fix: ParameterizedTypeReference 사용 시 불필요한 중괄호 제거 및 null 체크 추가

Author: rnqhstmd

apps/commerce-api/src/test/java/com/loopers/interfaces/api/brand/BrandV1ApiE2ETest.java

@@ -57,7 +57,8 @@ void returnsBrandInfo_whenBrandExists() {
 
             // act
             ParameterizedTypeReference<ApiResponse<BrandV1Dto.BrandResponse>> responseType =
-                    new ParameterizedTypeReference<>() {};
+                    new ParameterizedTypeReference<>() {
+                    };
             ResponseEntity<ApiResponse<BrandV1Dto.BrandResponse>> response =
                     testRestTemplate.exchange(
                             ENDPOINT_GET_BRAND + "/" + brand.getId(),
@@ -82,7 +83,8 @@ void returnsBrandInfo_whenBrandExists() {
         void returnsNotFound_whenBrandDoesNotExist() {
             // act
             ParameterizedTypeReference<ApiResponse<BrandV1Dto.BrandResponse>> responseType =
-                    new ParameterizedTypeReference<>() {};
+                    new ParameterizedTypeReference<>() {
+                    };
             ResponseEntity<ApiResponse<BrandV1Dto.BrandResponse>> response =
                     testRestTemplate.exchange(
                             ENDPOINT_GET_BRAND + "/99999",
@@ -108,7 +110,8 @@ void returnsCorrectBrand_whenMultipleBrandsExist() {
 
             // act
             ParameterizedTypeReference<ApiResponse<BrandV1Dto.BrandResponse>> responseType =
-                    new ParameterizedTypeReference<>() {};
+                    new ParameterizedTypeReference<>() {
+                    };
             ResponseEntity<ApiResponse<BrandV1Dto.BrandResponse>> response =
                     testRestTemplate.exchange(
                             ENDPOINT_GET_BRAND + "/" + adidas.getId(),
@@ -120,6 +123,8 @@ void returnsCorrectBrand_whenMultipleBrandsExist() {
             // assert
             assertAll(
                     () -> assertTrue(response.getStatusCode().is2xxSuccessful()),
+                    () -> assertThat(response.getBody()).isNotNull(),
+                    () -> assertThat(response.getBody().data()).isNotNull(),
                     () -> assertThat(response.getBody().data().name()).isEqualTo("Adidas")
             );
         }