MokkeryStubsOptions

When mocking an abstract or open class, its constructor may require arguments. Since Mokkery must invoke this constructor, all required parameters must be provided.

Mokkery uses the following strategies to supply constructor arguments:

• null for nullable types

• 0 for all numeric types

• false for Boolean

• '\u0000' for Char

• Any() for Any

• A kotlin.reflect.KClass instance matching the required type (e.g. Int::class for KClass<Int>)

• The Unit object for Unit

• Empty arrays for all array types

• Empty collections for Iterable, Collection, List, Set, Map, and their mutable counterparts

• The first declared entry for enum types

• Lambdas that return values resolved using the same strategies

• Generated stub implementations for interfaces

• Instantiating concrete classes using available constructors, following the same rules. By default, this works only for inline classes, Throwable subclasses, and classes from kotlin.collections, kotlin.sequences, and kotlin.ranges. For other types, explicit permission is required because invoking constructors may execute unintended code during tests. Public and internal constructors are supported, with default constructors preferred. Enable this behavior in your Gradle build file using the mokkery.stubs.allowConcreteClassInstantiation flag.

• Generating stub implementations for classes. This requires explicit permission for the same reason as concrete classes instantiation. Enable this behavior in your Gradle build file using mokkery.stubs.allowClassInheritance flag.

Mokkery selects the first applicable strategy based on the order listed above.