test: NbpService#getFetchDate tests

src/main/java/eu/ztsh/wymiana/config/ClockConfiguration.java

@@ -0,0 +1,16 @@
+package eu.ztsh.wymiana.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.time.Clock;
+
+@Configuration
+public class ClockConfiguration {
+
+    @Bean
+    public Clock clock() {
+        return Clock.systemDefaultZone();
+    }
+
+}