Apex DomainBuilder

DomainBuilder_Test.cls

@IsTest
private class DomainBuilder_Test {

    @IsTest
    private static void easyTestDataCreation() {

        // Setup
        Contact_t jack = new Contact_t().first('Ron').last('Harris');

        new Account_t()
                .name('Acme Corp')
                .add( new Opportunity_t()
                                .amount(1000)
                                .closes(2019, 12)
                                .contact(jack))
                .persist();
        
        // Verify
        ...
    }
}