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diff --git a/deps/sol2/tests/runtime_tests/source/environments.cpp b/deps/sol2/tests/runtime_tests/source/environments.cpp
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+++ b/deps/sol2/tests/runtime_tests/source/environments.cpp
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+// sol3 
+
+// The MIT License (MIT)
+
+// Copyright (c) 2013-2019 Rapptz, ThePhD and contributors
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#include "sol_test.hpp"
+
+#include <catch.hpp>
+
+#include <iostream>
+
+TEST_CASE("environments/get", "Envronments can be taken out of things like Lua functions properly") {
+	sol::state lua;
+	sol::stack_guard luasg(lua);
+
+	lua.open_libraries(sol::lib::base);
+
+	auto result1 = lua.safe_script("f = function() return test end", sol::script_pass_on_error);
+	REQUIRE(result1.valid());
+	sol::function f = lua["f"];
+
+	sol::environment env_f(lua, sol::create);
+	env_f["test"] = 31;
+	sol::set_environment(env_f, f);
+
+	int result = f();
+	REQUIRE(result == 31);
+
+	auto result2 = lua.safe_script("g = function() test = 5 end", sol::script_pass_on_error);
+	REQUIRE(result2.valid());
+	sol::function g = lua["g"];
+	sol::environment env_g(lua, sol::create);
+	env_g.set_on(g);
+
+	g();
+
+	int test = env_g["test"];
+	REQUIRE(test == 5);
+
+	sol::object global_test = lua["test"];
+	REQUIRE(!global_test.valid());
+
+	auto result3 = lua.safe_script("h = function() end", sol::script_pass_on_error);
+	REQUIRE(result3.valid());
+
+	lua.set_function("check_f_env",
+		[&lua, &env_f](sol::object target) {
+			sol::stack_guard luasg(lua);
+			sol::environment target_env(sol::env_key, target);
+			int test_env_f = env_f["test"];
+			int test_target_env = target_env["test"];
+			REQUIRE(test_env_f == test_target_env);
+			REQUIRE(test_env_f == 31);
+			REQUIRE(env_f == target_env);
+		});
+	lua.set_function("check_g_env",
+		[&lua, &env_g](sol::function target) {
+			sol::stack_guard luasg(lua);
+			sol::environment target_env = sol::get_environment(target);
+			int test_env_g = env_g["test"];
+			int test_target_env = target_env["test"];
+			REQUIRE(test_env_g == test_target_env);
+			REQUIRE(test_env_g == 5);
+			REQUIRE(env_g == target_env);
+		});
+	lua.set_function("check_h_env",
+		[&lua](sol::function target) {
+			sol::stack_guard luasg(lua);
+			sol::environment target_env = sol::get_environment(target);
+		});
+
+	auto checkf = lua.safe_script("check_f_env(f)");
+	REQUIRE(checkf.valid());
+	auto checkg = lua.safe_script("check_g_env(g)");
+	REQUIRE(checkg.valid());
+	auto checkh = lua.safe_script("check_h_env(h)");
+	REQUIRE(checkh.valid());
+}
+
+TEST_CASE("environments/shadowing", "Environments can properly shadow and fallback on variables") {
+
+	sol::state lua;
+	sol::stack_guard luasg(lua);
+
+	lua["b"] = 2142;
+
+	SECTION("no fallback") {
+		sol::environment plain_env(lua, sol::create);
+		auto result1 = lua.safe_script("a = 24", plain_env, sol::script_pass_on_error);
+		REQUIRE(result1.valid());
+		sol::optional<int> maybe_env_a = plain_env["a"];
+		sol::optional<int> maybe_global_a = lua["a"];
+		sol::optional<int> maybe_env_b = plain_env["b"];
+		sol::optional<int> maybe_global_b = lua["b"];
+
+		REQUIRE(maybe_env_a != sol::nullopt);
+		REQUIRE(maybe_env_a.value() == 24);
+		REQUIRE(maybe_env_b == sol::nullopt);
+
+		REQUIRE(maybe_global_a == sol::nullopt);
+		REQUIRE(maybe_global_b != sol::nullopt);
+		REQUIRE(maybe_global_b.value() == 2142);
+	}
+	SECTION("fallback") {
+		sol::environment env_with_fallback(lua, sol::create, lua.globals());
+		auto result1 = lua.safe_script("a = 56", env_with_fallback, sol::script_pass_on_error);
+		REQUIRE(result1.valid());
+		sol::optional<int> maybe_env_a = env_with_fallback["a"];
+		sol::optional<int> maybe_global_a = lua["a"];
+		sol::optional<int> maybe_env_b = env_with_fallback["b"];
+		sol::optional<int> maybe_global_b = lua["b"];
+
+		REQUIRE(maybe_env_a != sol::nullopt);
+		REQUIRE(maybe_env_a.value() == 56);
+		REQUIRE(maybe_env_b != sol::nullopt);
+		REQUIRE(maybe_env_b.value() == 2142);
+
+		REQUIRE(maybe_global_a == sol::nullopt);
+		REQUIRE(maybe_global_b != sol::nullopt);
+		REQUIRE(maybe_global_b.value() == 2142);
+	}
+	SECTION("from name") {
+		sol::environment env_with_fallback(lua, sol::create, lua.globals());
+		lua["env"] = env_with_fallback;
+		sol::environment env = lua["env"];
+		auto result1 = lua.safe_script("a = 56", env, sol::script_pass_on_error);
+		REQUIRE(result1.valid());
+		sol::optional<int> maybe_env_a = env["a"];
+		sol::optional<int> maybe_global_a = lua["a"];
+		sol::optional<int> maybe_env_b = env["b"];
+		sol::optional<int> maybe_global_b = lua["b"];
+
+		REQUIRE(maybe_env_a != sol::nullopt);
+		REQUIRE(maybe_env_a.value() == 56);
+		REQUIRE(maybe_env_b != sol::nullopt);
+		REQUIRE(maybe_env_b.value() == 2142);
+
+		REQUIRE(maybe_global_a == sol::nullopt);
+		REQUIRE(maybe_global_b != sol::nullopt);
+		REQUIRE(maybe_global_b.value() == 2142);
+	}
+	SECTION("name with newtable") {
+		lua["blank_env"] = sol::new_table(0, 1);
+		sol::environment plain_env = lua["blank_env"];
+		auto result1 = lua.safe_script("a = 24", plain_env, sol::script_pass_on_error);
+		REQUIRE(result1.valid());
+
+		sol::optional<int> maybe_env_a = plain_env["a"];
+		sol::optional<int> maybe_global_a = lua["a"];
+		sol::optional<int> maybe_env_b = plain_env["b"];
+		sol::optional<int> maybe_global_b = lua["b"];
+
+		REQUIRE(maybe_env_a != sol::nullopt);
+		REQUIRE(maybe_env_a.value() == 24);
+		REQUIRE(maybe_env_b == sol::nullopt);
+
+		REQUIRE(maybe_global_a == sol::nullopt);
+		REQUIRE(maybe_global_b != sol::nullopt);
+		REQUIRE(maybe_global_b.value() == 2142);
+	}
+}
+
+TEST_CASE("environments/functions", "see if environments on functions are working properly") {
+
+	SECTION("basic") {
+		sol::state lua;
+		sol::stack_guard luasg(lua);
+
+		auto result1 = lua.safe_script("a = function() return 5 end", sol::script_pass_on_error);
+		REQUIRE(result1.valid());
+
+		sol::function a = lua["a"];
+
+		int result0 = a();
+		REQUIRE(result0 == 5);
+
+		sol::environment env(lua, sol::create);
+		sol::set_environment(env, a);
+
+		int value = a();
+		REQUIRE(value == 5);
+	}
+	SECTION("return environment value") {
+		sol::state lua;
+		sol::stack_guard luasg(lua);
+
+		auto result1 = lua.safe_script("a = function() return test end", sol::script_pass_on_error);
+		REQUIRE(result1.valid());
+
+		sol::function a = lua["a"];
+		sol::environment env(lua, sol::create);
+		env["test"] = 5;
+		env.set_on(a);
+
+		// the function returns the value from the environment table
+		int result = a();
+		REQUIRE(result == 5);
+	}
+
+	SECTION("set environment value") {
+		sol::state lua;
+		sol::stack_guard luasg(lua);
+
+		auto result1 = lua.safe_script("a = function() test = 5 end", sol::script_pass_on_error);
+		REQUIRE(result1.valid());
+
+		sol::function a = lua["a"];
+		sol::environment env(lua, sol::create);
+		sol::set_environment(env, a);
+
+		a();
+
+		// the value can be retrieved from the env table
+		int result = env["test"];
+		REQUIRE(result == 5);
+
+		// the global environment is not polluted
+		auto gtest = lua["test"];
+		REQUIRE(!gtest.valid());
+	}
+}
+
+TEST_CASE("environments/this_environment", "test various situations of pulling out an environment") {
+	static std::string code = "return (f(10))";
+
+	sol::state lua;
+	sol::stack_guard luasg(lua);
+
+	lua["f"] = [](sol::this_environment te, int x, sol::this_state ts) {
+		if (te) {
+			sol::environment& env = te;
+			return x + static_cast<int>(env["x"]);
+		}
+		sol::state_view lua = ts;
+		return x + static_cast<int>(lua["x"]);
+	};
+
+	sol::environment e(lua, sol::create, lua.globals());
+	lua["x"] = 5;
+	e["x"] = 20;
+	SECTION("from Lua script") {
+		auto result1 = lua.safe_script(code, e, sol::script_pass_on_error);
+		REQUIRE(result1.valid());
+		int value = result1;
+		REQUIRE(value == 30);
+	}
+	SECTION("from C++") {
+		sol::function f = lua["f"];
+		e.set_on(f);
+		int value = f(10);
+		REQUIRE(value == 30);
+	}
+	SECTION("from C++, with no env") {
+		sol::function f = lua["f"];
+		int value = f(10);
+		REQUIRE(value == 15);
+	}
+}