add helper tests (#472)

Signed-off-by: yxxhero <aiopsclub@163.com>

cmd/helpers_test.go

@@ -0,0 +1,142 @@
+package cmd
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"os/exec"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func captureStdout(f func()) (string, error) {
+	old := os.Stdout
+	r, w, err := os.Pipe()
+	if err != nil {
+		return "", err
+	}
+	os.Stdout = w
+
+	defer func() {
+		os.Stdout = old
+	}()
+
+	f()
+
+	w.Close()
+
+	var buf bytes.Buffer
+	_, err = io.Copy(&buf, r)
+	if err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
+
+func TestCaptureStdout(t *testing.T) {
+	output, err := captureStdout(func() {
+		_, _ = os.Stdout.Write([]byte("test"))
+	})
+	require.NoError(t, err)
+	require.Equal(t, "test", output)
+}
+
+func TestIsDebug(t *testing.T) {
+	tests := []struct {
+		name     string
+		envValue string
+		expected bool
+	}{
+		{
+			name:     "HELM_DEBUG is true",
+			envValue: "true",
+			expected: true,
+		},
+		{
+			name:     "HELM_DEBUG is false",
+			envValue: "false",
+			expected: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv("HELM_DEBUG", tt.envValue)
+			require.Equalf(t, tt.expected, isDebug(), "Expected %v but got %v", tt.expected, isDebug())
+		})
+	}
+}
+
+func TestDebugPrint(t *testing.T) {
+	tests := []struct {
+		name     string
+		envValue string
+		expected string
+	}{
+		{
+			name:     "non-empty when HELM_DEBUG is true",
+			envValue: "true",
+			expected: "test\n",
+		},
+		{
+			name:     "empty when HELM_DEBUG is false",
+			envValue: "false",
+			expected: "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv("HELM_DEBUG", tt.envValue)
+			output, err := captureStdout(func() {
+				debugPrint("test")
+			})
+			require.NoError(t, err)
+			require.Equalf(t, tt.expected, output, "Expected %v but got %v", tt.expected, output)
+		})
+	}
+}
+
+func TestOutputWithRichError(t *testing.T) {
+	tests := []struct {
+		name           string
+		envValue       string
+		cmd            *exec.Cmd
+		expected       string
+		expectedStdout string
+	}{
+		{
+			name:           "debug output in stdout when HELM_DEBUG is true",
+			envValue:       "true",
+			cmd:            exec.Command("echo", "test1"),
+			expected:       "test1\n",
+			expectedStdout: "Executing echo test1\n",
+		},
+		{
+			name:           "non-debug output in stdout when HELM_DEBUG is false",
+			envValue:       "false",
+			cmd:            exec.Command("echo", "test2"),
+			expected:       "test2\n",
+			expectedStdout: "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv("HELM_DEBUG", tt.envValue)
+			var (
+				stdoutString        string
+				outBytes            []byte
+				funcErr, captureErr error
+			)
+			stdoutString, captureErr = captureStdout(func() {
+				outBytes, funcErr = outputWithRichError(tt.cmd)
+			})
+			require.NoError(t, captureErr)
+			require.NoError(t, funcErr)
+			require.Equalf(t, tt.expected, string(outBytes), "Expected %v but got %v", tt.expected, string(outBytes))
+			require.Equalf(t, tt.expectedStdout, stdoutString, "Expected %v but got %v", tt.expectedStdout, stdoutString)
+		})
+	}
+}