FindDoxygen: Add tests for ALL option

Tests/FindDoxygen/AllTarget/CMakeLists.txt

@@ -0,0 +1,42 @@
+cmake_minimum_required(VERSION 3.10)
+project(TestFindDoxygen VERSION 1.0 LANGUAGES NONE)
+enable_testing()
+
+find_package(Doxygen REQUIRED)
+
+file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/main.cpp [[
+/**
+ * \file
+ * \brief One C++ file w/ sample Doxygen comment just to produce any docs...
+ */
+]])
+
+set(DOXYGEN_OUTPUT_DIRECTORY outDirWithout)
+file(REMOVE_RECURSE ${CMAKE_CURRENT_BINARY_DIR}/${DOXYGEN_OUTPUT_DIRECTORY})
+doxygen_add_docs(docsNoAll ${CMAKE_CURRENT_BINARY_DIR}/main.cpp)
+
+set(DOXYGEN_OUTPUT_DIRECTORY outDirWith)
+file(REMOVE_RECURSE ${CMAKE_CURRENT_BINARY_DIR}/${DOXYGEN_OUTPUT_DIRECTORY})
+doxygen_add_docs(docsWithAll ALL ${CMAKE_CURRENT_BINARY_DIR}/main.cpp)
+
+# Define tests cases that check whether targets were built
+file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/dirExists.cmake [[
+cmake_minimum_required(VERSION 3.11)
+if(NOT EXISTS ${dirName})
+    message(FATAL_ERROR "Directory does not exist: ${dirName}")
+endif()
+]])
+
+add_test(NAME checkWith COMMAND
+    ${CMAKE_COMMAND}
+    -D dirName=${CMAKE_CURRENT_BINARY_DIR}/outDirWith
+    -P dirExists.cmake
+)
+add_test(NAME checkWithout COMMAND
+    ${CMAKE_COMMAND}
+    -D dirName=${CMAKE_CURRENT_BINARY_DIR}/outDirWithout
+    -P dirExists.cmake
+)
+set_tests_properties(checkWithout PROPERTIES
+    WILL_FAIL TRUE
+)

Tests/FindDoxygen/CMakeLists.txt

@@ -18,6 +18,16 @@ add_test(NAME FindDoxygen.QuotingTest COMMAND
   --build-options ${build_options}
 )
 
+add_test(NAME FindDoxygen.AllTarget COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindDoxygen/AllTarget"
+  "${CMake_BINARY_DIR}/Tests/FindDoxygen/AllTarget"
+  ${build_generator_args}
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+)
+
 if(CMake_TEST_FindDoxygen_Dot)
   add_test(NAME FindDoxygen.DotComponentTest COMMAND
     ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>