diff --git a/output/csv/config_test.go b/output/csv/config_test.go
index c05f51c13e8..7f76e39c3d3 100644
--- a/output/csv/config_test.go
+++ b/output/csv/config_test.go
@@ -13,6 +13,8 @@ import (
 )
 
 func TestNewConfig(t *testing.T) {
+	t.Parallel()
+
 	config := NewConfig()
 	assert.Equal(t, "file.csv", config.FileName.String)
 	assert.Equal(t, "1s", config.SaveInterval.String())
@@ -20,6 +22,8 @@ func TestNewConfig(t *testing.T) {
 }
 
 func TestApply(t *testing.T) {
+	t.Parallel()
+
 	configs := []Config{
 		{
 			FileName:     null.StringFrom(""),
@@ -52,7 +56,10 @@ func TestApply(t *testing.T) {
 	for i := range configs {
 		config := configs[i]
 		expected := expected[i]
+
 		t.Run(expected.FileName+"_"+expected.SaveInterval, func(t *testing.T) {
+			t.Parallel()
+
 			baseConfig := NewConfig()
 			baseConfig = baseConfig.Apply(config)
 
@@ -64,6 +71,8 @@ func TestApply(t *testing.T) {
 }
 
 func TestParseArg(t *testing.T) {
+	t.Parallel()
+
 	cases := map[string]struct {
 		config             Config
 		expectedLogEntries []string
@@ -100,6 +109,8 @@ func TestParseArg(t *testing.T) {
 		testCase := testCase
 
 		t.Run(arg, func(t *testing.T) {
+			t.Parallel()
+
 			config, err := ParseArg(arg)
 
 			if testCase.expectedErr {
diff --git a/output/csv/output_test.go b/output/csv/output_test.go
index 8e85d3b9592..ff7f4fffdff 100644
--- a/output/csv/output_test.go
+++ b/output/csv/output_test.go
@@ -22,6 +22,8 @@ import (
 )
 
 func TestMakeHeader(t *testing.T) {
+	t.Parallel()
+
 	testdata := map[string][]string{
 		"One tag": {
 			"tag1",
@@ -33,7 +35,10 @@ func TestMakeHeader(t *testing.T) {
 
 	for testname, tags := range testdata {
 		testname, tags := testname, tags
+
 		t.Run(testname, func(t *testing.T) {
+			t.Parallel()
+
 			header := MakeHeader(tags)
 			assert.Equal(t, len(tags)+5, len(header))
 			assert.Equal(t, "metric_name", header[0])
@@ -46,6 +51,8 @@ func TestMakeHeader(t *testing.T) {
 }
 
 func TestSampleToRow(t *testing.T) {
+	t.Parallel()
+
 	registry := metrics.NewRegistry()
 	testMetric, err := registry.NewMetric("my_metric", metrics.Gauge)
 	require.NoError(t, err)
@@ -306,6 +313,8 @@ func TestSampleToRow(t *testing.T) {
 		expectedRow := expected[i]
 
 		t.Run(testname, func(t *testing.T) {
+			t.Parallel()
+
 			row := SampleToRow(sample, resTags, ignoredTags, make([]string, 3+len(resTags)+2), timeFormat)
 			for ind, cell := range expectedRow.baseRow {
 				assert.Equal(t, cell, row[ind])
@@ -323,7 +332,7 @@ func readUnCompressedFile(fileName string, fs fsext.Fs) string {
 		return err.Error()
 	}
 
-	return fmt.Sprintf("%s", csvbytes)
+	return string(csvbytes)
 }
 
 func readCompressedFile(fileName string, fs fsext.Fs) string {
@@ -342,7 +351,7 @@ func readCompressedFile(fileName string, fs fsext.Fs) string {
 		return err.Error()
 	}
 
-	return fmt.Sprintf("%s", csvbytes)
+	return string(csvbytes)
 }
 
 func TestRun(t *testing.T) {