diff --git a/admin_test.go b/admin_test.go
index 47172a3..6648993 100644
--- a/admin_test.go
+++ b/admin_test.go
@@ -64,7 +64,7 @@ func Test_GetAdminQueriesOutdated_IOErr(t *testing.T) {
 	defer httpmock.DeactivateAndReset()
 
 	httpmock.RegisterResponder(http.MethodGet, "https://redash.example.com/api/admin/queries/outdated", func(req *http.Request) (*http.Response, error) {
-		return ioErrResp, nil
+		return testIOErrResp, nil
 	})
 
 	client, _ := redash.NewClient("https://redash.example.com", testRedashAPIKey)
@@ -261,7 +261,7 @@ func Test_GetAdminQueriesRqStatus_IOErr(t *testing.T) {
 	defer httpmock.DeactivateAndReset()
 
 	httpmock.RegisterResponder(http.MethodGet, "https://redash.example.com/api/admin/queries/rq_status", func(req *http.Request) (*http.Response, error) {
-		return ioErrResp, nil
+		return testIOErrResp, nil
 	})
 
 	client, _ := redash.NewClient("https://redash.example.com", testRedashAPIKey)
diff --git a/alert_test.go b/alert_test.go
index 5a85e29..34f8045 100644
--- a/alert_test.go
+++ b/alert_test.go
@@ -98,7 +98,7 @@ func Test_ListAlerts_IOErr(t *testing.T) {
 	defer httpmock.DeactivateAndReset()
 
 	httpmock.RegisterResponder(http.MethodGet, "https://redash.example.com/api/alerts", func(req *http.Request) (*http.Response, error) {
-		return ioErrResp, nil
+		return testIOErrResp, nil
 	})
 
 	client, _ := redash.NewClient("https://redash.example.com", testRedashAPIKey)
@@ -189,7 +189,7 @@ func Test_GetAlert_IOErr(t *testing.T) {
 	defer httpmock.DeactivateAndReset()
 
 	httpmock.RegisterResponder(http.MethodGet, "https://redash.example.com/api/alerts/1", func(req *http.Request) (*http.Response, error) {
-		return ioErrResp, nil
+		return testIOErrResp, nil
 	})
 
 	client, _ := redash.NewClient("https://redash.example.com", testRedashAPIKey)
@@ -305,7 +305,7 @@ func Test_CreateAlert_IOErr(t *testing.T) {
 	defer httpmock.DeactivateAndReset()
 
 	httpmock.RegisterResponder(http.MethodPost, "https://redash.example.com/api/alerts", func(req *http.Request) (*http.Response, error) {
-		return ioErrResp, nil
+		return testIOErrResp, nil
 	})
 
 	client, _ := redash.NewClient("https://redash.example.com", testRedashAPIKey)
@@ -432,7 +432,7 @@ func Test_UpdateAlert_IOErr(t *testing.T) {
 	defer httpmock.DeactivateAndReset()
 
 	httpmock.RegisterResponder(http.MethodPost, "https://redash.example.com/api/alerts/1", func(req *http.Request) (*http.Response, error) {
-		return ioErrResp, nil
+		return testIOErrResp, nil
 	})
 
 	client, _ := redash.NewClient("https://redash.example.com", testRedashAPIKey)
diff --git a/ping_test.go b/ping_test.go
index 1413cb2..2f5ff96 100644
--- a/ping_test.go
+++ b/ping_test.go
@@ -79,7 +79,7 @@ func Test_Ping_IOErr(t *testing.T) {
 	defer httpmock.DeactivateAndReset()
 
 	httpmock.RegisterResponder(http.MethodGet, "https://redash.example.com/ping", func(req *http.Request) (*http.Response, error) {
-		return ioErrResp, nil
+		return testIOErrResp, nil
 	})
 
 	client, _ := redash.NewClient("https://redash.example.com", testRedashAPIKey)
diff --git a/redash_go_test.go b/redash_go_test.go
index 813113b..cf8e1a6 100644
--- a/redash_go_test.go
+++ b/redash_go_test.go
@@ -11,8 +11,8 @@ import (
 )
 
 var (
-	testAcc   = false
-	ioErrResp = &http.Response{
+	testAcc       = false
+	testIOErrResp = &http.Response{
 		Status:     strconv.Itoa(http.StatusOK),
 		StatusCode: http.StatusOK,
 		Body:       io.NopCloser(iotest.ErrReader(errors.New("IO error"))),