Add tests for variant array creation.

Author: greg7mdp

libraries/libfc/test/variant/test_variant.cpp

@@ -211,4 +211,56 @@ BOOST_AUTO_TEST_CASE(bitset_test)
    check_variant_round_trip(fc::bitset("01110011010100101111001101100100100111111111111111111001"));
 }
 
+BOOST_AUTO_TEST_CASE(array) {
+   // check that variant arrays can be created or updated from:
+   //  - `std::initializer_list`
+   //  - `std::vector`
+   //  - `std::array`
+   // --------------------------------------------------------------------------------------------
+   auto check_variant_round_trip = []<class C>(const C& arr) {
+      fc::variant m(arr);
+
+      std::vector<int> v;
+      fc::from_variant(m, v);
+      auto expected = std::vector<int>{arr.begin(), arr.end()};
+      BOOST_TEST(v == expected);
+   };
+
+   check_variant_round_trip(std::initializer_list<int>{});
+   check_variant_round_trip(std::initializer_list<int>{1, 2, 3});
+
+   check_variant_round_trip(std::vector<int>{});
+   check_variant_round_trip(std::vector<int>{1, 2, 3});
+
+   check_variant_round_trip(std::array<int, 0>{});
+   check_variant_round_trip(std::array{1, 2, 3});
+
+   // check that mutable_variant_object arrays can be created or updated from:
+   //  - `std::initializer_list`
+   //  - `std::vector`
+   //  - `std::array`
+   // --------------------------------------------------------------------------------------------
+   auto check_variant_round_trip2 = []<class C>(const C& arr) {
+      fc::mutable_variant_object mu("a", arr);
+
+      std::vector<int> v;
+      fc::from_variant(mu["a"], v);
+      auto expected = std::vector<int>{arr.begin(), arr.end()};
+      BOOST_TEST(v == expected);
+
+      auto mu2 = fc::mutable_variant_object()("b", arr); // also test mutable_variant_object operator()
+      fc::from_variant(mu2["b"], v);
+      BOOST_TEST(v == expected);
+   };
+
+   check_variant_round_trip2(std::initializer_list<int>{});
+   check_variant_round_trip2(std::initializer_list<int>{1, 2, 3});
+
+   check_variant_round_trip2(std::vector<int>{});
+   check_variant_round_trip2(std::vector<int>{1, 2, 3});
+
+   check_variant_round_trip2(std::array<int, 0>{});
+   check_variant_round_trip2(std::array{1, 2, 3});
+}
+
 BOOST_AUTO_TEST_SUITE_END()