chore: import upstream snapshot with attribution

test/synchronous_event_unittest.cpp

@@ -0,0 +1,74 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 <gtest/gtest.h>
+#include "butil/synchronous_event.h"
+
+namespace {
+class SynchronousEventTest : public ::testing::Test{
+protected:
+    SynchronousEventTest(){
+    };
+    virtual ~SynchronousEventTest(){};
+    virtual void SetUp() {
+        srand(time(0));
+    };
+    virtual void TearDown() {
+    };
+};
+
+struct Foo {};
+
+typedef butil::SynchronousEvent<int, int*> FooEvent;
+
+FooEvent foo_event;
+std::vector<std::pair<int, int> > result;
+
+class FooObserver : public FooEvent::Observer {
+public:
+    FooObserver() : another_ob(NULL) {}
+    
+    void on_event(int x, int* p) {
+        ++*p;
+        result.push_back(std::make_pair(x, *p));
+        if (another_ob) {
+            foo_event.subscribe(another_ob);
+        }
+    }
+    FooObserver* another_ob;
+};
+
+
+TEST_F(SynchronousEventTest, sanity) {
+    const size_t N = 10;
+    FooObserver foo_observer;
+    FooObserver foo_observer2;
+    foo_observer.another_ob = &foo_observer2;
+    foo_event.subscribe(&foo_observer);
+    int v = 0;
+    result.clear();
+    for (size_t i = 0; i < N; ++i) {
+        foo_event.notify(i, &v);
+    }
+    ASSERT_EQ(2*N, result.size());
+    for (size_t i = 0; i < 2*N; ++i) {
+        ASSERT_EQ((int)i/2, result[i].first);
+        ASSERT_EQ((int)i+1, result[i].second);
+    }
+}
+
+}