On this page of ReSharper options, you can adjust general settings that apply to all unit testing features.
Default platform architecture
This selector allows choosing a platform to run unit tests on.
Default .NET Framework version
This selector allows setting .NET version to use when running unit tests.
Run up to [number of assemblies] assemblies in parallel
Select the number of assemblies to be tested by ReSharper concurrently in parallel threads.
Skip tests from categories
Type names of test categories to be excluded from the run. The tests associated with the category that you specified are ignored. For more information, see Working with Test Categories
Unit Test Sessions
Save and restore Unit Test Sessions
Select this check box to allow ReSharper to restore unit test sessions when you close and reopen Visual Studio.
Show log entries with severity
Unit Test Output
Wrap long lines in Unit Test Session output
Defines how to display long lines in the Output tab in the Unit Test Sessions window. If this check box is selected, long lines are wrapped.
Limit auto-loaded output to:
Defines how to many lines should be displayed in the Output tab in the Unit Test Sessions window.