
});
it('should forward a ref for a single child', () => {
class Child extends React.Component {
render() {
ReactNoop.yield(this.props.value);
return null;
}
}
function Wrapper(props) {
return <Child {...props} ref={props.forwardedRef} />;
}
const RefForwardingComponent = React.forwardRef((props, ref) => (
<Wrapper {...props} forwardedRef={ref} />
));
const ref = React.createRef();
ReactNoop.render(<RefForwardingComponent ref={ref} value={123} />);
expect(ReactNoop.flush()).toEqual([123]);
expect(ref.current instanceof Child).toBe(true);
});
it('should forward a ref for multiple children', () => {
class Child extends React.Component {
render() {
ReactNoop.yield(this.props.value);
return null;
}
}
function Wrapper(props) {
return <Child {...props} ref={props.forwardedRef} />;
}
const RefForwardingComponent = React.forwardRef((props, ref) => (
<Wrapper {...props} forwardedRef={ref} />
));
const ref = React.createRef();
ReactNoop.render(
<div>
<div />
<RefForwardingComponent ref={ref} value={123} />
<div />
</div>,
);
expect(ReactNoop.flush()).toEqual([123]);
expect(ref.current instanceof Child).toBe(true);
});
it('should maintain child instance and ref through updates', () => {
class Child extends React.Component {
constructor(props) {
super(props);
}
render() {
ReactNoop.yield(this.props.value);
return null;
}
}
function Wrapper(props) {
return <Child {...props} ref={props.forwardedRef} />;
}
const RefForwardingComponent = React.forwardRef((props, ref) => (
<Wrapper {...props} forwardedRef={ref} />
));
let setRefCount = 0;
let ref;
const setRef = r => {
setRefCount++;
ref = r;
};
ReactNoop.render(<RefForwardingComponent ref={setRef} value={123} />);
expect(ReactNoop.flush()).toEqual([123]);
expect(ref instanceof Child).toBe(true);
expect(setRefCount).toBe(1);
ReactNoop.render(<RefForwardingComponent ref={setRef} value={456} />);
expect(ReactNoop.flush()).toEqual([456]);
expect(ref instanceof Child).toBe(true);
expect(setRefCount).toBe(1);
});
it('should not break lifecycle error handling', () => {
class ErrorBoundary extends React.Component {
state = {error: null};
componentDidCatch(error) {
ReactNoop.yield('ErrorBoundary.componentDidCatch');
this.setState({error});
}
render() {
if (this.state.error) {
ReactNoop.yield('ErrorBoundary.render: catch');
return null;
}
ReactNoop.yield('ErrorBoundary.render: try');
return this.props.children;
}
}
class BadRender extends React.Component {
render() {
ReactNoop.yield('BadRender throw');
throw new Error('oops!');
}
}
function Wrapper(props) {
ReactNoop.yield('Wrapper');
return <BadRender {...props} ref={props.forwardedRef} />;
}
const RefForwardingComponent = React.forwardRef((props, ref) => (
<Wrapper {...props} forwardedRef={ref} />
));
const ref = React.createRef();
ReactNoop.render(
<ErrorBoundary>
<RefForwardingComponent ref={ref} />
</ErrorBoundary>,
);
expect(ReactNoop.flush()).toEqual([
'ErrorBoundary.render: try',
'Wrapper',
'BadRender throw',
'ErrorBoundary.componentDidCatch',
'ErrorBoundary.render: catch',
]);
expect(ref.current).toBe(null);
});
it('should not re-run the render callback on a deep setState', () => {
let inst;
class Inner extends React.Component {
render() {
ReactNoop.yield('Inner');
inst = this;
return <div ref={this.props.forwardedRef} />;
}
}
function Middle(props) {
ReactNoop.yield('Middle');
return <Inner {...props} />;
}
const Forward = React.forwardRef((props, ref) => {
ReactNoop.yield('Forward');
return <Middle {...props} forwardedRef={ref} />;
});
function App() {
ReactNoop.yield('App');
return <Forward />;
}
ReactNoop.render(<App />);
expect(ReactNoop.flush()).toEqual(['App', 'Forward', 'Middle', 'Inner']);
inst.setState({});
expect(ReactNoop.flush()).toEqual(['Inner']);
});
});