diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3aa4f53..2a9d0d9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,15 +51,15 @@ if (COPPER_ENABLE_TESTS)
     target_compile_features(copper_tests PRIVATE cxx_std_20)
     if (NOT COPPER_ENABLE_FLAKY_TESTS)
         target_compile_definitions(copper_tests PRIVATE "COPPER_DISABLE_FLAKY_TESTS")
-    endif()
+    endif ()
     if (COPPER_COLLECT_TEST_COVERAGE)
         target_compile_options(copper_tests PRIVATE "--coverage")
         target_link_options(copper_tests PRIVATE "--coverage")
-    endif()
+    endif ()
     if (MSVC)
         target_compile_options(copper_tests PRIVATE "/bigobj")
-    endif()
+    endif ()
 
     enable_testing()
     add_test(copper_tests copper_tests)
-endif()
+endif ()
diff --git a/tests/channels/test_special_cases.cpp b/tests/channels/test_special_cases.cpp
new file mode 100644
index 0000000..40cee73
--- /dev/null
+++ b/tests/channels/test_special_cases.cpp
@@ -0,0 +1,24 @@
+/**
+ * Tests for special cases, e.g. regression tests for former bugs.
+ */
+
+#include "../util.h"
+#include <string>
+#include <thread>
+
+CHANNEL_TEST_CASE("GitHub Issue #23", "[copper]") {
+    {
+		copper::buffered_channel<std::string> channel;
+        std::vector<std::thread*> ths;
+        for (size_t i = 0; i < 5; i++) {
+            ths.push_back(new std::thread([&]() {
+                for (auto& item : channel) {
+                }
+            }));
+        }
+        channel.close();
+        for (auto item : ths) {
+            item->join();
+        }
+    }
+}
\ No newline at end of file