# test/filter Set a substring filter for which tests run. Matches suite name, test name, or the `"<suite>::<name>"` key. ## Syntax

[test/filter "substring"]
[test/filter nil]   # clear

## Parameters - `"substring"` — filter string, or `nil` to clear. ## Examples

[test/filter "parse"]
[test/filter nil]

## Returns `nil`. ## See Also `test/mode`, `test/results`, `deftest`