fix tests and lint

cmd/bundle/init.go

@@ -36,6 +36,7 @@ See https://docs.databricks.com/en/dev-tools/bundles/templates.html for more inf
 	cmd.Flags().StringVar(&branch, "tag", "", "Git tag to use for template initialization")
 	cmd.Flags().StringVar(&tag, "branch", "", "Git branch to use for template initialization")
 
+	cmd.PreRunE = root.MustWorkspaceClient
 	cmd.RunE = func(cmd *cobra.Command, args []string) error {
 		r := template.Resolver{
 			TemplatePathOrUrl: args[0],

libs/template/reader_test.go

@@ -32,10 +32,10 @@ func TestBuiltInReader(t *testing.T) {
 		// message defined.
 		fd, err := fs.Open("databricks_template_schema.json")
 		require.NoError(t, err)
-		defer fd.Close()
 		b, err := io.ReadAll(fd)
 		require.NoError(t, err)
 		assert.Contains(t, string(b), "welcome_message")
+		assert.NoError(t, fd.Close())
 	}
 
 	r := &builtinReader{name: "doesnotexist"}
@@ -78,10 +78,10 @@ func TestGitUrlReader(t *testing.T) {
 	// Assert the fs returned is rooted at the templateDir.
 	fd, err := fs.Open("somefile")
 	require.NoError(t, err)
-	defer fd.Close()
 	b, err := io.ReadAll(fd)
 	require.NoError(t, err)
 	assert.Equal(t, "somecontent", string(b))
+	assert.NoError(t, fd.Close())
 
 	// Assert the FS is cached. cloneFunc should not be called again.
 	_, err = r.FS(ctx)
@@ -106,10 +106,10 @@ func TestLocalReader(t *testing.T) {
 	// Assert the fs returned is rooted at correct location.
 	fd, err := fs.Open("somefile")
 	require.NoError(t, err)
-	defer fd.Close()
 	b, err := io.ReadAll(fd)
 	require.NoError(t, err)
 	assert.Equal(t, "somecontent", string(b))
+	assert.NoError(t, fd.Close())
 
 	// Assert close does not error
 	assert.NoError(t, r.Close())

libs/template/resolve.go

@@ -8,10 +8,22 @@ import (
 )
 
 type Resolver struct {
+	// One of the following three:
+	// 1. Path to a local template directory.
+	// 2. URL to a Git repository containing a template.
+	// 3. Name of a built-in template.
 	TemplatePathOrUrl string
+
+	// Path to a JSON file containing the configuration values to be used for
+	// template initialization.
 	ConfigFile string
+
+	// Directory to write the initialized template to.
 	OutputDir string
+
+	// Directory path within a Git repository containing the template.
 	TemplateDir string
+
 	Tag    string
 	Branch string
 }
@@ -32,23 +44,32 @@ func (r Resolver) Resolve(ctx context.Context) (*Template, error) {
 		ref = r.Tag
 	}
 
-	var tmpl *Template
+	var err error
+	var templateName TemplateName
+
 	if r.TemplatePathOrUrl == "" {
 		// Prompt the user to select a template
 		// if a template path or URL is not provided.
-		tmplId, err := SelectTemplate(ctx)
+		templateName, err = SelectTemplate(ctx)
 		if err != nil {
 			return nil, err
 		}
+	}
 
-		if tmplId == Custom {
+	templateName = TemplateName(r.TemplatePathOrUrl)
+
+	// User should not directly select "custom" and instead should provide the
+	// file path or the Git URL for the template directly.
+	// Custom is just for internal representation purposes.
+	if templateName == Custom {
 		return nil, ErrCustomSelected
 	}
 
-		tmpl = Get(tmplId)
-	} else {
-		// Based on the provided template path or URL,
-		// configure a reader for the template.
+	tmpl := Get(templateName)
+
+	// If the user directory provided a template path or URL that is not a built-in template,
+	// then configure a reader for the template.
+	if tmpl == nil {
 		tmpl = Get(Custom)
 		if isRepoUrl(r.TemplatePathOrUrl) {
 			tmpl.Reader = &gitReader{
@@ -62,9 +83,10 @@ func (r Resolver) Resolve(ctx context.Context) (*Template, error) {
 				path: r.TemplatePathOrUrl,
 			}
 		}
+
 	}
 
-	err := tmpl.Writer.Configure(ctx, r.ConfigFile, r.OutputDir)
+	err = tmpl.Writer.Configure(ctx, r.ConfigFile, r.OutputDir)
 	if err != nil {
 		return nil, err
 	}

libs/template/template.go

@@ -96,7 +96,6 @@ func options() []cmdio.Tuple {
 	return names
 }
 
-// TODO CONTINUE defining the methods that the init command will finally rely on.
 func SelectTemplate(ctx context.Context) (TemplateName, error) {
 	if !cmdio.IsPromptSupported(ctx) {
 		return "", fmt.Errorf("please specify a template")

libs/template/writer.go

@@ -14,28 +14,7 @@ import (
 	"github.com/databricks/cli/libs/filer"
 )
 
-// TODO: Retain coverage for the missing schema test case
-// func TestMaterializeForNonTemplateDirectory(t *testing.T) {
-// 	tmpDir := t.TempDir()
-// 	w, err := databricks.NewWorkspaceClient(&databricks.Config{})
-// 	require.NoError(t, err)
-// 	ctx := root.SetWorkspaceClient(context.Background(), w)
-
-// 	tmpl := TemplateX{
-// 		TemplateOpts: TemplateOpts{
-// 			ConfigFilePath: "",
-// 			TemplateFS:     os.DirFS(tmpDir),
-// 			OutputFiler:    nil,
-// 		},
-// 	}
-
-// 	// Try to materialize a non-template directory.
-// 	err = tmpl.Materialize(ctx)
-// 	assert.EqualError(t, err, fmt.Sprintf("not a bundle template: expected to find a template schema file at %s", schemaFileName))
-// }
-
-// TODO: Add tests for these writers, mocking the cmdio library
-// at the same time.
+// TODO: Add some golden tests for these.
 const (
 	libraryDirName  = "library"
 	templateDirName = "template"
@@ -77,7 +56,7 @@ func constructOutputFiler(ctx context.Context, outputDir string) (filer.Filer, e
 	return filer.NewLocalClient(outputDir)
 }
 
-func (tmpl *defaultWriter) Configure(ctx context.Context, configPath string, outputDir string) error {
+func (tmpl *defaultWriter) Configure(ctx context.Context, configPath, outputDir string) error {
 	tmpl.configPath = configPath
 
 	outputFiler, err := constructOutputFiler(ctx, outputDir)

libs/template/writer_test.go

@@ -0,0 +1,50 @@
+package template
+
+import (
+	"context"
+	"testing"
+
+	"github.com/databricks/cli/cmd/root"
+	"github.com/databricks/cli/libs/dbr"
+	"github.com/databricks/cli/libs/filer"
+	"github.com/databricks/databricks-sdk-go"
+	workspaceConfig "github.com/databricks/databricks-sdk-go/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDefaultWriterConfigure(t *testing.T) {
+	// Test on local file system.
+	w1 := &defaultWriter{}
+	err := w1.Configure(context.Background(), "/foo/bar", "/out/abc")
+	assert.NoError(t, err)
+
+	assert.Equal(t, "/foo/bar", w1.configPath)
+	assert.IsType(t, &filer.LocalClient{}, w1.outputFiler)
+
+	// Test on DBR
+	ctx := dbr.MockRuntime(context.Background(), true)
+	ctx = root.SetWorkspaceClient(ctx, &databricks.WorkspaceClient{
+		Config: &workspaceConfig.Config{Host: "https://myhost.com"},
+	})
+	w2 := &defaultWriter{}
+	err = w2.Configure(ctx, "/foo/bar", "/Workspace/out/abc")
+	assert.NoError(t, err)
+
+	assert.Equal(t, "/foo/bar", w2.configPath)
+	assert.IsType(t, &filer.WorkspaceFilesClient{}, w2.outputFiler)
+}
+
+func TestMaterializeForNonTemplateDirectory(t *testing.T) {
+	tmpDir1 := t.TempDir()
+	tmpDir2 := t.TempDir()
+	ctx := context.Background()
+
+	w := &defaultWriter{}
+	err := w.Configure(ctx, "/foo/bar", tmpDir1)
+	require.NoError(t, err)
+
+	// Try to materialize a non-template directory.
+	err = w.Materialize(ctx, &localReader{path: tmpDir2})
+	assert.EqualError(t, err, "not a bundle template: expected to find a template schema file at databricks_template_schema.json")
+}