1 files changed, 82 insertions, 0 deletions
diff --git a/nihil.ucl/tests/emit.cc b/nihil.ucl/tests/emit.cc
index 13f5914..c7f9757 100644
--- a/nihil.ucl/tests/emit.cc
+++ b/nihil.ucl/tests/emit.cc
@@ -2,7 +2,89 @@
  * This source code is released into the public domain.
  */
 
+#include <format>
+#include <sstream>
+
 #include <catch2/catch_test_macros.hpp>
 
 import nihil;
 import nihil.ucl;
+
+TEST_CASE("ucl: emit to std::ostream", "[ucl]")
+{
+	using namespace std::literals;
+
+	auto obj = nihil::ucl::parse("int = [1, 42, 666]"sv);
+	auto strm = std::ostringstream();
+	strm << obj;
+
+	REQUIRE(strm.str() ==
+"{\n"
+"    \"int\": [\n"
+"        1,\n"
+"        42,\n"
+"        666\n"
+"    ]\n"
+"}");
+}
+
+TEST_CASE("ucl: emit JSON with std::format", "[ucl]")
+{
+	using namespace std::literals;
+
+	auto obj = nihil::ucl::parse("int = [1, 42, 666]"sv);
+	auto str = std::format("{:j}", obj);
+
+	REQUIRE(str ==
+"{\n"
+"    \"int\": [\n"
+"        1,\n"
+"        42,\n"
+"        666\n"
+"    ]\n"
+"}");
+
+	// Make sure JSON is the default format.
+	auto str2 = std::format("{}", obj);
+	REQUIRE(str == str2);
+}
+
+TEST_CASE("ucl: emit compact JSON with std::format", "[ucl]")
+{
+	using namespace std::literals;
+
+	auto obj = nihil::ucl::parse("int = [1, 42, 666]"sv);
+	auto str = std::format("{:J}", obj);
+
+	REQUIRE(str == "{\"int\":[1,42,666]}");
+}
+
+TEST_CASE("ucl: emit configuration with std::format", "[ucl]")
+{
+	using namespace std::literals;
+
+	auto obj = nihil::ucl::parse("int = [1, 42, 666]"sv);
+	auto str = std::format("{:c}", obj);
+
+	REQUIRE(str ==
+"int [\n"
+"    1,\n"
+"    42,\n"
+"    666,\n"
+"]\n");
+}
+
+TEST_CASE("ucl: emit YAML with std::format", "[ucl]")
+{
+	using namespace std::literals;
+
+	auto obj = nihil::ucl::parse("int = [1, 42, 666]"sv);
+	auto str = std::format("{:y}", obj);
+
+	REQUIRE(str ==
+"int: [\n"
+"    1,\n"
+"    42,\n"
+"    666\n"
+"]");
+}