Form controls named mat-select lack a value accessor

As I work on creating unit tests using jasmine and karma for my angular 6 application to validate the validity of a formGroup field, I encountered a challenge with the mat-select control. While running the test case, Karma throws an error stating 

Error: No value accessor for form control with name: 'importId'
. However, the component functions correctly as expected.

https://i.sstatic.net/loCIJ.jpg

Here is the code snippet of my component:

 // Component code here

This is how my HTML template looks like:

 // HTML template code here

Lastly, this is my unit test script:

 // Unit test script here

I'm currently stuck and can't figure out what might be missing, any suggestions or insights would be greatly appreciated.

angulartypescriptunit-testingangular-materialkarma-jasmine

Answer №1

The issue lies in your testing module where you have forgotten to import the necessary material modules.

As a result, elements like mat-form-field, mat-select, etc. are unrecognized by Angular because you have instructed it to ignore them using NO_ERRORS_SCHEMA.

Answer №2

Forgetting to include

import {MatSelectModule} from '@angular/material/select';

within the module was my issue.

Make sure you import it for it to function correctly.

Answer №3

It appears that some crucial modules are missing from your setup, causing the Angular compiler to be unaware of them. Ensure to include at least the following (and possibly more) in your imports:

imports: [ReactiveFormsModule, FormsModule,
  BrowserModule,
  BrowserAnimationsModule,
  MatSelectModule,
  MatOptionModule,
  MatInputModule
],

Additionally, consider using

schemas: [CUSTOM_ELEMENTS_SCHEMA],

to assist the compiler in recognizing non-HTML elements.

By implementing these changes, you can eliminate the need for NO_ERRORS_SCHEMA, which is generally unnecessary in simpler scenarios.

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