[SalesForce] How to write unit tests for a post install script

I'm trying to write a unit test for a post install script class, a class that implements InstallHandler interface.
I'm testing two cases:
1- No previous version is defined, for that I just use this:

PostInstallClass postinstall = new PostInstallClass();
Test.testInstall(postinstall, null);

This is working fine.

2- A previous version exists, but for that I'm getting an error System.QueryException: List has no rows for assignment to SObject

PostInstallClass postinstall = new PostInstallClass();
Test.testInstall(postinstall,  new Version(1, 0));

So how to test this second case? How to simulate a test environment where a previous version of a managed package exists?
Thanks.

Best Answer

The System.QueryException happened in Test.testIntall(postInstall, new Version(1, 0)). But I figured out the problem. I need to put Test.testInstall(postinstall, null) before the other one. So this way it works fine:

PostInstallClass postinstall = new PostInstallClass();
Test.testInstall(postinstall,  null);
Test.testInstall(postinstall,  new Version(1, 0));

This way, the system fiends something (the provisos version) and thus there is no error anymore.

Thanks anyway!

Related Solutions

[SalesForce] Any way to easily create unit tests for a wsdl2apex generated Apex class

Here is a blog for the solution i used for the Metadata Apex API WSDL test class. The approach uses a semi-generic WebServiceMock implementation and type instantiation to cover the code. You can obtain 100% coverage with this approach. Note that you don't need to add any real logic to your test, the generated code just needs the return type created and any related types referenced.

This is the pattern used in the blog...

@IsTest
private with sharing class wwwUpsComWsdlXoltwsXavV10Test
{
    private class WebServiceMockImpl implements WebServiceMock
    {
        public void doInvoke(
            Object stub, Object request, Map<String, Object> response,
            String endpoint, String soapAction, String requestName,
            String responseNS, String responseName, String responseType)
        {
            if(request instanceof wwwUpsComXmlschemaXoltwsXavV10.XAVRequest_element)
                response.put('response_x', new wwwUpsComXmlschemaXoltwsXavV10.XAVResponse_element());
            return;
        }
    }
}

@IsTest
private with sharing class wwwUpsComWsdlXoltwsXavV10Test
{
    private static testMethod void coverMethods()
    {
        new wwwUpsComWsdlXoltwsXavV10.XAVPort().ProcessXAV(null, null, null, null);
    }
}

Then for each type add line in the following test method...

@IsTest
private with sharing class wwwUpsComWsdlXoltwsXavV10Test
{
    private static testMethod void coverTypes()
    {
        new wwwUpsComXmlschemaXoltwsCommonV10.TransactionReferenceType();
    }
}

Its currently hand coded, however I've been recently playing around with native Apex parsing and code generation with the Tooling API. Though once you get a copy paste flow going from the generated code to the test methods it can be done quite quickly tbh.

Hope this helps...

[SalesForce] How to test apex classes with Pagereference

You have a parameter mismatch. In one spot you are looking for 'orderId', and the other you are using 'Id'. I would make the parameter name a constant to facilitate testing.

public with sharing class redirectOrderPartner
{
    public static final String NAME_PARAM = 'orderId';
    // other stuff
}

@IsTest
class redirectOrderPartner_TEST
{
    static testMethod void testRedirect()
    {
        // do some stuff
        ApexPages.currentPage().getParameters().put(
            redirectOrderPartner.NAME_PARAM, tempOrder.Name
        );
        // do some other stuff
    }
}

Best Answer

Related Solutions

[SalesForce] Any way to easily create unit tests for a wsdl2apex generated Apex class

[SalesForce] How to test apex classes with Pagereference

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