Fix linting issues

internal/app/s3manager/bucket_view_test.go

@@ -1,7 +1,6 @@
 package s3manager_test
 
 import (
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -97,7 +96,7 @@ func TestHandleBucketView(t *testing.T) {
 			listObjectsV2Func: func(string, string, bool, <-chan struct{}) <-chan minio.ObjectInfo {
 				objCh := make(chan minio.ObjectInfo)
 				go func() {
-					objCh <- minio.ObjectInfo{Err: errors.New("The specified bucket does not exist")}
+					objCh <- minio.ObjectInfo{Err: errBucketDoesNotExist}
 					close(objCh)
 				}()
 				return objCh
@@ -111,7 +110,7 @@ func TestHandleBucketView(t *testing.T) {
 			listObjectsV2Func: func(string, string, bool, <-chan struct{}) <-chan minio.ObjectInfo {
 				objCh := make(chan minio.ObjectInfo)
 				go func() {
-					objCh <- minio.ObjectInfo{Err: errors.New("mocked S3 error")}
+					objCh <- minio.ObjectInfo{Err: errS3}
 					close(objCh)
 				}()
 				return objCh

internal/app/s3manager/buckets_view_test.go

@@ -1,7 +1,6 @@
 package s3manager_test
 
 import (
-	"errors"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -41,7 +40,7 @@ func TestHandleBucketsView(t *testing.T) {
 		{
 			it: "returns error if there is an S3 error",
 			listBucketsFunc: func() ([]minio.BucketInfo, error) {
-				return []minio.BucketInfo{}, errors.New("mocked S3 error")
+				return []minio.BucketInfo{}, errS3
 			},
 			expectedStatusCode:   http.StatusInternalServerError,
 			expectedBodyContains: http.StatusText(http.StatusInternalServerError),

internal/app/s3manager/create_bucket_test.go

@@ -2,7 +2,6 @@ package s3manager_test
 
 import (
 	"bytes"
-	"errors"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -52,7 +51,7 @@ func TestHandleCreateBucket(t *testing.T) {
 		{
 			it: "returns error if there is an S3 error",
 			makeBucketFunc: func(string, string) error {
-				return errors.New("mocked S3 error")
+				return errS3
 			},
 			body:                 `{"name":"myBucket"}`,
 			expectedStatusCode:   http.StatusInternalServerError,

internal/app/s3manager/delete_bucket_test.go

@@ -1,7 +1,6 @@
 package s3manager_test
 
 import (
-	"errors"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -31,7 +30,7 @@ func TestHandleDeleteBucket(t *testing.T) {
 		{
 			it: "returns error if there is an S3 error",
 			removeBucketFunc: func(string) error {
-				return errors.New("mocked S3 error")
+				return errS3
 			},
 			expectedStatusCode:   http.StatusInternalServerError,
 			expectedBodyContains: http.StatusText(http.StatusInternalServerError),

internal/app/s3manager/delete_object_test.go

@@ -1,7 +1,6 @@
 package s3manager_test
 
 import (
-	"errors"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -30,7 +29,7 @@ func TestHandleDeleteObject(t *testing.T) {
 		{
 			it: "returns error if there is an S3 error",
 			removeObjectFunc: func(string, string) error {
-				return errors.New("mocked S3 error")
+				return errS3
 			},
 			expectedStatusCode:   http.StatusInternalServerError,
 			expectedBodyContains: http.StatusText(http.StatusInternalServerError),

internal/app/s3manager/errors_test.go

@@ -0,0 +1,8 @@
+package s3manager_test
+
+import "errors"
+
+var (
+	errS3                 = errors.New("mocked s3 error")
+	errBucketDoesNotExist = errors.New("The specified bucket does not exist") // nolint: stylecheck
+)

internal/app/s3manager/get_object_test.go

@@ -1,7 +1,6 @@
 package s3manager_test
 
 import (
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -28,7 +27,7 @@ func TestHandleGetObject(t *testing.T) {
 		{
 			it: "returns error if there is an S3 error",
 			getObjectFunc: func(string, string, minio.GetObjectOptions) (*minio.Object, error) {
-				return nil, errors.New("mocked S3 error")
+				return nil, errS3
 			},
 			bucketName:           "testBucket",
 			objectName:           "testObject",