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diff --git a/nihil.guard/test.cc b/nihil.guard/test.cc
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+++ b/nihil.guard/test.cc
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+/*
+ * This source code is released into the public domain.
+ */
+
+#include <catch2/catch_test_macros.hpp>
+
+import nihil.guard;
+
+using namespace std::literals;
+
+TEST_CASE("guard: basic", "[guard]") {
+	int n = 0;
+
+	{
+		auto guard = nihil::guard([&] { n = 1; });
+		REQUIRE(n == 0);
+	}
+
+	REQUIRE(n == 1);
+}