Using sinon how do I stub or fake the property of a callback
0
Using sinon how do I stub/fake a return value for this.lastID in the db.run function.
module.exports.insert = async(request) => {
//unimportant code
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
I can fake the callback using this code:
describe('insert', () => {
beforeEach(() => {
this.insert = sinon.stub(db, 'run')
.callsArgWith(2, null)
})
afterEach(() => {
this.insert.restore()
})
test('add product to the database', async(done) => {
expect.assertions(1)
const id = await productDb.insert(testProductAlt)
expect(isNaN(id)).toBe(false)
expect(id).toBe('1')
done()
})
})
But it will fail as this.lastID is undefined. How do I overcome this?
Thanks!
javascript node.js jestjs sinon
asked Nov 23 '18 at 19:51
OultimoCoderOultimoCoder
9119
add a comment |
0
Using sinon how do I stub/fake a return value for this.lastID in the db.run function.
module.exports.insert = async(request) => {
//unimportant code
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
I can fake the callback using this code:
describe('insert', () => {
beforeEach(() => {
this.insert = sinon.stub(db, 'run')
.callsArgWith(2, null)
})
afterEach(() => {
this.insert.restore()
})
test('add product to the database', async(done) => {
expect.assertions(1)
const id = await productDb.insert(testProductAlt)
expect(isNaN(id)).toBe(false)
expect(id).toBe('1')
done()
})
})
But it will fail as this.lastID is undefined. How do I overcome this?
Thanks!
javascript node.js jestjs sinon
asked Nov 23 '18 at 19:51
OultimoCoderOultimoCoder
9119
add a comment |
0
0
0
Using sinon how do I stub/fake a return value for this.lastID in the db.run function.
module.exports.insert = async(request) => {
//unimportant code
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
I can fake the callback using this code:
describe('insert', () => {
beforeEach(() => {
this.insert = sinon.stub(db, 'run')
.callsArgWith(2, null)
})
afterEach(() => {
this.insert.restore()
})
test('add product to the database', async(done) => {
expect.assertions(1)
const id = await productDb.insert(testProductAlt)
expect(isNaN(id)).toBe(false)
expect(id).toBe('1')
done()
})
})
But it will fail as this.lastID is undefined. How do I overcome this?
Thanks!
javascript node.js jestjs sinon
asked Nov 23 '18 at 19:51
OultimoCoderOultimoCoder
9119
Using sinon how do I stub/fake a return value for this.lastID in the db.run function.
module.exports.insert = async(request) => {
//unimportant code
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
I can fake the callback using this code:
describe('insert', () => {
beforeEach(() => {
this.insert = sinon.stub(db, 'run')
.callsArgWith(2, null)
})
afterEach(() => {
this.insert.restore()
})
test('add product to the database', async(done) => {
expect.assertions(1)
const id = await productDb.insert(testProductAlt)
expect(isNaN(id)).toBe(false)
expect(id).toBe('1')
done()
})
})
But it will fail as this.lastID is undefined. How do I overcome this?
Thanks!
javascript node.js jestjs sinon
javascript node.js jestjs sinon
asked Nov 23 '18 at 19:51
OultimoCoderOultimoCoder
9119
asked Nov 23 '18 at 19:51
OultimoCoderOultimoCoder
9119
asked Nov 23 '18 at 19:51
OultimoCoderOultimoCoder
9119
asked Nov 23 '18 at 19:51
OultimoCoderOultimoCoder
9119
asked Nov 23 '18 at 19:51
OultimoCoderOultimoCoder
9119
9119
add a comment |
add a comment |
1 Answer
1
active
oldest
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1
You can use stub.callsArgOn() to pass in a context value that will used as this in the callback. You would stub it with something like:
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2, {lastID: 'testVal'})
Here's an example with some made up functions:
let db ={
run(sql, params, cb){cb()}
}
let insert = async(request) => {
let sql, params
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2,{lastID: 'testVal'})
// should log our test value
insert()
.then(console.log)
.catch((e) =>console.log("error", "error: ", e))<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>answered Nov 23 '18 at 20:11
Mark MeyerMark Meyer
37.1k33059
1
Thank you! Very helpful. I tried to pass in the value of lastID but I was use the .callsArgWith function, this makes more sense.
– OultimoCoder
Nov 23 '18 at 20:34
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
You can use stub.callsArgOn() to pass in a context value that will used as this in the callback. You would stub it with something like:
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2, {lastID: 'testVal'})
Here's an example with some made up functions:
let db ={
run(sql, params, cb){cb()}
}
let insert = async(request) => {
let sql, params
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2,{lastID: 'testVal'})
// should log our test value
insert()
.then(console.log)
.catch((e) =>console.log("error", "error: ", e))<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>answered Nov 23 '18 at 20:11
Mark MeyerMark Meyer
37.1k33059
1
Thank you! Very helpful. I tried to pass in the value of lastID but I was use the .callsArgWith function, this makes more sense.
– OultimoCoder
Nov 23 '18 at 20:34
add a comment |
1
You can use stub.callsArgOn() to pass in a context value that will used as this in the callback. You would stub it with something like:
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2, {lastID: 'testVal'})
Here's an example with some made up functions:
let db ={
run(sql, params, cb){cb()}
}
let insert = async(request) => {
let sql, params
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2,{lastID: 'testVal'})
// should log our test value
insert()
.then(console.log)
.catch((e) =>console.log("error", "error: ", e))<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>answered Nov 23 '18 at 20:11
Mark MeyerMark Meyer
37.1k33059
1
Thank you! Very helpful. I tried to pass in the value of lastID but I was use the .callsArgWith function, this makes more sense.
– OultimoCoder
Nov 23 '18 at 20:34
add a comment |
1
1
1
You can use stub.callsArgOn() to pass in a context value that will used as this in the callback. You would stub it with something like:
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2, {lastID: 'testVal'})
Here's an example with some made up functions:
let db ={
run(sql, params, cb){cb()}
}
let insert = async(request) => {
let sql, params
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2,{lastID: 'testVal'})
// should log our test value
insert()
.then(console.log)
.catch((e) =>console.log("error", "error: ", e))<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>answered Nov 23 '18 at 20:11
Mark MeyerMark Meyer
37.1k33059
You can use stub.callsArgOn() to pass in a context value that will used as this in the callback. You would stub it with something like:
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2, {lastID: 'testVal'})
Here's an example with some made up functions:
let db ={
run(sql, params, cb){cb()}
}
let insert = async(request) => {
let sql, params
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2,{lastID: 'testVal'})
// should log our test value
insert()
.then(console.log)
.catch((e) =>console.log("error", "error: ", e))<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>let db ={
run(sql, params, cb){cb()}
}
let insert = async(request) => {
let sql, params
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2,{lastID: 'testVal'})
// should log our test value
insert()
.then(console.log)
.catch((e) =>console.log("error", "error: ", e))<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>let db ={
run(sql, params, cb){cb()}
}
let insert = async(request) => {
let sql, params
return new Promise((resolve, reject) => {
db.run(sql, params, function(err) {
if (err)
reject(err)
else
resolve(this.lastID)
})
})
}
let insert_stubb = sinon.stub(db, 'run')
.callsArgOn(2,{lastID: 'testVal'})
// should log our test value
insert()
.then(console.log)
.catch((e) =>console.log("error", "error: ", e))<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>answered Nov 23 '18 at 20:11
Mark MeyerMark Meyer
37.1k33059
answered Nov 23 '18 at 20:11
Mark MeyerMark Meyer
37.1k33059
answered Nov 23 '18 at 20:11
Mark MeyerMark Meyer
37.1k33059
answered Nov 23 '18 at 20:11
Mark MeyerMark Meyer
37.1k33059
37.1k33059
1
Thank you! Very helpful. I tried to pass in the value of lastID but I was use the .callsArgWith function, this makes more sense.
– OultimoCoder
Nov 23 '18 at 20:34
add a comment |
1
Thank you! Very helpful. I tried to pass in the value of lastID but I was use the .callsArgWith function, this makes more sense.
– OultimoCoder
Nov 23 '18 at 20:34
1
1
Thank you! Very helpful. I tried to pass in the value of lastID but I was use the .callsArgWith function, this makes more sense.
– OultimoCoder
Nov 23 '18 at 20:34
Thank you! Very helpful. I tried to pass in the value of lastID but I was use the .callsArgWith function, this makes more sense.
– OultimoCoder
Nov 23 '18 at 20:34
add a comment |
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