test: fix type deduction failure on AL2

Author: yhabteab

test/base-json.cpp

@@ -37,8 +37,8 @@ BOOST_AUTO_TEST_CASE(encode)
 		{ "string", "LF\nTAB\tAUml\xC3\xA4Ill\xC3" },
 		{ "true", true },
 		{ "uint", 23u },
-		{ "generator", new ValueGenerator(vec, generate) },
-		{ "empty_generator", new ValueGenerator(empty, [](int) -> std::optional<Value> { return std::nullopt; }) },
+		{ "generator", new ValueGenerator{vec, generate} },
+		{ "empty_generator", new ValueGenerator{empty, [](int) -> std::optional<Value> { return std::nullopt; }} },
 	}));
 
 	String output (R"EOF({
@@ -67,7 +67,7 @@ BOOST_AUTO_TEST_CASE(encode)
 
 	auto got(JsonEncode(input, true));
 	BOOST_CHECK_EQUAL(output, got);
-	input->Set("generator", new ValueGenerator(vec, generate));
+	input->Set("generator", new ValueGenerator{vec, generate});
 
 	std::ostringstream oss;
 	JsonEncode(input, oss, true);
@@ -77,7 +77,7 @@ BOOST_AUTO_TEST_CASE(encode)
 	boost::algorithm::replace_all(output, "Objectoftype'Function'", "Object of type 'Function'");
 	boost::algorithm::replace_all(output, "\n", "");
 
-	input->Set("generator", new ValueGenerator(vec, generate));
+	input->Set("generator", new ValueGenerator{vec, generate});
 	BOOST_CHECK(JsonEncode(input, false) == output);
 }