Add test for std::variant (#19)

Author: schmitts

tests/variant_parameters.cpp

@@ -0,0 +1,5 @@
+#include "variant_parameters.h"
+
+std::variant<int, std::string> foo(std::variant<int, std::string> v) {
+	return v;
+}

tests/variant_parameters.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#if !__has_include("variant")
+#include <experimental/variant>
+namespace std {
+template<typename T>
+using variant = std::experimental::variant<T>;
+}
+#else
+#include <variant>
+#endif
+
+#include "genpybind.h"
+
+#include <string>
+
+std::variant<int, std::string> GENPYBIND(visible) foo(std::variant<int, std::string>);

tests/variant_parameters_test.py

@@ -0,0 +1,7 @@
+import pytest
+import pyvariant_parameters as m
+
+def test_variant_parameters():
+    assert hasattr(m, 'foo')
+    assert m.foo(3) == 3
+    assert m.foo("s") == "s"