Return exit code 4 if all test cases are skipped

src/catch2/catch_session.cpp

@@ -341,6 +341,11 @@ namespace Catch {
                 return 2;
             }
 
+            if ( totals.testCases.total() > 0 &&
+                 totals.testCases.total() == totals.testCases.skipped ) {
+                return 4;
+            }
+
             // Note that on unices only the lower 8 bits are usually used, clamping
             // the return value to 255 prevents false negative when some multiple
             // of 256 tests has failed

tests/ExtraTests/CMakeLists.txt

@@ -487,15 +487,32 @@ set_tests_properties(TestSpecs::EmptySpecWithNoTestsFails
   PROPERTIES
     WILL_FAIL ON
 )
+
 add_test(
   NAME TestSpecs::OverrideFailureWithEmptySpec
   COMMAND $<TARGET_FILE:NoTests> --allow-running-no-tests
 )
+
 add_test(
   NAME List::Listeners::WorksWithoutRegisteredListeners
   COMMAND $<TARGET_FILE:NoTests> --list-listeners
 )
+
+
+add_executable(AllSkipped ${TESTS_DIR}/X93-AllSkipped.cpp)
+target_link_libraries(AllSkipped PRIVATE Catch2::Catch2WithMain)
+
+add_test(
+  NAME TestSpecs::SkippingAllTestsFails
+  COMMAND $<TARGET_FILE:AllSkipped>
+)
+set_tests_properties(TestSpecs::SkippingAllTestsFails
+  PROPERTIES
+    WILL_FAIL ON
+)
+
 set( EXTRA_TEST_BINARIES
+    AllSkipped
     PrefixedMacros
     DisabledMacros
     DisabledExceptions-DefaultHandler

tests/ExtraTests/X93-AllSkipped.cpp

@@ -0,0 +1,16 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+#include <catch2/catch_test_macros.hpp>
+
+TEST_CASE( "this test case is being skipped" ) { SKIP(); }
+
+TEST_CASE( "all sections in this test case are being skipped" ) {
+    SECTION( "A" ) { SKIP(); }
+    SECTION( "B" ) { SKIP(); }
+}