1 files changed, 44 insertions, 0 deletions
diff --git a/test/std/containers/unord/unord.set/contains.pass.cpp b/test/std/containers/unord/unord.set/contains.pass.cpp
new file mode 100644
index 000000000..3b87f2fd0
--- /dev/null
+++ b/test/std/containers/unord/unord.set/contains.pass.cpp
@@ -0,0 +1,44 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+#include <cassert>
+#include <unordered_set>
+
+// <unordered_set>
+
+// bool contains(const key_type& x) const;
+
+template <typename T, typename V, typename B, typename... Vals>
+void test(B bad, Vals... args) {
+    T set;
+    V vals[] = {args...};
+
+    for (auto& v : vals) set.insert(v);
+    for (auto& v : vals) assert(set.contains(v));
+
+    assert(!set.contains(bad));
+}
+
+struct E { int a = 1; double b = 1; char c = 1; };
+
+int main(int, char**)
+{
+    {
+        test<std::unordered_set<int>, int>(14, 10, 11, 12, 13);
+        test<std::unordered_set<char>, char>('e', 'a', 'b', 'c', 'd');
+    }
+    {
+        test<std::unordered_multiset<int>, int>(14, 10, 11, 12, 13);
+        test<std::unordered_multiset<char>, char>('e', 'a', 'b', 'c', 'd');
+    }
+
+    return 0;
+}
+