I’ve just watched this presentation by Xavi Gost about Masterclass - Dobles de Test.

These are notes to myself taken while watching the video:

• The type of test double to use should be dictated by the intention of use.
• Test doubles:
  • Dummy: we only need it to be present.
  • Stub: returns fixed values.
  • Mock: more complex scenarios.
• Mocks are evil. When using a mock you are acknowledging a lack of ability / know-how in the design / architecture.
• Mocks introduce complexity in a part of system (tests) that doesn’t deliver value to the customer.

Here’s a mind map of the references used in this presentation: