Tests: Add case covering GoogleTest odd PROPERTIES warning

Follow up commit 1b2f3287f7 (GoogleTest: Restore toleration
of odd test PROPERTIES count, 2026-07-30, v4.4.2~1^2).

Issue: #28004

Tests/RunCMake/GoogleTest/PropertiesOdd-stderr.txt

@@ -0,0 +1,7 @@
+^CMake Warning \(author\) at [^
+]*/Modules/GoogleTest.cmake:[0-9]+ \(message\):
+  PROPERTIES should be key-value pairs.  Ignoring unpaired key 'PROP2'.
+Call Stack \(most recent call first\):
+  PropertiesOdd.cmake:[0-9]+ \(gtest_discover_tests\)
+  CMakeLists.txt:[0-9]+ \(include\)
+This warning is for project developers\.  Use -Wno-author to suppress it\.$

Tests/RunCMake/GoogleTest/PropertiesOdd.cmake

@@ -0,0 +1,8 @@
+add_executable(example IMPORTED)
+set_property(TARGET example PROPERTY IMPORTED_LOCATION ${CMAKE_CURRENT_BINARY_DIR}/example)
+include(GoogleTest)
+gtest_discover_tests(example DISCOVERY_MODE PRE_TEST
+  PROPERTIES
+    PROP1 VAL1
+    PROP2 # no VAL2
+)

Tests/RunCMake/GoogleTest/RunCMakeTest.cmake

@@ -11,6 +11,8 @@ else()
   set(fs_delay 1.125)
 endif()
 
+run_cmake(PropertiesOdd)
+
 function(run_GoogleTest DISCOVERY_MODE)
   # Use a single build tree for a few tests without cleaning.
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/GoogleTest-build)