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1

I have a simple component class as follows:

import Component from '@angular/core';
 import ControlService from '../services/control-service';

 @Component(
 templateUrl: './control-bar.component.html',
 styleUrls: ['./control-bar.component.less']
 )
 export class ControlBarComponent 
 get context(): any return this.controls.context; 
 constructor(private controls: ControlService) 
 is(contextName) 
 return this.context.constructor.name == contextName;
 
 

The problem arises when I try to write a unit test for the given code. I get the following error:

TypeError: Cannot read property 'constructor' of undefined
at ControlBarComponent../ src / app / courses / control
- bar.component.ts.ControlBarComponent.is(http://localhost:9876/
_karma_webpack_/webpack:/src/app/courses/control-bar.component.ts:12:33)
at Object.eval[as updateDirectives]
(ng:///DynamicTestModule/ControlBarComponent.ngfactory.js:111:25)

After playing around tod and trying find an answer I try the following code which no longer throws an error.

// Same except for the following line 
context = () => this.controls.context;
// replaces 
get context(): any return this.controls.context; 

So are there any drawbacks to this solution? And if so, when should I use these two code constructs?

angular typescript testing karma-jasmine

share|improve this question

edited Mar 7 at 5:34

TheParam

3,81011829

asked Mar 7 at 4:58

jwizejwize

3,08012236

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think that's workaround solution what you need here is create mock ControlService and pass when you get the instance of component
  
  – TheParam
  Mar 7 at 5:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what is the provider section in your spec file ? Share the code of spec files. The error is caused by this.context.constructor.name line as this.context is not defined
  
  – Shashank Vivek
  Mar 8 at 3:50
  
  

  
  
  
  

add a comment | 

1

I have a simple component class as follows:

import Component from '@angular/core';
 import ControlService from '../services/control-service';

 @Component(
 templateUrl: './control-bar.component.html',
 styleUrls: ['./control-bar.component.less']
 )
 export class ControlBarComponent 
 get context(): any return this.controls.context; 
 constructor(private controls: ControlService) 
 is(contextName) 
 return this.context.constructor.name == contextName;
 
 

The problem arises when I try to write a unit test for the given code. I get the following error:

TypeError: Cannot read property 'constructor' of undefined
at ControlBarComponent../ src / app / courses / control
- bar.component.ts.ControlBarComponent.is(http://localhost:9876/
_karma_webpack_/webpack:/src/app/courses/control-bar.component.ts:12:33)
at Object.eval[as updateDirectives]
(ng:///DynamicTestModule/ControlBarComponent.ngfactory.js:111:25)

After playing around tod and trying find an answer I try the following code which no longer throws an error.

// Same except for the following line 
context = () => this.controls.context;
// replaces 
get context(): any return this.controls.context; 

So are there any drawbacks to this solution? And if so, when should I use these two code constructs?

angular typescript testing karma-jasmine

share|improve this question

edited Mar 7 at 5:34

TheParam

3,81011829

asked Mar 7 at 4:58

jwizejwize

3,08012236

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think that's workaround solution what you need here is create mock ControlService and pass when you get the instance of component
  
  – TheParam
  Mar 7 at 5:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what is the provider section in your spec file ? Share the code of spec files. The error is caused by this.context.constructor.name line as this.context is not defined
  
  – Shashank Vivek
  Mar 8 at 3:50
  
  

  
  
  
  

add a comment | 

I have a simple component class as follows:

import Component from '@angular/core';
 import ControlService from '../services/control-service';

 @Component(
 templateUrl: './control-bar.component.html',
 styleUrls: ['./control-bar.component.less']
 )
 export class ControlBarComponent 
 get context(): any return this.controls.context; 
 constructor(private controls: ControlService) 
 is(contextName) 
 return this.context.constructor.name == contextName;
 
 

The problem arises when I try to write a unit test for the given code. I get the following error:

TypeError: Cannot read property 'constructor' of undefined
at ControlBarComponent../ src / app / courses / control
- bar.component.ts.ControlBarComponent.is(http://localhost:9876/
_karma_webpack_/webpack:/src/app/courses/control-bar.component.ts:12:33)
at Object.eval[as updateDirectives]
(ng:///DynamicTestModule/ControlBarComponent.ngfactory.js:111:25)

After playing around tod and trying find an answer I try the following code which no longer throws an error.

// Same except for the following line 
context = () => this.controls.context;
// replaces 
get context(): any return this.controls.context; 

So are there any drawbacks to this solution? And if so, when should I use these two code constructs?

angular typescript testing karma-jasmine

share|improve this question

edited Mar 7 at 5:34

TheParam

3,81011829

asked Mar 7 at 4:58

jwizejwize

3,08012236

import Component from '@angular/core';
 import ControlService from '../services/control-service';

 @Component(
 templateUrl: './control-bar.component.html',
 styleUrls: ['./control-bar.component.less']
 )
 export class ControlBarComponent 
 get context(): any return this.controls.context; 
 constructor(private controls: ControlService) 
 is(contextName) 
 return this.context.constructor.name == contextName;
 
 

// Same except for the following line 
context = () => this.controls.context;
// replaces 
get context(): any return this.controls.context; 

angular typescript testing karma-jasmine

angular typescript testing karma-jasmine

share|improve this question

edited Mar 7 at 5:34

TheParam

3,81011829

asked Mar 7 at 4:58

jwizejwize

3,08012236

share|improve this question

edited Mar 7 at 5:34

TheParam

3,81011829

asked Mar 7 at 4:58

jwizejwize

3,08012236

edited Mar 7 at 5:34

TheParam

3,81011829

edited Mar 7 at 5:34

TheParam

3,81011829

asked Mar 7 at 4:58

jwizejwize

3,08012236

asked Mar 7 at 4:58

jwizejwize

3,08012236