A clock double returns 10 whenever its hour method is called. Which role does that chosen response serve?

• A mock checking hour requests
• A stub supplying a fixed result
• A clock reading wall time

A test substitutes a controlled object for its database dependency. What is the substituted object?

• A test double under test control
• Another live database replica
• An index on the real database

A mock can support checking which calls a dependency received.

The contract requires requesting user 73 from a database dependency. Which check directly tests that required interaction?

• Check that the returned row belongs to user 73
• Return a canned row containing user 73 and compare the final display
• Record the boundary request and check its user argument

Greeting logic reads the current hour. Which seam lets the test choose that hour while still testing the greeting logic?

• Replace greeting logic with a fixed result
• Pass a clock dependency that the test can replace
• Intercept the formatted message after greeting runs

A test asserts that a private helper named load_row was called. The helper is renamed and public behaviour stays the same. Why can this assertion fail?

• The expected row changes with the helper's name
• The private helper name is part of the public contract
• The assertion depends on the helper's internal name

Ana substitutes a mock configured to return a chosen network response. She checks the final user message, not recorded calls. What role does the double serve here?

• It verifies recorded requests by checking the final message
• It supplies a controlled response in the stub role
• It checks the network's own response instead of a substitute

Application code receives a database dependency, and tests supply a compatible double. What does this design establish?

• The test can substitute the dependency at that seam
• The double checks compatibility with the real database
• The injected object tests query performance