Add test template example for helm create (#4524)

* Add test template example for helm create

As helm create ganerates an nginx chart, the example is based on
https://github.com/helm/helm/blob/master/docs/examples/nginx/templates/
service-test.yaml

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

* Update after review

- https://github.com/helm/helm/pull/4524#pullrequestreview-155183390
- https://github.com/helm/helm/pull/4524#pullrequestreview-155379922
- Fix where app.kubernetes.io/instance was incorrect in service selector

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

* Add doc update

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

* Update GO formatting

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

cmd/helm/create.go

@@ -47,6 +47,8 @@ something like this:
 	  |- charts/            # Charts that this chart depends on
 	  |
 	  |- templates/         # The template files
+	  |
+	  |- templates/tests/   # The test files
 
 'helm create' takes a path for an argument. If directories in the given path
 do not exist, Helm will attempt to create them as it goes. If the given
@@ -84,7 +86,6 @@ func newCreateCmd(out io.Writer) *cobra.Command {
 
 func (c *createCmd) run() error {
 	fmt.Fprintf(c.out, "Creating %s\n", c.name)
-
 	chartname := filepath.Base(c.name)
 	cfile := &chart.Metadata{
 		Name:        chartname,

cmd/helm/create_test.go

@@ -143,8 +143,8 @@ func TestCreateStarterCmd(t *testing.T) {
 		t.Errorf("Wrong API version: %q", c.Metadata.ApiVersion)
 	}
 
-	if l := len(c.Templates); l != 6 {
+	if l := len(c.Templates); l != 7 {
-		t.Errorf("Expected 5 templates, got %d", l)
+		t.Errorf("Expected 6 templates, got %d", l)
 	}
 
 	found := false

docs/helm/helm_create.md

@@ -22,6 +22,8 @@ something like this:
 	  |- charts/            # Charts that this chart depends on
 	  |
 	  |- templates/         # The template files
+	  |
+	  |- templates/tests/   # The test files
 
 'helm create' takes a path for an argument. If directories in the given path
 do not exist, Helm will attempt to create them as it goes. If the given
@@ -56,4 +58,4 @@ helm create NAME [flags]
 
 * [helm](helm.md)	 - The Helm package manager for Kubernetes.
 
-###### Auto generated by spf13/cobra on 1-Aug-2018
+###### Auto generated by spf13/cobra on 18-Sep-2018

pkg/chartutil/create.go

@@ -44,8 +44,12 @@ const (
 	ServiceName = "service.yaml"
 	// NotesName is the name of the example NOTES.txt file.
 	NotesName = "NOTES.txt"
-	// HelpersName is the name of the example NOTES.txt file.
+	// HelpersName is the name of the example helpers file.
 	HelpersName = "_helpers.tpl"
+	// TemplatesTestsDir is the relative directory name for templates tests.
+	TemplatesTestsDir = "templates/tests"
+	// TestConnectionName is the name of the example connection test file.
+	TestConnectionName = "test-connection.yaml"
 )
 
 const defaultValues = `# Default values for %s.
@@ -295,6 +299,26 @@ Create chart name and version as used by the chart label.
 {{- end -}}
 `
 
+const defaultTestConnection = `apiVersion: v1
+kind: Pod
+metadata:
+  name: "{{ include "<CHARTNAME>.fullname" . }}-test-connection"
+  labels:
+    app.kubernetes.io/name: {{ include "<CHARTNAME>.name" . }}
+    helm.sh/chart: {{ include "<CHARTNAME>.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+  annotations:
+    "helm.sh/hook": test-success
+spec:
+  containers:
+    - name: wget
+      image: busybox
+      command: ['wget']
+      args:  ['{{ include "<CHARTNAME>.fullname" . }}:{{ .Values.service.port }}']
+  restartPolicy: Never
+`
+
 // CreateFrom creates a new chart, but scaffolds it from the src chart.
 func CreateFrom(chartfile *chart.Metadata, dest string, src string) error {
 	schart, err := Load(src)
@@ -359,7 +383,7 @@ func Create(chartfile *chart.Metadata, dir string) (string, error) {
 		}
 	}
 
-	for _, d := range []string{TemplatesDir, ChartsDir} {
+	for _, d := range []string{TemplatesDir, TemplatesTestsDir, ChartsDir} {
 		if err := os.MkdirAll(filepath.Join(cdir, d), 0755); err != nil {
 			return cdir, err
 		}
@@ -404,6 +428,11 @@ func Create(chartfile *chart.Metadata, dir string) (string, error) {
 			path:    filepath.Join(cdir, TemplatesDir, HelpersName),
 			content: Transform(defaultHelpers, "<CHARTNAME>", chartfile.Name),
 		},
+		{
+			// test-connection.yaml
+			path:    filepath.Join(cdir, TemplatesTestsDir, TestConnectionName),
+			content: Transform(defaultTestConnection, "<CHARTNAME>", chartfile.Name),
+		},
 	}
 
 	for _, file := range files {

pkg/chartutil/create_test.go

@@ -75,6 +75,14 @@ func TestCreate(t *testing.T) {
 		}
 	}
 
+	for _, f := range []string{TestConnectionName} {
+		if fi, err := os.Stat(filepath.Join(dir, TemplatesTestsDir, f)); err != nil {
+			t.Errorf("Expected %s file: %s", f, err)
+		} else if fi.IsDir() {
+			t.Errorf("Expected %s to be a file.", f)
+		}
+	}
+
 }
 
 func TestCreateFrom(t *testing.T) {

pkg/chartutil/save.go

@@ -54,7 +54,7 @@ func SaveDir(c *chart.Chart, dest string) error {
 		}
 	}
 
-	for _, d := range []string{TemplatesDir, ChartsDir} {
+	for _, d := range []string{TemplatesDir, ChartsDir, TemplatesTestsDir} {
 		if err := os.MkdirAll(filepath.Join(outdir, d), 0755); err != nil {
 			return err
 		}