ctest: Exit 1 when argc == 1 and no input file exists

Fixes: #26759

Help/manual/ctest.1.rst

@@ -54,6 +54,9 @@ in the following cases:
 
 * An error occurs, such as failure to process invalid arguments.
 
+* .. versionadded:: 4.4
+    No arguments are given and no ``CTestTestfile.cmake`` exists.
+
 * The :option:`--no-tests=error <ctest --no-tests>` argument is given and no
   tests are executed, e.g., when ``CTestTestfile.cmake`` defines no tests,
   or when the given arguments exclude all tests.

Help/release/dev/ctest-error-exit.rst

@@ -0,0 +1,5 @@
+ctest-error-exit
+----------------
+
+* :manual:`ctest(1)` now exits with non-zero if invoked with no
+  arguments and no test input file exists.

Source/ctest.cxx

@@ -209,12 +209,13 @@ int main(int argc, char const* const* argv)
     return 1;
   }
 
+  bool const haveTestfile = cmSystemTools::FileExists("CTestTestfile.cmake") ||
+    cmSystemTools::FileExists("DartTestfile.txt");
+
   // If there is a testing input file, check for documentation options
   // only if there are actually arguments.  We want running without
   // arguments to run tests.
-  if (argc > 1 ||
-      !(cmSystemTools::FileExists("CTestTestfile.cmake") ||
-        cmSystemTools::FileExists("DartTestfile.txt"))) {
+  if (argc > 1 || !haveTestfile) {
     if (argc == 1) {
       std::cerr << "*********************************\n"
                    "No test configuration file found!\n"
@@ -228,7 +229,8 @@ int main(int argc, char const* const* argv)
       doc.SetSection("Name", cmDocumentationName);
       doc.SetSection("Usage", cmDocumentationUsage);
       doc.PrependSection("Options", cmDocumentationOptions);
-      return !doc.PrintRequestedDocumentation(std::cout);
+      return !doc.PrintRequestedDocumentation(std::cout) ||
+        (argc == 1 && !haveTestfile);
     }
   }
 

Tests/RunCMake/CTestCommandLine/RunCMakeTest.cmake

@@ -424,6 +424,8 @@ add_test(test2 \"${CMAKE_COMMAND}\" -E echo \"not running\")
 endfunction()
 run_stop_on_failure()
 
+run_cmake_command(usage ${CMAKE_CTEST_COMMAND})
+
 function(run_TestAffinity)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/TestAffinity)
   set(RunCMake_TEST_NO_CLEAN 1)

Tests/RunCMake/CTestCommandLine/usage-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/CTestCommandLine/usage-stderr.txt

@@ -0,0 +1,3 @@
+\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*
+No test configuration file found!
+\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Tests/RunCMake/CTestCommandLine/usage-stdout.txt

@@ -0,0 +1,3 @@
+Usage
+
+  ctest \[options\]