Add Catch2 as C++ test framework

Use -DCMAKE_BUILD_TEST_SUITE=1 during CMake invocation to activate building the tests.
The 'tests' target builds the unit tests which can then be executed using the 'test' target.

We depend on the Catch2 version of the system.
Since development normally takes place on current OSs, this shouldn't pose a problem.

CMakeLists.txt

@@ -134,6 +134,7 @@ mark_as_advanced(
     ZM_SYSTEMD
     ZM_MANPAGE_DEST_PREFIX)
 
+option(BUILD_TEST_SUITE "Build the test suite" 0)
 option(BUILD_MAN "Build man pages" 1)
 
 set(ZM_RUNDIR "/var/run/zm" CACHE PATH
@@ -899,6 +900,16 @@ add_subdirectory(web)
 add_subdirectory(misc)
 add_subdirectory(onvif)
 
+if(BUILD_TEST_SUITE)
+	message("Building unit tests: Yes")
+	find_package(Catch2 REQUIRED)
+
+	include(CTest)
+	add_subdirectory(tests)
+else()
+	message("Building unit tests: No (default)")
+endif(BUILD_TEST_SUITE)
+
 # Process distro subdirectories
 if((ZM_TARGET_DISTRO MATCHES "^el") OR (ZM_TARGET_DISTRO MATCHES "^fc"))
 	add_subdirectory(distros/redhat)

src/CMakeLists.txt

@@ -72,6 +72,11 @@ set(ZM_BIN_SRC_FILES
 
 # A fix for cmake recompiling the source files for every target.
 add_library(zm STATIC ${ZM_BIN_SRC_FILES})
+
+target_include_directories(zm
+  PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR})
+
 link_directories(libbcrypt)
 
 add_executable(zmc zmc.cpp)

tests/CMakeLists.txt

@@ -0,0 +1,29 @@
+# This file is part of the ZoneMinder Project.
+#
+# This file is free software; as a special exception the author gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+
+include(Catch)
+
+set(TEST_SOURCES)
+
+add_executable(tests main.cpp ${TEST_SOURCES})
+
+target_link_libraries(tests
+  PRIVATE
+    zm
+    ${ZM_BIN_LIBS}
+    bcrypt
+    Catch2::Catch2)
+
+target_include_directories(tests
+  PRIVATE
+    ${CMAKE_CURRENT_BINARY_DIR})
+
+catch_discover_tests(tests)

tests/main.cpp

@@ -0,0 +1,19 @@
+/*
+ * This file is part of the ZoneMinder Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define CATCH_CONFIG_MAIN
+#include "catch2/catch.hpp"