These three calls all have the same pattern. Each can be described as follows:

insert(Employee.class): Defines an insert operation. By providing a type parameter, the subsequent operations are typesafe.

using(new Employee(…)): Here is where the actual data is provided.

as(StepVerifier::create): The same pattern of using Reactor Test to force the execution of our reactive flow.

expectNextCount(1): For a single insert, we are expecting a single response.

verifyComplete(): Verifies whether we received the onComplete signal.