One of my test methods is returning the following error:

Case: CaseTriggerHandlerTest
Method: test_insertSingleWebCase
Error: "line -1, column -1: Dependent class is invalid and needs recompilation: Class TestDataFactory : Variable does not exist: ArticleType"



While it's true that "ArticleType" doesn't exist in my TestDataFactory apex class, I don't reference that variable in my CaseTriggerHandlerTest class either. The "test_insertSingleWebCase" doesn't reference one either.

Here is the method that is failing in CaseTriggerHandlerTest:

@isTest static void test_insertSingleWebCase() {
        // Mock up a test Web Case
        List<Case> testWebCases = TestDataFactory.createWebCase(1);
        System.debug('testWebCases.size: ' + testWebCases.size() + ' | ' + testWebCases);
        System.AssertEquals(testWebCases.size(), 1);
        
        Id origContactId = testWebCases[0].ContactId;
        String origSuppliedName = testWebCases[0].SuppliedName;
        insert testWebCases[0];
        
        // Query / Reload the Case so we can get the Contact ID, which was not initially provided but should auto update
        Case c = [SELECT Id, ContactId FROM Case WHERE Id = :testWebCases[0].Id];
        
        // Expected Behavior: Contact ID should not be NULL (because the Case Trigger has inserted a new contact)
        System.AssertNotEquals(c.ContactId, NULL);
        
        // Modify the SuppliedName, but add another case with the same SuppliedEmail. Verify you get same c.ContactId
        // (i.e., this should NOT have resulted in a second Contact being created)
        testWebCases = TestDataFactory.createWebCase(1); // get a new case
        testWebCases[0].SuppliedName = 'Surprise!';
        insert testWebCases[0];
        
        c = [SELECT Id, ContactId, SuppliedName FROM Case WHERE Id = :testWebCases[0].Id];
        
        System.AssertNotEquals (origContactId, c.ContactId);
        System.AssertNotEquals(origSuppliedName,c.SuppliedName);
    }

Here is the entire TestDataFactory class:

public abstract class TestDataFactory {
    
    // Account Creation
    public static List<Account> createAccounts (Integer numberOfAccounts) {
        List<Account> accounts = new List<Account>();
        for (Integer i=0 ; i < numberOfAccounts ; i++) {
            Account testAccount = new Account(Name='Test Account' + i);
            accounts.add(testAccount);
        }
		return accounts;
    }
    
    // Contact Creation
    public static List<Contact> createContacts (Account testAccount, Integer numberOfContacts) {
        List<Contact> contacts = new List<Contact>();
        for (Integer i=0; i < numberOfContacts; i++) {
            String strLastName = 'Jones'+i;
            String strEmail = strLastName+'@'+testAccount.Name+'.com';
            strEmail = strEmail.remove(' ');
            Contact testContact = new Contact(LastName=strLastName, AccountId=testAccount.Id, Email=strEmail);
            contacts.add(testContact);
        }
        return contacts;
    }
    
    // Web Case Creation
    public static List<Case> createWebCase (Integer numberOfWebCases) {
        List<Case> testCases = new List<Case>();
        Map<String, Schema.RecordTypeInfo> recordTypes = Schema.SObjectType.Case.getRecordTypeInfosByName();
        Id caseRecordType = recordTypes.get('1819 Case').getRecordTypeId();

        for (Integer i=0; i<numberOfWebCases; i++) {
            String strSuppliedName='Bob Jones'+i;
            String strSuppliedEmail='bob_jones'+i+'@randomdomain.com';
            
            Case testCase = new Case(Status = 'New', 
                                     Priority = 'Normal', 
                                     Origin = 'Email', 
                                     RecordTypeId = caseRecordType,
                           			 SuppliedEmail = strSuppliedEmail, 
                                     SuppliedName = strSuppliedName,
                           			 Subject='Test Case', 
                                     Description='This is a test. This is only a test.');
            testCases.add(testCase);
        }
        
        return testCases;
    }

}