Tests: Try to make CTestTestTimeout more robust

Write to the timeout test log file before sleeping and flush to be sure
it is created.  Move the check that the after-sleep line is not written
out to the ctest script.  Rename the CheckChild test to TestSleep since
it no longer checks.  Do not try to read the log file if it does not
exist.

Tests/CMakeLists.txt

@@ -2394,7 +2394,7 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
     --output-log "${CMake_BINARY_DIR}/Tests/CTestTestTimeout/testOutput.log"
     )
   set_tests_properties(CTestTestTimeout PROPERTIES
-    PASS_REGULAR_EXPRESSION "TestTimeout *\\.+ *\\*\\*\\*Timeout.*CheckChild *\\.+ *Passed")
+    PASS_REGULAR_EXPRESSION "TestTimeout *\\.+ *\\*\\*\\*Timeout.*TestSleep *\\.+ *Passed.*timeout correctly killed child")
 
   add_test(
     NAME CTestTestRerunFailed

Tests/CTestTestTimeout/CMakeLists.txt

@@ -11,18 +11,14 @@ if(NOT TIMEOUT)
 endif()
 
 add_definitions(-DTIMEOUT=${TIMEOUT})
-add_executable (Timeout timeout.c)
+add_executable (Sleep sleep.c)
 
 add_test(NAME TestTimeout
-  COMMAND ${CMAKE_COMMAND} -D Timeout=$<TARGET_FILE:Timeout>
+  COMMAND ${CMAKE_COMMAND} -D Sleep=$<TARGET_FILE:Sleep>
                            -D Log=${CMAKE_CURRENT_BINARY_DIR}/timeout.log
                            -P ${CMAKE_CURRENT_SOURCE_DIR}/timeout.cmake
   )
 set_tests_properties(TestTimeout PROPERTIES TIMEOUT ${TIMEOUT})
 
-add_test(NAME CheckChild
-  COMMAND ${CMAKE_COMMAND} -D Timeout=$<TARGET_FILE:Timeout>
-                           -D Log=${CMAKE_CURRENT_BINARY_DIR}/timeout.log
-                           -P ${CMAKE_CURRENT_SOURCE_DIR}/check.cmake
-  )
-set_tests_properties(CheckChild PROPERTIES DEPENDS TestTimeout)
+add_test(NAME TestSleep COMMAND Sleep)
+set_tests_properties(TestSleep PROPERTIES DEPENDS TestTimeout)

Tests/CTestTestTimeout/check.cmake

@@ -1,9 +0,0 @@
-# Block just as long as timeout.cmake would if it were not killed.
-execute_process(COMMAND ${Timeout})
-
-# Verify that the log is empty, which indicates that the grandchild
-# was killed before it finished sleeping.
-file(READ "${Log}" LOG)
-if(NOT "${LOG}" STREQUAL "")
-  message(FATAL_ERROR "${LOG}")
-endif()

Tests/CTestTestTimeout/sleep.c

@@ -0,0 +1,21 @@
+#if defined(_WIN32)
+# include <windows.h>
+#else
+# include <unistd.h>
+#endif
+
+#include <stdio.h>
+
+int main(void)
+{
+  fprintf(stderr, "before sleep\n");
+  fflush(stderr); /* should not be needed, but just in case */
+#if defined(_WIN32)
+  Sleep((TIMEOUT+4)*1000);
+#else
+  sleep((TIMEOUT+4));
+#endif
+  fprintf(stderr, "after sleep\n");
+  fflush(stderr); /* should not be needed, but just in case */
+  return 0;
+}

Tests/CTestTestTimeout/test.cmake.in

@@ -24,3 +24,16 @@ CTEST_START(Experimental)
 CTEST_CONFIGURE(BUILD "${CTEST_BINARY_DIRECTORY}" RETURN_VALUE res)
 CTEST_BUILD(BUILD "${CTEST_BINARY_DIRECTORY}" RETURN_VALUE res)
 CTEST_TEST(BUILD "${CTEST_BINARY_DIRECTORY}" RETURN_VALUE res)
+
+set(log ${CTEST_BINARY_DIRECTORY}/timeout.log)
+if(EXISTS "${log}")
+  # Verify that the timeout test did not finish sleeping.
+  file(STRINGS "${log}" after_sleep REGEX "after sleep")
+  if(after_sleep)
+    message(FATAL_ERROR "Log indicates timeout did not kill child.")
+  else()
+    message("Log indicates timeout correctly killed child.")
+  endif()
+else()
+  message(FATAL_ERROR "Log does not exist:\n  ${log}")
+endif()

Tests/CTestTestTimeout/timeout.c

@@ -1,18 +0,0 @@
-#if defined(_WIN32)
-# include <windows.h>
-#else
-# include <unistd.h>
-#endif
-
-#include <stdio.h>
-
-int main(void)
-{
-#if defined(_WIN32)
-  Sleep((TIMEOUT+4)*1000);
-#else
-  sleep((TIMEOUT+4));
-#endif
-  printf("timeout process finished sleeping!\n");
-  return -1;
-}

Tests/CTestTestTimeout/timeout.cmake

@@ -3,4 +3,4 @@ file(REMOVE ${Log})
 
 # Run a child that sleeps longer than the timout of this test.
 # Log its output so check.cmake can verify it dies.
-execute_process(COMMAND ${Timeout} OUTPUT_FILE ${Log})
+execute_process(COMMAND ${Sleep} ERROR_FILE ${Log})