Tests: Add case for cmake --build with a failing target

Tests/RunCMake/CommandLine/BuildDir--build-multiple-targets-fail-result.txt

@@ -0,0 +1 @@
+[^0]

Tests/RunCMake/CommandLine/BuildDir--build-multiple-targets-fail-stderr.txt

@@ -0,0 +1 @@
+.*

Tests/RunCMake/CommandLine/BuildDir/CMakeLists.txt

@@ -5,3 +5,4 @@ add_custom_command(
 add_custom_target(CustomTarget ALL DEPENDS output.txt)
 add_custom_target(CustomTarget2 ALL DEPENDS output.txt)
 add_custom_target(CustomTarget3 ALL DEPENDS output.txt)
+add_custom_target(CustomTargetFail COMMAND DoesNotExist)

Tests/RunCMake/CommandLine/RunCMakeTest.cmake

@@ -134,6 +134,8 @@ function(run_BuildDir)
     ${CMAKE_COMMAND} --build BuildDir-build --target CustomTarget)
   run_cmake_command(BuildDir--build-multiple-targets ${CMAKE_COMMAND} -E chdir ..
     ${CMAKE_COMMAND} --build BuildDir-build -t CustomTarget2 --target CustomTarget3)
+  run_cmake_command(BuildDir--build-multiple-targets-fail ${CMAKE_COMMAND} -E chdir ..
+    ${CMAKE_COMMAND} --build BuildDir-build -t CustomTargetFail --target CustomTarget3)
   run_cmake_command(BuildDir--build-multiple-targets-jobs ${CMAKE_COMMAND} -E chdir ..
     ${CMAKE_COMMAND} --build BuildDir-build --target CustomTarget CustomTarget2 -j2 --target CustomTarget3)
   run_cmake_command(BuildDir--build-multiple-targets-with-clean-first ${CMAKE_COMMAND} -E chdir ..