External Dependency, call to

Call to an external dependency is, as it's name explains, an interaction in which a unit of code sends information to an external dependency such as:

• Database
• HTTP API
• RPC

function additionWithLogging(
  summand: number,
  otherSummand: number,
  logger: ILogger
): number {
  /** Exit point => external dependency call */
  logger.log(`Will add: ${currentValue} + ${summand}`);

  return otherSummand + summand;
}

To verify it a test double is used, in this case a mock.

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