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体验新版 GitCode,发现更多精彩内容 >>
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19e5609c
编写于
2月 23, 2021
作者:
J
Joe Previte
提交者:
GitHub
2月 23, 2021
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Merge pull request #2715 from cdr/add-tests-emitter
feat(testing): add unit tests for emitter
上级
74d26523
325a1d81
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1
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1 changed file
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85 addition
and
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+85
-0
test/emitter.test.ts
test/emitter.test.ts
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未找到文件。
test/emitter.test.ts
0 → 100644
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19e5609c
// Note: we need to import logger from the root
// because this is the logger used in logError in ../src/common/util
import
{
logger
}
from
"
../node_modules/@coder/logger
"
import
{
Emitter
}
from
"
../src/common/emitter
"
describe
(
"
Emitter
"
,
()
=>
{
let
spy
:
jest
.
SpyInstance
beforeEach
(()
=>
{
spy
=
jest
.
spyOn
(
logger
,
"
error
"
)
})
afterEach
(()
=>
{
jest
.
clearAllMocks
()
})
afterAll
(()
=>
{
jest
.
restoreAllMocks
()
})
it
(
"
should run the correct callbacks
"
,
async
()
=>
{
const
HELLO_WORLD
=
"
HELLO_WORLD
"
const
GOODBYE_WORLD
=
"
GOODBYE_WORLD
"
const
mockCallback
=
jest
.
fn
(()
=>
"
Mock function called
"
)
const
mockSecondCallback
=
jest
.
fn
(()
=>
undefined
)
const
emitter
=
new
Emitter
<
{
event
:
string
;
callback
:
()
=>
void
}
>
()
const
onHelloWorld
=
({
event
,
callback
}:
{
event
:
string
;
callback
:
()
=>
void
}):
void
=>
{
if
(
event
===
HELLO_WORLD
)
{
callback
()
}
}
const
onGoodbyeWorld
=
({
event
,
callback
}:
{
event
:
string
;
callback
:
()
=>
void
}):
void
=>
{
if
(
event
===
GOODBYE_WORLD
)
{
callback
()
}
}
// Register the onHelloWorld listener
// and the onGoodbyeWorld
emitter
.
event
(
onHelloWorld
)
emitter
.
event
(
onGoodbyeWorld
)
await
emitter
.
emit
({
event
:
HELLO_WORLD
,
callback
:
mockCallback
})
// Double-check that our callback is called only once
expect
(
mockCallback
).
toHaveBeenCalled
()
expect
(
mockCallback
).
toHaveBeenCalledTimes
(
1
)
await
emitter
.
emit
({
event
:
GOODBYE_WORLD
,
callback
:
mockSecondCallback
})
// Check that it works with multiple listeners
expect
(
mockSecondCallback
).
toHaveBeenCalled
()
expect
(
mockSecondCallback
).
toHaveBeenCalledTimes
(
1
)
// Dispose of all the listeners
emitter
.
dispose
()
})
it
(
"
should log an error if something goes wrong
"
,
async
()
=>
{
const
HELLO_WORLD
=
"
HELLO_WORLD
"
const
mockCallback
=
jest
.
fn
(()
=>
"
Mock function called
"
)
const
message
=
"
You don't have access to that folder.
"
const
emitter
=
new
Emitter
<
{
event
:
string
;
callback
:
()
=>
void
}
>
()
const
onHelloWorld
=
({
event
,
callback
}:
{
event
:
string
;
callback
:
()
=>
void
}):
void
=>
{
if
(
event
===
HELLO_WORLD
)
{
callback
()
throw
new
Error
(
message
)
}
}
emitter
.
event
(
onHelloWorld
)
await
emitter
.
emit
({
event
:
HELLO_WORLD
,
callback
:
mockCallback
})
// Check that error was called
expect
(
spy
).
toHaveBeenCalled
()
expect
(
spy
).
toHaveBeenCalledTimes
(
1
)
expect
(
spy
).
toHaveBeenCalledWith
(
message
)
})
})
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