test: VoucherService 바우처 조회 테스트 추가

src/test/java/com/programmers/vouchermanagement/voucher/application/VoucherServiceTest.java

@@ -0,0 +1,50 @@
+package com.programmers.vouchermanagement.voucher.application;
+
+import com.programmers.vouchermanagement.voucher.domain.FixedAmountVoucher;
+import com.programmers.vouchermanagement.voucher.domain.PercentDiscountVoucher;
+import com.programmers.vouchermanagement.voucher.domain.Voucher;
+import com.programmers.vouchermanagement.voucher.domain.VoucherRepository;
+import com.programmers.vouchermanagement.voucher.dto.VoucherDto;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+@ExtendWith(MockitoExtension.class)
+class VoucherServiceTest {
+
+    @InjectMocks
+    private VoucherService voucherService;
+
+    @Mock
+    private VoucherRepository voucherRepository;
+
+    @Test
+    @DisplayName("바우처를 모두 조회한다.")
+    void getVouchers() {
+        // given
+        Voucher voucher1 = new FixedAmountVoucher(5000);
+        Voucher voucher2 = new PercentDiscountVoucher(10);
+
+        given(voucherRepository.findAll())
+                .willReturn(List.of(voucher1, voucher2));
+
+        // when
+        VoucherDto.Response result = voucherService.getVouchers();
+
+        // then
+        assertThat(result.voucherName()).hasSize(2);
+
+        // verify
+        verify(voucherRepository, times(1)).findAll();
+    }
+}