add catch as an external project

CMakeLists.txt

@@ -2,7 +2,12 @@ cmake_minimum_required(VERSION 3.0)
 
 project(kallisto)
 
+set(EXT_PROJECTS_DIR ${PROJECT_SOURCE_DIR}/ext)
 
+# Includes Catch in the project:
+add_subdirectory(${EXT_PROJECTS_DIR}/catch)
+include_directories(${CATCH_INCLUDE_DIR} ${COMMON_INCLUDES})
+enable_testing(true)  # Enables unit-testing.
 
 # add_compile_options(-Wall)
 add_compile_options(-std=c++11)
@@ -11,5 +16,5 @@ add_compile_options(-Wdeprecated-register)
 add_subdirectory(src)
 
 add_subdirectory(test)
-enable_testing()
-add_test(MainTest test/tests)
+# enable_testing()
+# add_test(MainTest test/tests)

ext/catch/CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 2.8.8)
+project(catch_builder CXX)
+include(ExternalProject)
+find_package(Git REQUIRED)
+
+ExternalProject_Add(
+    catch
+    PREFIX ${CMAKE_BINARY_DIR}/catch
+    GIT_REPOSITORY https://github.com/philsquared/Catch.git
+    TIMEOUT 10
+    UPDATE_COMMAND ${GIT_EXECUTABLE} pull
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND ""
+    INSTALL_COMMAND ""
+    LOG_DOWNLOAD ON
+    )
+
+# Expose required variable (CATCH_INCLUDE_DIR) to parent scope
+ExternalProject_Get_Property(catch source_dir)
+set(CATCH_INCLUDE_DIR ${source_dir}/include CACHE INTERNAL "Path to include folder for Catch")