How to test Async Step by forcing Sync execution

 1@IsTest
 2private class CountEmployeesStepTest {
 3
 4
 5    @TestSetup
 6    static void testSetup() {
 7        // initializing Breezz setup,
 8        // you have to provide forvendi.BreezzPlugins.BaseApexPlugin implementation
 9        // if you would like to
10        // use public classes like UppercaseNameFieldStep in Breezz
11        forvendi.BreezzApi.TESTS.init('BreezzPlugin');
12    }
13
14
15    @IsTest
16    static void when_CountEveryContactAsEmployee_expect_ContactAddedToAccount() {
17        // create basic account and at least 2 contacts, insert and pull with TESTS.loadRecordById
18        // to check updated account values
19        Account acc = new Account(Name = 'Employer');
20        insert acc;
21        Contact[] cnts= new Contact[]{
22            new Contact(LastName = 'Johnson', AccountId = acc.Id),
23            new Contact(LastName = 'Jordan',AccountId=acc.Id)};
24        Test.startTest();
25        insert cnts;
26        Test.stopTest();
27
28
29        Account account = (Account) forvendi.BreezzAPI.TESTS.loadRecordById(acc.Id);
30        forvendi.BreezzAPI.TESTS.assertErrorLogs();
31        Assert.IsNotNull(account);
32        Assert.IsNotNull(cnts);
33        Assert.areEqual(2, account.NumberOfEmployees);
34    }
35
36
37    @IsTest
38    static void when_ExecutedCountEmployeesStep_expect_CountEveryContactAsEmployee() {
39        // create basic account and at least 2 contacts, insert all.
40        // execute STEP_FUNCTION.build() to test class logic
41        Account acc = new Account(Name = 'Employer');
42        insert acc;
43        Contact[] cnts= new Contact[] {
44            new Contact(LastName = 'Johnson',AccountId=acc.Id),
45            new Contact(LastName = 'Jordan', AccountId=acc.Id)};
46        insert cnts;
47
48
49        Test.startTest();
50        // use skipModificationContextSave() to skip memory clear in modificationContext
51        forvendi.ModificationContext ctx = forvendi.BreezzApi.STEPS.build()
52                .skipModificationContextSave()
53                .addStep(new CountEmployeesStep())
54                .execute(cnts);
55        Test.stopTest();
56       
57        forvendi.BreezzAPI.TESTS.assertErrorLogs();
58        Assert.IsNotNull(ctx.getRecordToUpdate(acc.Id));
59        Assert.areEqual(2, ctx.getRecordToUpdate(acc.Id).get('NumberOfEmployees'));
60    }
61}