Exit Point

Description:

Result (verifiable externally) obtained by executing a unit of code.

Types (RED):

• Return value. (Easiest to verify).
• Effect, change of state
• Dependency, call to external. (Hardest to verify)

let currentValue = 0;

function additionWithLogging(summand: number, logger: ILogger): number {
  /** Exit point 1 => external dependency call (D) */
  logger.log(`Will add: ${currentValue} + ${summand}`);
  /** Exit point 2 => effect, change of state (E) */
  currentValue += summand;

  /** Exit point 3 => return value (R) */
  return currentValue;
}

Every unit of code has exit point(s).

Only one exit point is verified per unit test

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