Implement the debug flag in lint [#3]

internal/run/lint.go

@@ -1,7 +1,7 @@
 package run
 
 import (
-// "fmt"
+	"fmt"
 )
 
 // Lint is an execution step that calls `helm lint` when executed.
@@ -18,7 +18,13 @@ func (l *Lint) Execute(_ Config) error {
 
 // Prepare gets the Lint ready to execute.
 func (l *Lint) Prepare(cfg Config) error {
-	args := []string{"lint"}
+	args := make([]string, 0)
+
+	if cfg.Debug {
+		args = append(args, "--debug")
+	}
+
+	args = append(args, "lint")
 
 	if cfg.Values != "" {
 		args = append(args, "--set", cfg.Values)
@@ -36,5 +42,9 @@ func (l *Lint) Prepare(cfg Config) error {
 	l.cmd.Stdout(cfg.Stdout)
 	l.cmd.Stderr(cfg.Stderr)
 
+	if cfg.Debug {
+		fmt.Fprintf(cfg.Stderr, "Generated command: '%s'\n", l.cmd.String())
+	}
+
 	return nil
 }

internal/run/lint_test.go

@@ -1,8 +1,10 @@
 package run
 
 import (
+	"fmt"
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/suite"
+	"strings"
 	"testing"
 )
 
@@ -88,3 +90,35 @@ func (suite *LintTestSuite) TestPrepareWithLintFlags() {
 	err := l.Prepare(cfg)
 	suite.Require().Nil(err)
 }
+
+func (suite *LintTestSuite) TestPrepareWithDebugFlag() {
+	defer suite.ctrl.Finish()
+
+	stderr := strings.Builder{}
+
+	cfg := Config{
+		Debug:  true,
+		Stderr: &stderr,
+	}
+
+	l := Lint{
+		Chart: "./scotland/top_40",
+	}
+
+	command = func(path string, args ...string) cmd {
+		suite.mockCmd.EXPECT().
+			String().
+			Return(fmt.Sprintf("%s %s", path, strings.Join(args, " ")))
+
+		return suite.mockCmd
+	}
+
+	suite.mockCmd.EXPECT().Stdout(gomock.Any())
+	suite.mockCmd.EXPECT().Stderr(gomock.Any())
+
+	err := l.Prepare(cfg)
+	suite.Require().Nil(err)
+
+	want := fmt.Sprintf("Generated command: '%s --debug lint ./scotland/top_40'\n", helmBin)
+	suite.Equal(want, stderr.String())
+}