Limiting Fakes with During Filters

Top Previous Next

With Isolator++ Professional, you can limit fakes so they only apply during specific runtime conditions.

This prevents unintended side effects and makes tests more precise.

You can apply During filters at three levels:

·	Suite level: Isolator(During(...))

·	Instance level: a.Fake.Instance<T>(During(...))

·	Call level: a.CallTo(...).During(...)

Note: Precedence: Call > Instance > Suite, use IgnoreHigherLevels() to stop broader filters from applying.

During filters can be defined with:

·	Built-in helpers (e.g., A::Module, A::Thread, A::Call)

·	Custom lambdas using DuringContext.

·	Combinations across multiple levels for fine-grained control.

See More:

During filters can also be defined with Verbose Logging, see more in Combined Filters With Verbose.

Note: The During Filters feature is available in the Enterprise license of Isolator++ Professional only.