I googled and found the below helpful references. Currently I want to run all from the command-line (for easy of execution & quickness) in cases:
Currently I can have some answers for my needs:
A specific test (ie. a test written by a method marked [TestMethod()])
Use MSTest.exe /container:TheAssemblyContainingYourSpecificTest /test:TheSpecificTestName
All tests in a class
Use MSTest.exe /container:TheAssemblyContainingYourClass /test:TheClassNameWithFullNamespace
Note that the /test: is the filter which uses the full name of the class when filtering.
The others are still left unknown. Please disscuss if you know how.