Add xtd::collections::generic::stack unit tests

Author: gammasoft71

tests/xtd.core.unit_tests/CMakeLists.txt

@@ -17,6 +17,7 @@ add_sources(
   "src/xtd/collections/generic/tests/linked_list_tests.cpp"
   "src/xtd/collections/generic/tests/list_tests.cpp"
   "src/xtd/collections/generic/tests/queue_tests.cpp"
+  "src/xtd/collections/generic/tests/stack_tests.cpp"
   "src/xtd/collections/tests/array_list_tests.cpp"
   "src/xtd/collections/tests/bit_array_tests.cpp"
   "src/xtd/configuration/tests/file_settings_tests.cpp"