include unit tests and integration tests in the cmake build

Summary: This enable test targets to be built and ran

Reviewed By: lnicco

Differential Revision: D17408942

fbshipit-source-id: 144d223bc3830d07a0420e9569d3166a8646cd9a

build/fbcode_builder/manifests/katran

@@ -14,8 +14,12 @@ builder = nop
 builder = cmake
 subdir = .
 
-[cmake.defines]
-BUILD_TESTS = OFF
+[cmake.defines.test=on]
+BUILD_TESTS=ON
+
+[cmake.defines.test=off]
+BUILD_TESTS=OFF
+
 
 [dependencies]
 folly