test: NbpService#getFetchDate tests

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

@@ -1,32 +1,82 @@
 package eu.ztsh.wymiana.service;
 
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+import org.mockito.Mockito;
+
+import java.time.Clock;
+import java.time.DayOfWeek;
+import java.time.LocalDate;
+import java.time.Month;
+import java.time.ZoneId;
+import java.time.temporal.TemporalAdjusters;
+
+import static org.assertj.core.api.Assertions.assertThat;
 
 class NbpServiceTest {
 
-    @Test
-    void getFetchDateOnWorkingDayTest() {
+    private static final ZoneId zone = ZoneId.of("Europe/Warsaw");
+    private static final LocalDate today = LocalDate.of(2024, Month.MAY, 12); // Sunday
+    private static Clock clock;
+    private NbpService nbpService;
 
+    @BeforeAll
+    static void prepare() {
+        clock = Mockito.mock(Clock.class);
+        Mockito.when(clock.getZone()).thenReturn(zone);
     }
 
-    @Test
-    void getFetchDateOnWeekendTest() {
+    @BeforeEach
+    void prepareTest() {
+        nbpService = new NbpService(clock);
+    }
 
+    @ParameterizedTest
+    @EnumSource(value = DayOfWeek.class, names = {"SATURDAY","SUNDAY"}, mode = EnumSource.Mode.EXCLUDE)
+    void getFetchDateOnWorkingDayTest(DayOfWeek dayOfWeek) {
+        updateClock(dayOfWeek);
+        assertThat(nbpService.getFetchDate()).isEqualTo(
+            switch (dayOfWeek) {
+                case MONDAY -> LocalDate.of(2024, Month.MAY, 6);
+                case TUESDAY -> LocalDate.of(2024, Month.MAY, 7);
+                case WEDNESDAY -> LocalDate.of(2024, Month.MAY, 8);
+                case THURSDAY -> LocalDate.of(2024, Month.MAY, 9);
+                case FRIDAY -> LocalDate.of(2024, Month.MAY, 10);
+                default -> null;
+            }
+        );
+    }
+
+    @ParameterizedTest
+    @EnumSource(value = DayOfWeek.class, names = {"SATURDAY","SUNDAY"})
+    void getFetchDateOnWeekendTest(DayOfWeek dayOfWeek) {
+        updateClock(dayOfWeek);
+        assertThat(nbpService.getFetchDate()).isEqualTo(LocalDate.of(2024, Month.MAY, 10));
     }
 
     @Test
     void getWithoutCacheTest() {
-
+        throw new UnsupportedOperationException("Not implemented yet");
     }
 
     @Test
     void getWithCacheTest() {
-
+        throw new UnsupportedOperationException("Not implemented yet");
     }
 
     @Test
     void getInvalidCurrencyTest() {
+        throw new UnsupportedOperationException("Not implemented yet");
+    }
 
+    private void updateClock(DayOfWeek dayOfWeek) {
+        Mockito.when(clock.instant()).thenReturn(
+            today.with(TemporalAdjusters.previousOrSame(dayOfWeek))
+                .atStartOfDay(zone)
+                .toInstant());
     }
 
 }