chargebee-customer-endpoint-test-double.php

<?php

final class ChargebeeCustomerEndpointTestDouble {
  private array $customers = [];
   
  public function givenCustomerExists(Customer $customer): void {
    $this->customers[$customer->id] = $customer;
  }
  
  public function updateCustomer(CustomerId $id, CustomerChangePayload $change): void {
    $this->customers[$id->value] = $this->get($id)->withName($change->name);
  }
  
  public function get(CustomerId $id): Customer {
    return $this->customers[$id->value] ?? throw new CustomerNotFoundException();
  }
}

company-name-test.php

<?php

#[Test]
function companyNameChangeIsReflectedInChargebee(): void {
   // given we set up the pre-existing context:
   $companyScenario = $this->companyUseCase->givenCompanyExists("Evil Corp");
   $this->chargebeeUseCase->givenCustomerExists(
     new Customer(
       id: $companyScenario->companyId, 
       name: "Evil Corp",
     ),
   );
   // when the API is called
   $companyScenario->changeCompanyName("Acme");
   // then expect the side-effect was produced by inspecting our test double
   $actual = $this->chargebeeUseCase->getCustomer($customer->companyId);
   self::assertSame("Acme", $actual->name);
}

company-scenario.php

<?php

function changeCompanyName(string $name): void {
  $response = PatchCompanyEndpointAssertion::of(
    $this->httpClient->patch('/api/company', ['name' => $name]),
  );
  $response->assertSuccessful();
  $response->assertName($name);
}