BLE: Add unit test for the Generic GattClient.

These tests are build around gtest and gmock and solely run on a host; cmake is
used as a build system:

- cd features/FEATURE_BLE/tests
- mkdir build
- cd build
- cmake ..
- make
- ./gatt-client-tests

Author: pan-

features/FEATURE_BLE/.mbedignore

@@ -0,0 +1 @@
+tests/*

features/FEATURE_BLE/tests/CMakeLists.txt

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+cmake_minimum_required(VERSION 2.8.11)
+
+# Make PROJECT_SOURCE_DIR, PROJECT_BINARY_DIR, and PROJECT_NAME available.
+set(PROJECT_NAME ble-tests)
+project(${PROJECT_NAME})
+
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+################################
+# GTEST
+################################
+
+# Download and unpack googletest at configure time
+configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
+execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
+  RESULT_VARIABLE result
+  WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download )
+if(result)
+  message(FATAL_ERROR "CMake step for googletest failed: ${result}")
+endif()
+execute_process(COMMAND ${CMAKE_COMMAND} --build .
+  RESULT_VARIABLE result
+  WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download )
+if(result)
+  message(FATAL_ERROR "Build step for googletest failed: ${result}")
+endif()
+
+# Prevent overriding the parent project's compiler/linker
+# settings on Windows
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+
+# Add googletest directly to our build. This defines
+# the gtest and gtest_main targets.
+add_subdirectory(${CMAKE_BINARY_DIR}/googletest-src
+                 ${CMAKE_BINARY_DIR}/googletest-build
+                 EXCLUDE_FROM_ALL)
+
+# The gtest/gtest_main targets carry header search path
+# dependencies automatically when using CMake 2.8.11 or
+# later. Otherwise we have to add them here ourselves.
+if (CMAKE_VERSION VERSION_LESS 2.8.11)
+  include_directories(BEFORE SYSTEM
+    "${gtest_SOURCE_DIR}/include" "${gmock_SOURCE_DIR}/include")
+else()
+  target_include_directories(gmock_main SYSTEM BEFORE INTERFACE
+    "${gtest_SOURCE_DIR}/include" "${gmock_SOURCE_DIR}/include")
+endif()
+
+
+################################
+# Testing
+################################
+
+enable_testing()
+
+###############################
+# GattClient test
+###############################
+
+add_executable(gatt-client-tests 
+  mbed_os_stub/mbed_assert.c
+  generic/GattClient/mock/MockCallbacks.cpp
+  generic/GattClient/mock/MockPalGattClient.cpp 
+  generic/GattClient/util/Equality.cpp 
+  generic/GattClient/TestCharacteristicDesctiptorDiscovery.cpp
+  generic/GattClient/TestDiscoverAllServices.cpp
+  generic/GattClient/TestNoCb.cpp
+  generic/GattClient/TestRead.cpp
+  generic/GattClient/TestServerEvent.cpp
+  generic/GattClient/TestWrite.cpp
+  ${PROJECT_SOURCE_DIR}/../source/generic/GenericGattClient.cpp
+)
+
+target_include_directories(gatt-client-tests PRIVATE 
+  "${PROJECT_SOURCE_DIR}/.." 
+  "${PROJECT_SOURCE_DIR}/../../.." 
+  "${PROJECT_SOURCE_DIR}/generic/GattClient"
+)
+
+# Standard linking to gtest stuff.
+target_link_libraries(gatt-client-tests gmock_main)
+
+# This is so you can do 'make gatt-client-tests' to see all your tests run, instead of
+# manually running the executable runUnitTests to see those specific tests.
+add_test(NAME AllUnitTests COMMAND gatt-client-tests)
+
+

features/FEATURE_BLE/tests/CMakeLists.txt.in

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+cmake_minimum_required(VERSION 2.8.11)
+
+project(googletest-download NONE)
+
+include(ExternalProject)
+ExternalProject_Add(googletest
+  GIT_REPOSITORY    https://github.com/google/googletest.git
+  GIT_TAG           master
+  SOURCE_DIR        "${CMAKE_BINARY_DIR}/googletest-src"
+  BINARY_DIR        "${CMAKE_BINARY_DIR}/googletest-build"
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND     ""
+  INSTALL_COMMAND   ""
+  TEST_COMMAND      ""
+)