VS: Improve unit test macros

Change `getFirstProject` macro to more flexible version
`getProjectNames`

Tests/RunCMake/VSSolution/StartupProject-check.cmake

@@ -1,4 +1,5 @@
-getFirstProject(first_project StartupProject)
+getProjectNames(projects)
+list(GET projects 0 first_project)
 if(NOT first_project STREQUAL "TestStartup")
   error("TestStartup is not the startup project")
 endif()

Tests/RunCMake/VSSolution/StartupProjectMissing-check.cmake

@@ -1,4 +1,5 @@
-getFirstProject(first_project StartupProjectMissing)
+getProjectNames(projects)
+list(GET projects 0 first_project)
 if(NOT first_project STREQUAL "ALL_BUILD")
   error("ALL_BUILD is not the startup project")
 endif()

Tests/RunCMake/VSSolution/solution_parsing.cmake

@@ -50,17 +50,18 @@ macro(parseGlobalSections arg_out_pre arg_out_post testName)
 endmacro()
 
 
-macro(getFirstProject arg_out_first_project testName)
-  set(${arg_out_first_project} "")
-  set(sln "${RunCMake_TEST_BINARY_DIR}/${testName}.sln")
+macro(getProjectNames arg_out_projects)
+  set(${arg_out_projects} "")
+  set(sln "${RunCMake_TEST_BINARY_DIR}/${test}.sln")
   if(NOT EXISTS "${sln}")
     error("Expected solution file ${sln} does not exist")
   endif()
   file(STRINGS "${sln}" project_lines REGEX "^Project\\(")
-  list(GET project_lines 0 first_project)
-  string(REGEX REPLACE ".* = \"" "" first_project "${first_project}")
-  string(REGEX REPLACE "\", .*"  "" first_project "${first_project}")
-  set(${arg_out_first_project} "${first_project}")
+  foreach(project_line IN LISTS project_lines)
+    string(REGEX REPLACE ".* = \"" "" project_line "${project_line}")
+    string(REGEX REPLACE "\", .*"  "" project_line "${project_line}")
+    list(APPEND ${arg_out_projects} "${project_line}")
+  endforeach()
 endmacro()