diff --git a/tests/src/mocks/metric_mock.hpp b/tests/src/mocks/metric_mock.hpp
index 98bad87..2f31f1e 100644
--- a/tests/src/mocks/metric_mock.hpp
+++ b/tests/src/mocks/metric_mock.hpp
@@ -11,13 +11,12 @@
     {
         using namespace testing;
 
-        ON_CALL(*this, getReadings())
-            .WillByDefault(ReturnRefOfCopy(std::vector<MetricValue>()));
+        ON_CALL(*this, getReading())
+            .WillByDefault(ReturnRefOfCopy(MetricValue()));
     }
 
     MOCK_METHOD(void, initialize, (), (override));
-    MOCK_METHOD(const std::vector<MetricValue>&, getReadings, (),
-                (const, override));
+    MOCK_METHOD(const MetricValue&, getReading, (), (const, override));
     MOCK_METHOD(LabeledMetricParameters, dumpConfiguration, (),
                 (const, override));
 };