gtest: Organized Gtest unit tests

This commit limits which tests run on which ARCH to allow all tests to
pass on CI.

    * Qualify the FTDI tests with (FTDI4222 AND USBPLAT)
    * Qualify the IO init tests with (DETECTED_ARCH == "MOCK")
    * Renamed all unit tests to start with 'test_unit_' to facilitate
      grouping with tab completion (or any other type of sorting)
    * Updated docker targets with new unit test target name

Signed-off-by: Noel Eck <noel.eck@intel.com>

docker-compose.yaml

@@ -118,21 +118,21 @@ services:
     environment:
       - BUILDSWIG=ON
       - BUILDSWIGPYTHON=ON
-    command: bash -c "./scripts/run-cmake.sh && cd build && make _python2-mraa tests-unit && ctest --output-on-failure"
+    command: bash -c "./scripts/run-cmake.sh && cd build && make _python2-mraa test_unit_all && ctest --output-on-failure"
 
   python3:
     extends: python2
     environment:
       - USEPYTHON3TESTS=ON
-    command: bash -c "./scripts/run-cmake.sh && cd build && make _python3-mraa tests-unit && ctest --output-on-failure"
+    command: bash -c "./scripts/run-cmake.sh && cd build && make _python3-mraa test_unit_all && ctest --output-on-failure"
 
   java:
     extends: base
     image: inteliotdevkit/mraa-java
     environment:
       - BUILDSWIG=ON
       - BUILDSWIGJAVA=ON
-    command: bash -c "./scripts/run-cmake.sh && cd build && make mraajava tests-unit && ctest --output-on-failure"
+    command: bash -c "./scripts/run-cmake.sh && cd build && make mraajava test_unit_all && ctest --output-on-failure"
 
   android:
     extends: java

tests/unit/CMakeLists.txt

@@ -8,39 +8,39 @@ if(NOT GTEST_FOUND)
 endif()
 
 # Unit tests - C common header methods
-add_executable(api_common_h_unit api/api_common_h_unit.cxx)
-target_link_libraries(api_common_h_unit GTest::GTest GTest::Main mraa)
-target_include_directories(api_common_h_unit
+add_executable(test_unit_common_h api/api_common_h_unit.cxx)
+target_link_libraries(test_unit_common_h GTest::GTest GTest::Main mraa)
+target_include_directories(test_unit_common_h
     PRIVATE "${CMAKE_SOURCE_DIR}" "${CMAKE_SOURCE_DIR}/api" "${CMAKE_SOURCE_DIR}/api/mraa")
-gtest_add_tests(api_common_h_unit "" AUTO)
+gtest_add_tests(test_unit_common_h "" AUTO)
+list(APPEND GTEST_UNIT_TEST_TARGETS test_unit_common_h)
 
 # Unit tests - C++ common header methods
-add_executable(api_common_hpp_unit api/api_common_hpp_unit.cxx)
-target_link_libraries(api_common_hpp_unit GTest::GTest GTest::Main mraa)
-target_include_directories(api_common_hpp_unit PRIVATE "${CMAKE_SOURCE_DIR}/api")
-gtest_add_tests(api_common_hpp_unit "" AUTO)
+add_executable(test_unit_common_hpp api/api_common_hpp_unit.cxx)
+target_link_libraries(test_unit_common_hpp GTest::GTest GTest::Main mraa)
+target_include_directories(test_unit_common_hpp PRIVATE "${CMAKE_SOURCE_DIR}/api")
+gtest_add_tests(test_unit_common_hpp "" AUTO)
+list(APPEND GTEST_UNIT_TEST_TARGETS test_unit_common_hpp)
 
-if (FTDI4222)
+if (FTDI4222 AND USBPLAT)
     # Unit tests - Test platform extenders (as much as possible)
-    add_executable(platform_extender platform_extender/platform_extender.cxx)
-    target_link_libraries(platform_extender GTest::GTest GTest::Main mraa-platform-ft4222 dl)
-    target_include_directories(platform_extender PRIVATE "${PROJECT_SOURCE_DIR}/api"
+    add_executable(test_unit_ftdi4222 platform_extender/platform_extender.cxx)
+    target_link_libraries(test_unit_ftdi4222 GTest::GTest GTest::Main mraa-platform-ft4222 dl)
+    target_include_directories(test_unit_ftdi4222 PRIVATE "${PROJECT_SOURCE_DIR}/api"
         "${PROJECT_SOURCE_DIR}/api/mraa"
         "${PROJECT_SOURCE_DIR}/include")
-    gtest_add_tests(platform_extender "" AUTO)
+    gtest_add_tests(test_unit_ftdi4222 "" AUTO)
+    list(APPEND GTEST_UNIT_TEST_TARGETS test_unit_ftdi4222)
 endif ()
 
-# Unit tests - C initio header methods
-add_executable(mraa_initio_h_unit api/mraa_initio_h_unit.cxx)
-target_link_libraries(mraa_initio_h_unit GTest::GTest GTest::Main mraa)
-target_include_directories(mraa_initio_h_unit PRIVATE "${CMAKE_SOURCE_DIR}/api")
-gtest_add_tests(mraa_initio_h_unit "" AUTO)
+# Unit tests - test C initio header methods on MOCK platform only
+if (DETECTED_ARCH STREQUAL "MOCK")
+    add_executable(test_unit_ioinit_h api/mraa_initio_h_unit.cxx)
+    target_link_libraries(test_unit_ioinit_h GTest::GTest GTest::Main mraa)
+    target_include_directories(test_unit_ioinit_h PRIVATE "${CMAKE_SOURCE_DIR}/api")
+    gtest_add_tests(test_unit_ioinit_h "" AUTO)
+    list(APPEND GTEST_UNIT_TEST_TARGETS test_unit_ioinit_h)
+endif()
 
-# Add a custom target for unit tests
-add_custom_target(tests-unit ALL
-    DEPENDS
-        api_common_h_unit
-        api_common_hpp_unit
-        platform_extender
-        mraa_initio_h_unit
-        COMMENT "mraa unit test collection")
+# Add a target for all unit tests
+add_custom_target(test_unit_all ALL DEPENDS ${GTEST_UNIT_TEST_TARGETS})