copy wangle back into folly

[folly.git] / folly / wangle / concurrent / test / CodelTest.cpp

diff --git a/folly/wangle/concurrent/test/CodelTest.cpp b/folly/wangle/concurrent/test/CodelTest.cpp
new file mode 100644 (file)
index 0000000..fd420ba
--- /dev/null
+++ b/folly/wangle/concurrent/test/CodelTest.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2015 Facebook, Inc.
+ *
+ * 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
+ *
+ *   http://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 <chrono>
+#include <folly/wangle/concurrent/Codel.h>
+#include <gtest/gtest.h>
+#include <thread>
+
+TEST(CodelTest, Basic) {
+  using std::chrono::milliseconds;
+  folly::wangle::Codel c;
+  std::this_thread::sleep_for(milliseconds(110));
+  // This interval is overloaded
+  EXPECT_FALSE(c.overloaded(milliseconds(100)));
+  std::this_thread::sleep_for(milliseconds(90));
+  // At least two requests must happen in an interval before they will fail
+  EXPECT_FALSE(c.overloaded(milliseconds(50)));
+  EXPECT_TRUE(c.overloaded(milliseconds(50)));
+  std::this_thread::sleep_for(milliseconds(110));
+  // Previous interval is overloaded, but 2ms isn't enough to fail
+  EXPECT_FALSE(c.overloaded(milliseconds(2)));
+  std::this_thread::sleep_for(milliseconds(90));
+  // 20 ms > target interval * 2
+  EXPECT_TRUE(c.overloaded(milliseconds(20)));
+}