feat: NbpService & tests implementation

src/main/java/eu/ztsh/wymiana/service/NbpService.java

@@ -1,14 +1,17 @@
 package eu.ztsh.wymiana.service;
 
+import eu.ztsh.wymiana.exception.NoDataException;
 import eu.ztsh.wymiana.model.Rates;
 import lombok.RequiredArgsConstructor;
 import org.assertj.core.util.VisibleForTesting;
+import org.springframework.http.HttpStatusCode;
 import org.springframework.stereotype.Service;
 import org.springframework.web.client.RestClient;
 
 import java.time.Clock;
 import java.time.DayOfWeek;
 import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
 import java.time.temporal.TemporalAdjusters;
 
 /**
@@ -21,13 +24,14 @@ public class NbpService {
     private final Clock clock;
     private final RestClient restClient;
     private static final String URI_PATTERN = "/api/exchangerates/rates/c/{code}/{date}/";
+    private final DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd");
 
     public double getSellRate(String currency) {
-        throw new UnsupportedOperationException("Not implemented yet");
+        return fetchData(currency, dtf.format(getFetchDate())).getRates().get(0).getAsk();
     }
 
     public double getBuyRate(String currency) {
-        throw new UnsupportedOperationException("Not implemented yet");
+        return fetchData(currency, dtf.format(getFetchDate())).getRates().get(0).getBid();
     }
 
     /**
@@ -45,7 +49,12 @@ public class NbpService {
 
     @VisibleForTesting
     Rates fetchData(String code, String date) {
-        throw new UnsupportedOperationException("Not implemented yet");
+        return restClient.get().uri(URI_PATTERN, code.toLowerCase(), date)
+            .retrieve()
+            .onStatus(HttpStatusCode::is4xxClientError, ((request, response) -> {
+                throw new NoDataException(code, date);
+            }))
+            .body(Rates.class);
     }
 
     private static boolean isWeekend(LocalDate today) {

src/test/java/eu/ztsh/wymiana/service/NbpServiceTest.java

@@ -2,6 +2,7 @@ package eu.ztsh.wymiana.service;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.github.tomakehurst.wiremock.client.WireMock;
 import eu.ztsh.wymiana.EntityCreator;
 import eu.ztsh.wymiana.WireMockExtension;
 import eu.ztsh.wymiana.exception.NoDataException;
@@ -78,8 +79,12 @@ class NbpServiceTest {
         var date = dtf.format(updateClock(DayOfWeek.FRIDAY));
         var url = "/api/exchangerates/rates/c/usd/%s/".formatted(date);
         WireMockExtension.response(url, 200, new ObjectMapper().writeValueAsString(EntityCreator.rates(date)));
-        assertThat(nbpService.getSellRate(EntityCreator.Constants.USD_SYMBOL)).isEqualTo(EntityCreator.Constants.SELL_RATE);
+        try {
-        WireMockExtension.verifyGet(1, url);
+            assertThat(nbpService.getSellRate(EntityCreator.Constants.USD_SYMBOL)).isEqualTo(EntityCreator.Constants.SELL_RATE);
+            assertThat(nbpService.getBuyRate(EntityCreator.Constants.USD_SYMBOL)).isEqualTo(EntityCreator.Constants.BUY_RATE);
+        } finally {
+            WireMockExtension.verifyGet(2, url);
+        }
     }
 
     @DisplayName("Fetch rates from cache")
@@ -88,6 +93,7 @@ class NbpServiceTest {
         var date = dtf.format(updateClock(DayOfWeek.FRIDAY));
         var url = "/api/exchangerates/rates/c/usd/%s/".formatted(date);
         assertThat(nbpService.getSellRate(EntityCreator.Constants.USD_SYMBOL)).isEqualTo(EntityCreator.Constants.SELL_RATE);
+        assertThat(nbpService.getBuyRate(EntityCreator.Constants.USD_SYMBOL)).isEqualTo(EntityCreator.Constants.BUY_RATE);
         WireMockExtension.verifyGet(0, url);
     }