My primary test framework for C++ projects is Google Test due to its heavy support for mocking and other advanced features.  I also really like the fact that the CLion IDE from JetBrains has built-in support for Google Test.

Features:

• xUnit test framework
• Rich set of assertions
• User-defined assertions
• Death tests
• Fatal and non-fatal failures
• Parameratized tests by value and type
• Variety of options for running tests

Supported on a variety of platforms:

• Linux
• macOS
• Windows
• Windows Mobile
• Cygwin
• MinGW
• Symbian

https://github.com/google/googletest

Parallel test execution

Google also has a script that in their gtest-parallel project which can significantly speed up test case execution on multi-core machines.  This script first gets the list of all the tests cases and then launches multiple processes to run all the tests.