Merge commit '0f50c3deef6d8501e49db55a1daf9d4b25f8ce4d' as 'libs/Catch2'

libs/Catch2/projects/SelfTest/WarnAboutNoTests.cmake

@@ -0,0 +1,19 @@
+# Workaround for a peculiarity where CTest disregards the return code from a
+# test command if a PASS_REGULAR_EXPRESSION is also set
+execute_process(
+    COMMAND ${CMAKE_ARGV3} -w NoTests "___nonexistent_test___"
+    RESULT_VARIABLE ret
+    OUTPUT_VARIABLE out
+)
+
+message("${out}")
+
+if(NOT ${ret} MATCHES "^[0-9]+$")
+    message(FATAL_ERROR "${ret}")
+endif()
+
+if(${ret} EQUAL 0)
+    message(FATAL_ERROR "Expected nonzero return code")
+elseif(${out} MATCHES "Helper failed with")
+    message(FATAL_ERROR "Helper failed")
+endif()