How to assign a value to a List<lightningComponentController.SelectOption>?

Question

I'm working on my lightning component page which uses a controller class and I have these lines of code in the controller class:

@AuraEnabled
public static List<SelectOption> typePicklistValue(){...}

which is a picklist dropdown in my lightning component.

Is it possible to assign a value on it in my test class? I tried doing this in the test class:

List<lightningComponentController.SelectOption> result = lightningComponentController.typePicklistValue(SelectOption:[label=Global, selected=true, value=Global]);

but it doesnt work. I'm just trying it anyway but is there a way to put a value on it? is it even possible?

Answer 1

You can update your typePicklistValue() method as follows. Use the Test.isRunningTest() method to include a branching logic, which verifies if the execution is invoked due to a test code execution and then populate the appropriate values as shown below. Refer the following article on Using SelectOption Class within Apex to understand further.

@AuraEnabled
public static List<SelectOption> typePicklistValue(){

    List<SelectOption> picklistOptions = new List<SelectOption>();

    //Test class specific branching logic to populate specific values in the context of a test code execution
    if(Test.isRunningTest()){

        picklistOptions.add(new SelectOption('value', 'label'));

    }
    else{

        //Your regular logic to populate the SelectOptions
        ..
    }
}

This can be invoked explicitly from your test code as follows.

@isTest
public class YourTestClass{

    static testMethod void unitTest1(){

        .
        .
        //Assuming your class name is CustomClassName
        CustomClassName.typePicklistValue();
    }
}

Answer 2

 public class SampleController{
   @AuraEnabled
   public static List<SelectOption> samplePicklist(){
    ... your code
   }
 }

My test class:

static testMethod void testSamplePicklist()
{
    List<SelectOption> selectOpt = SampleController.samplePicklist()[0];

    System.assertEquals('PicklistValue', selectOpt[0]);
}