Fix clock difference

Author: BewareMyPower

tests/MockClientImpl.h

@@ -41,10 +41,10 @@ class MockClientImpl : public ClientImpl {
 
     SyncOpResult createProducer(const std::string& topic) {
         using namespace std::chrono;
-        auto start = std::chrono::high_resolution_clock::now();
+        auto start = high_resolution_clock::now();
         std::promise<SyncOpResult> promise;
         createProducerAsync(topic, {}, [&start, &promise](Result result, Producer) {
-            auto timeMs = duration_cast<std::chrono::milliseconds>(steady_clock::now() - start).count();
+            auto timeMs = duration_cast<milliseconds>(high_resolution_clock::now() - start).count();
             promise.set_value({result, timeMs});
         });
         return promise.get_future().get();
@@ -55,7 +55,7 @@ class MockClientImpl : public ClientImpl {
         auto start = std::chrono::high_resolution_clock::now();
         std::promise<SyncOpResult> promise;
         subscribeAsync(topic, "sub", {}, [&start, &promise](Result result, Consumer) {
-            auto timeMs = duration_cast<std::chrono::milliseconds>(steady_clock::now() - start).count();
+            auto timeMs = duration_cast<milliseconds>(high_resolution_clock::now() - start).count();
             promise.set_value({result, timeMs});
         });
         return promise.get_future().get();