ExpressionChangedAfterItHasBeenCheckedError when testing Angular Material Table
Using Angular 7 I added material table to my application with ng generate @angular/material:table test-table
Inside the generated template there is a paginator:
<mat-paginator #paginator
[length]="dataSource.data.length"
[pageIndex]="0"
[pageSize]="50"
[pageSizeOptions]="[25, 50, 100, 250]">
</mat-paginator>
On init the datasource is changed:
ngOnInit() {
this.dataSource = new ItemsTableDataSource(
this.paginator,
this.sort,
this.route.paramMap,
this.afs
);
}
When trying to compile the component on Karma expect(component).toBeTruthy(); I'm getting the following error
Error: ExpressionChangedAfterItHasBeenCheckedError: Expression has
changed after it was checked. Previous value: 'length: 0'. Current
value: 'length: 1'.
How can I solve this issue?
angular karma-jasmine angular-material2 angular7
edited Nov 29 '18 at 12:39
Goncalo Peres
1,4501519
asked Nov 24 '18 at 6:31
Roni HacohenRoni Hacohen
6319
add a comment |
Using Angular 7 I added material table to my application with ng generate @angular/material:table test-table
Inside the generated template there is a paginator:
<mat-paginator #paginator
[length]="dataSource.data.length"
[pageIndex]="0"
[pageSize]="50"
[pageSizeOptions]="[25, 50, 100, 250]">
</mat-paginator>
On init the datasource is changed:
ngOnInit() {
this.dataSource = new ItemsTableDataSource(
this.paginator,
this.sort,
this.route.paramMap,
this.afs
);
}
When trying to compile the component on Karma expect(component).toBeTruthy(); I'm getting the following error
Error: ExpressionChangedAfterItHasBeenCheckedError: Expression has
changed after it was checked. Previous value: 'length: 0'. Current
value: 'length: 1'.
How can I solve this issue?
angular karma-jasmine angular-material2 angular7
edited Nov 29 '18 at 12:39
Goncalo Peres
1,4501519
asked Nov 24 '18 at 6:31
Roni HacohenRoni Hacohen
6319
Please update your post with example code of the unit-test
– Lucho
Nov 25 '18 at 9:06
@Lucho It's just a basicexpect(component).toBeTruthy()test as I mentioned in the post.
– Roni Hacohen
Nov 25 '18 at 20:02
It's just not that, the config(Testbed) setup has a role aswell
– Lucho
Nov 25 '18 at 21:01
Here is my spec file: github.com/ronihcohen/fin-app-ng/blob/…
– Roni Hacohen
Nov 26 '18 at 4:39
Have a look at this post: stackoverflow.com/a/53015635/9226213. It might be related.
– G. Tranter
Nov 27 '18 at 16:37
add a comment |
Using Angular 7 I added material table to my application with ng generate @angular/material:table test-table
Inside the generated template there is a paginator:
<mat-paginator #paginator
[length]="dataSource.data.length"
[pageIndex]="0"
[pageSize]="50"
[pageSizeOptions]="[25, 50, 100, 250]">
</mat-paginator>
On init the datasource is changed:
ngOnInit() {
this.dataSource = new ItemsTableDataSource(
this.paginator,
this.sort,
this.route.paramMap,
this.afs
);
}
When trying to compile the component on Karma expect(component).toBeTruthy(); I'm getting the following error
Error: ExpressionChangedAfterItHasBeenCheckedError: Expression has
changed after it was checked. Previous value: 'length: 0'. Current
value: 'length: 1'.
How can I solve this issue?
angular karma-jasmine angular-material2 angular7
edited Nov 29 '18 at 12:39
Goncalo Peres
1,4501519
asked Nov 24 '18 at 6:31
Roni HacohenRoni Hacohen
6319
Using Angular 7 I added material table to my application with ng generate @angular/material:table test-table
Inside the generated template there is a paginator:
<mat-paginator #paginator
[length]="dataSource.data.length"
[pageIndex]="0"
[pageSize]="50"
[pageSizeOptions]="[25, 50, 100, 250]">
</mat-paginator>
On init the datasource is changed:
ngOnInit() {
this.dataSource = new ItemsTableDataSource(
this.paginator,
this.sort,
this.route.paramMap,
this.afs
);
}
When trying to compile the component on Karma expect(component).toBeTruthy(); I'm getting the following error
Error: ExpressionChangedAfterItHasBeenCheckedError: Expression has
changed after it was checked. Previous value: 'length: 0'. Current
value: 'length: 1'.
How can I solve this issue?
angular karma-jasmine angular-material2 angular7
angular karma-jasmine angular-material2 angular7
edited Nov 29 '18 at 12:39
Goncalo Peres
1,4501519
asked Nov 24 '18 at 6:31
Roni HacohenRoni Hacohen
6319
edited Nov 29 '18 at 12:39
Goncalo Peres
1,4501519
asked Nov 24 '18 at 6:31
Roni HacohenRoni Hacohen
6319
edited Nov 29 '18 at 12:39
Goncalo Peres
1,4501519
edited Nov 29 '18 at 12:39
Goncalo Peres
1,4501519
edited Nov 29 '18 at 12:39
Goncalo Peres
1,4501519
1,4501519
asked Nov 24 '18 at 6:31
Roni HacohenRoni Hacohen
6319
asked Nov 24 '18 at 6:31
Roni HacohenRoni Hacohen
6319
asked Nov 24 '18 at 6:31
Roni HacohenRoni Hacohen
6319
6319
Please update your post with example code of the unit-test
– Lucho
Nov 25 '18 at 9:06
@Lucho It's just a basicexpect(component).toBeTruthy()test as I mentioned in the post.
– Roni Hacohen
Nov 25 '18 at 20:02
It's just not that, the config(Testbed) setup has a role aswell
– Lucho
Nov 25 '18 at 21:01
Here is my spec file: github.com/ronihcohen/fin-app-ng/blob/…
– Roni Hacohen
Nov 26 '18 at 4:39
Have a look at this post: stackoverflow.com/a/53015635/9226213. It might be related.
– G. Tranter
Nov 27 '18 at 16:37
add a comment |
Please update your post with example code of the unit-test
– Lucho
Nov 25 '18 at 9:06
@Lucho It's just a basicexpect(component).toBeTruthy()test as I mentioned in the post.
– Roni Hacohen
Nov 25 '18 at 20:02
It's just not that, the config(Testbed) setup has a role aswell
– Lucho
Nov 25 '18 at 21:01
Here is my spec file: github.com/ronihcohen/fin-app-ng/blob/…
– Roni Hacohen
Nov 26 '18 at 4:39
Have a look at this post: stackoverflow.com/a/53015635/9226213. It might be related.
– G. Tranter
Nov 27 '18 at 16:37
Please update your post with example code of the unit-test
– Lucho
Nov 25 '18 at 9:06
Please update your post with example code of the unit-test
– Lucho
Nov 25 '18 at 9:06
@Lucho It's just a basic
expect(component).toBeTruthy() test as I mentioned in the post.– Roni Hacohen
Nov 25 '18 at 20:02
@Lucho It's just a basic
expect(component).toBeTruthy() test as I mentioned in the post.– Roni Hacohen
Nov 25 '18 at 20:02
It's just not that, the config(Testbed) setup has a role aswell
– Lucho
Nov 25 '18 at 21:01
It's just not that, the config(Testbed) setup has a role aswell
– Lucho
Nov 25 '18 at 21:01
Here is my spec file: github.com/ronihcohen/fin-app-ng/blob/…
– Roni Hacohen
Nov 26 '18 at 4:39
Here is my spec file: github.com/ronihcohen/fin-app-ng/blob/…
– Roni Hacohen
Nov 26 '18 at 4:39
Have a look at this post: stackoverflow.com/a/53015635/9226213. It might be related.
– G. Tranter
Nov 27 '18 at 16:37
Have a look at this post: stackoverflow.com/a/53015635/9226213. It might be related.
– G. Tranter
Nov 27 '18 at 16:37
add a comment |
1 Answer
1
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oldest
votes
Not sure how kosher it is but in my case I simply removed the 'fixture.detectChanges()' call from the spec file. I am working with an A6 ReactiveForm, setting some initial dummy date range values in the test. The form works fine but the test failed with your error.
answered Dec 7 '18 at 21:54
EddieBabyEddieBaby
593
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Not sure how kosher it is but in my case I simply removed the 'fixture.detectChanges()' call from the spec file. I am working with an A6 ReactiveForm, setting some initial dummy date range values in the test. The form works fine but the test failed with your error.
answered Dec 7 '18 at 21:54
EddieBabyEddieBaby
593
add a comment |
Not sure how kosher it is but in my case I simply removed the 'fixture.detectChanges()' call from the spec file. I am working with an A6 ReactiveForm, setting some initial dummy date range values in the test. The form works fine but the test failed with your error.
answered Dec 7 '18 at 21:54
EddieBabyEddieBaby
593
add a comment |
Not sure how kosher it is but in my case I simply removed the 'fixture.detectChanges()' call from the spec file. I am working with an A6 ReactiveForm, setting some initial dummy date range values in the test. The form works fine but the test failed with your error.
answered Dec 7 '18 at 21:54
EddieBabyEddieBaby
593
Not sure how kosher it is but in my case I simply removed the 'fixture.detectChanges()' call from the spec file. I am working with an A6 ReactiveForm, setting some initial dummy date range values in the test. The form works fine but the test failed with your error.
answered Dec 7 '18 at 21:54
EddieBabyEddieBaby
593
answered Dec 7 '18 at 21:54
EddieBabyEddieBaby
593
answered Dec 7 '18 at 21:54
EddieBabyEddieBaby
593
answered Dec 7 '18 at 21:54
EddieBabyEddieBaby
593
593
add a comment |
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Please update your post with example code of the unit-test
– Lucho
Nov 25 '18 at 9:06
@Lucho It's just a basic
expect(component).toBeTruthy()test as I mentioned in the post.– Roni Hacohen
Nov 25 '18 at 20:02
It's just not that, the config(Testbed) setup has a role aswell
– Lucho
Nov 25 '18 at 21:01
Here is my spec file: github.com/ronihcohen/fin-app-ng/blob/…
– Roni Hacohen
Nov 26 '18 at 4:39
Have a look at this post: stackoverflow.com/a/53015635/9226213. It might be related.
– G. Tranter
Nov 27 '18 at 16:37