unit test cases not found in MSUnitTest project

Getting issue related with Unittestcases - not found build succeed but getting below error -

------ Discover test started ------
Test run will use DLL(s) built for framework Framework45 and platform X86. Following DLL(s) will not be part of run: 
newdemo.dll, demoTest.dll are built for Framework Framework45 and Platform X64.
 Go to http://ift.tt/1oqQLBU for more details on managing these settings.
========== Discover test finished: 0 found (0:00:00.7020702) ==========

Any clue I tried to change the build configuration build seems i missed something.