fix: use Reader interface as the input of LoadValues and enhance UT of LoadValues

Signed-off-by: lubingtan <bingtanlu@gmail.com>

pkg/chart/loader/load.go

@@ -107,7 +107,7 @@ func LoadFiles(files []*BufferedFile) (*chart.Chart, error) {
 				return c, errors.Wrap(err, "cannot load Chart.lock")
 			}
 		case f.Name == "values.yaml":
-			values, err := LoadValues(f.Data)
+			values, err := LoadValues(bytes.NewReader(f.Data))
 			if err != nil {
 				return c, errors.Wrap(err, "cannot load values.yaml")
 			}
@@ -207,9 +207,10 @@ func LoadFiles(files []*BufferedFile) (*chart.Chart, error) {
 	return c, nil
 }
 
-func LoadValues(data []byte) (map[string]interface{}, error) {
+// LoadValues loads chat values from a reader.
+func LoadValues(data io.Reader) (map[string]interface{}, error) {
 	values := map[string]interface{}{}
-	reader := utilyaml.NewYAMLReader(bufio.NewReader(bytes.NewReader(data)))
+	reader := utilyaml.NewYAMLReader(bufio.NewReader(data))
 	for {
 		currentMap := map[string]interface{}{}
 		raw, err := reader.Read()

pkg/chart/loader/load_test.go

@@ -490,13 +490,11 @@ func TestLoadInvalidArchive(t *testing.T) {
 }
 
 func TestLoadValues(t *testing.T) {
-	testDatas := []struct {
-		name          string
+	testCases := map[string]struct {
 		data          []byte
 		expctedValues map[string]interface{}
 	}{
-		{
-			name: "It should load values correctly",
+		"It should load values correctly": {
 			data: []byte(`
 foo:
   image: foo:v1
@@ -512,8 +510,7 @@ bar:
 				},
 			},
 		},
-		{
-			name: "It should load values correctly with multiple documents in one file",
+		"It should load values correctly with multiple documents in one file": {
 			data: []byte(`
 foo:
   image: foo:v1
@@ -533,14 +530,14 @@ foo:
 			},
 		},
 	}
-	for _, testData := range testDatas {
-		t.Run(testData.name, func(tt *testing.T) {
-			values, err := LoadValues(testData.data)
+	for testName, testCase := range testCases {
+		t.Run(testName, func(tt *testing.T) {
+			values, err := LoadValues(bytes.NewReader(testCase.data))
 			if err != nil {
 				tt.Fatal(err)
 			}
-			if !reflect.DeepEqual(values, testData.expctedValues) {
-				tt.Errorf("Expected values: %v, got %v", testData.expctedValues, values)
+			if !reflect.DeepEqual(values, testCase.expctedValues) {
+				tt.Errorf("Expected values: %v, got %v", testCase.expctedValues, values)
 			}
 		})
 	}

pkg/cli/values/options.go

@@ -17,6 +17,7 @@ limitations under the License.
 package values
 
 import (
+	"bytes"
 	"encoding/json"
 	"io"
 	"net/url"
@@ -47,11 +48,11 @@ func (opts *Options) MergeValues(p getter.Providers) (map[string]interface{}, er
 
 	// User specified a values files via -f/--values
 	for _, filePath := range opts.ValueFiles {
-		bytes, err := readFile(filePath, p)
+		raw, err := readFile(filePath, p)
 		if err != nil {
 			return nil, err
 		}
-		currentMap, err := loader.LoadValues(bytes)
+		currentMap, err := loader.LoadValues(bytes.NewReader(raw))
 		if err != nil {
 			return nil, errors.Wrapf(err, "failed to parse %s", filePath)
 		}