`bynk.mock.*` errors

Mock[T] fabricates values in tests only. These are its common errors.

bynk.mock.outside_test

[bynk.mock.outside_test] Error: `Mock[T]` is only valid inside a test case body

Cause: you used Mock[T] outside a test "…" { … } case — for example in a regular function.

Fix: move the Mock[T] into a test case. To construct a value in production code, use a real constructor instead (.of or .unsafe for a refined or opaque type; a record/variant literal otherwise).

bynk.mock.needs_pin

[bynk.mock.needs_pin] bare `Mock[Code]` cannot generate a value for a `Matches` refinement

Cause: you wrote a bare Mock[T] for a type whose refinement is a Matches pattern. Bynk cannot invent a string that matches an arbitrary regex.

Fix: pin a concrete value that satisfies the pattern. Given the type:

type Code = String where Matches("[a-z]+")

…pin the value where you mock it in a test case:

let c = Mock[Code]("abc")

Other Mock errors

• The type doesn’t resolve, or its kind can’t be mocked — check the type name and see the testing reference.
• A pinned value that violates the refinement is rejected for the same reason a literal would be (see bynk.refine.literal_violates).

Related

• Write tests and mock collaborators
• Reference: testing