METHOD DOES NOT EXIST during unittest attempts

Hello, 
as i'm trying to develop a operation and its methods (SQL adapter), I'm running into issues when i run my test class. 
I have the class i want to test in the very same folder as my test class. 
I followed the tutorial in the documentation. 
When i run the test class, i get the following message error : 

LogStateStatus:0::ERREUR #5002: Erreur Cache: <METHOD DOES NOT EXIST>zTestAdd+1^unitTests.testMyClass.1 *myMethod,Package.BO.MyClass  

Here is my test class (heavily inspired bythe documentation :-) :
 

Class unitTests.testSqlInscription Extends %UnitTest.TestCase

{
Method TestMyMethod()
{
 do $$$AssertEquals(##class(unitTests.sqlInscription).getIdByEmail(2013569),1953642, "Test MyMethod()=1953642")
}
}

Here is a overview of the class and the method i'm testing (modified for confidentiality reasons) :

Include EnsSQLTypes

Class unitTests.sqlInscription Extends Ens.BusinessOperation

{
Parameter ADAPTER = "Custom.SQL.OutboundAdapter";
Property Adapter As Custom.SQL.OutboundAdapter;
Parameter INVOCATION = "Queue";

Method getIdByEmail(pRequest As Package.Msg.myMethodRequest, Output pResponse As Package.Msg.myMethodResponse) As %Status
{
        set tStatus = $$$OK
        try{
            s pResponse = ##class(Package.Msg.myMethodResponse).%New()
            s sqlGetid = " SELECT TOP 1 id FROM [database].Table WHERE email = ? "
            $$$ThrowOnError(..Adapter.ExecuteQuery(.tResult, sqlGetid  , pRequest.someProperty))
            set id = ""
            if (tResult.Next())
            {
                set id = tResult.Get("column_id") // id being the column in the database
            }
            s pResponse.myOutput = idTiers
        }
        catch exp{
            Set tStatus = exp.AsStatus()
        }
        Quit tStatus
}

The execution of teh test is done properly (UnitTestRoot is configured correctly, the test class seemed to be found and executed, but the method i'm rtying to test cannot be located for some reason) 
I can't make sense of it at all, any help is much appreciated. 
Thank you