1 files changed, 32 insertions, 0 deletions
diff --git a/util/json/json_writer_unittest.cc b/util/json/json_writer_unittest.cc
new file mode 100644
index 00000000..8b75c82e
--- /dev/null
+++ b/util/json/json_writer_unittest.cc
@@ -0,0 +1,32 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "util/json/json_writer.h"
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "platform/base/error.h"
+
+namespace openscreen {
+
+TEST(JsonWriterTest, NullValueReturnsError) {
+  JsonWriter writer;
+
+  const auto null_value = Json::Value();
+  const auto actual = writer.Write(null_value);
+
+  EXPECT_TRUE(actual.is_error());
+  EXPECT_EQ(actual.error().code(), Error::Code::kJsonWriteError);
+}
+
+TEST(JsonWriterTest, ValidValueReturnsString) {
+  JsonWriter writer;
+
+  const Json::Int64 value = 31337;
+  const auto actual = writer.Write(value);
+
+  EXPECT_TRUE(actual.is_value());
+  EXPECT_EQ(actual.value(), "31337\n");
+}
+}  // namespace openscreen