added distributed mode to CMake unit tests

Author: TysonRayJones

tests/CMakeLists.txt

@@ -22,6 +22,13 @@ else ()
     target_link_libraries(tests QuEST m)
 endif ()
 
+# distributed unit tests must supply an MPI-clue to (modified) catch
+if (${DISTRIBUTED})
+    add_definitions(-DDISTRIBUTED_MODE)
+    find_package(MPI REQUIRED)
+    include_directories(${MPI_C_INCLUDE_PATH})
+endif ()
+
 # locate Catch2 scripts for CMake
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/catch)
 include(CTest)

tests/catch/catch.hpp

@@ -12,7 +12,9 @@
 #define TWOBLUECUBES_SINGLE_INCLUDE_CATCH_HPP_INCLUDED
 // start catch.hpp
 
-/* code injection for the silencing of distributed testing 
+/* code injection for the silencing of distributed testing. Requires that when 
+ * running tests in distributed mode, a compiler constant DISTRIBUTED_MODE must 
+ * be supplied when processing this file.
  * modified by Tyson Jones, 17th Jan 2020
  */
 #ifdef DISTRIBUTED_MODE