feat add sigslot test case

CMakeLists.txt

@@ -188,6 +188,7 @@ if(SLED_BUILD_TESTS)
                 src/sled/utility/move_on_copy_test.cc)
   sled_add_test(NAME sled_symbolize_test SRCS
                 src/sled/debugging/symbolize_test.cc NO_MAIN)
+  sled_add_test(NAME sled_sigslot_test SRCS src/sled/sigslot_test.cc)
 endif(SLED_BUILD_TESTS)
 
 if(SLED_BUILD_FUZZ)

src/sled/sigslot_test.cc

@@ -0,0 +1,16 @@
+#include <sled/sigslot.h>
+
+struct DeleteSelf : public sigslot::has_slots<> {
+    void DeleteThis() {
+        delete this;
+    }
+};
+
+TEST_SUITE("sigslot") {
+    TEST_CASE("delete this") {
+        DeleteSelf* d = new DeleteSelf();
+        sigslot::signal0<> sig;
+        sig.connect(d, &DeleteSelf::DeleteThis);
+        sig.emit();
+    }
+}