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diff --git a/log_test.cc b/log_test.cc
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+++ b/log_test.cc
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+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#include "log.h"
+
+#include <iostream>
+#include <sstream>
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+namespace gsrsup {
+namespace {
+
+using ::testing::HasSubstr;
+using ::testing::IsEmpty;
+
+TEST(LogTest, FormatsProgramAndMessage) {
+  std::ostringstream s;
+  Log("program", s).Message(Log::kInfo, "message");
+  EXPECT_EQ(s.str(), "program: message\n");
+}
+
+TEST(LogTest, FormatsLevelDebug) {
+  std::ostringstream s;
+  Log("program", Log::kDebug, s).Message(Log::kDebug, "message");
+  EXPECT_THAT(s.str(), HasSubstr("debug:"));
+}
+
+TEST(LogTest, FormatsLevelWarning) {
+  std::ostringstream s;
+  Log("program", s).Message(Log::kWarning, "message");
+  EXPECT_THAT(s.str(), HasSubstr("warning:"));
+}
+
+TEST(LogTest, FormatsLevelError) {
+  std::ostringstream s;
+  Log("program", s).Message(Log::kError, "message");
+  EXPECT_THAT(s.str(), HasSubstr("error:"));
+}
+
+TEST(LogTest, HidesUninterestingMessages) {
+  std::ostringstream s;
+  Log("program", Log::kError, s).Message(Log::kDebug, "some debug message");
+  EXPECT_THAT(s.str(), IsEmpty());
+}
+
+}  // namespace
+}  // namespace gsrsup