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// Copyright (c) 2020, Mohlmann Solutions SRL. All rights reserved.
// Use of this source code is governed by a License that can be found in the LICENSE file.
// SPDX-License-Identifier: BSD-3-Clause
package ehtml
import (
"bytes"
"errors"
"fmt"
"html/template"
"io"
"io/ioutil"
"log"
"net/http"
"net/http/httptest"
"reflect"
"testing"
"github.com/gorilla/mux"
)
func TestStatus_String(t *testing.T) {
tests := []struct {
name string
status Status
want string
}{
{
"Unknown",
900,
"",
},
{
"Known",
http.StatusTeapot,
"I'm a teapot",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.status.String(); got != tt.want {
t.Errorf("Data.StatusText() = %v, want %v", got, tt.want)
}
})
}
}
func TestStatus_int(t *testing.T) {
tests := []struct {
name string
s Status
want int
}{
{
"Int",
400,
400,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.s.Int(); got != tt.want {
t.Errorf("Status.int() = %v, want %v", got, tt.want)
}
})
}
}
func TestStatus_toA(t *testing.T) {
tests := []struct {
name string
s Status
want string
}{
{
"String",
400,
"400",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.s.toA(); got != tt.want {
t.Errorf("Status.toA() = %v, want %v", got, tt.want)
}
})
}
}
func TestData_Request(t *testing.T) {
d := &Data{Req: httptest.NewRequest("GET", "http://example.com/foo", nil)}
if got := d.Request(); !reflect.DeepEqual(got, d.Req) {
t.Errorf("Data.Request() = %v, want %v", got, d.Req)
}
}
func TestData_Status(t *testing.T) {
d := &Data{Code: http.StatusTeapot}
if got := d.Status(); got != http.StatusTeapot {
t.Errorf("Data.Status() = %v, want %v", got, http.StatusTeapot)
}
}
func TestData_Message(t *testing.T) {
d := &Data{Msg: "FooBar"}
if got := d.Message(); got != "FooBar" {
t.Errorf("Data.Message() = %v, want %v", got, "FooBar")
}
}
func TestData_String(t *testing.T) {
type fields struct {
Code Status
Msg string
}
tests := []struct {
name string
fields fields
want string
}{
{
"Code not set",
fields{
Msg: "Something's missing",
},
"0 : Something's missing",
},
{
"Known",
fields{
Code: http.StatusBadRequest,
Msg: "Parsing form data",
},
"400 Bad Request: Parsing form data",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
d := &Data{
Code: tt.fields.Code,
Msg: tt.fields.Msg,
}
if got := d.String(); got != tt.want {
t.Errorf("Data.String() = %v, want %v", got, tt.want)
}
})
}
}
const defaultTmplOut = `<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>404 Not Found: Foo bar</title>
</head>
<body>
<h1>404 Not Found</h1>
<p>Foo bar</p>
</body>
</html>`
const (
testErrTemplate = `{{ define "error" }}Generic template{{ end }}`
test404Template = `{{ define "404" }}404 template{{ end }}`
testWrongTemplate = `{{ define "wrong" }}Wrong template{{ end }}`
)
var testTmpl, wrongTmpl *template.Template
func init() {
testTmpl = template.Must(template.New("error").Parse(testErrTemplate))
testTmpl = template.Must(testTmpl.Parse(test404Template))
wrongTmpl = template.Must(template.New("wrong").Parse(testWrongTemplate))
}
func TestPages_template(t *testing.T) {
d := &Data{
Code: 404,
Msg: "Foo bar",
}
tests := []struct {
name string
tmpl *template.Template
status Status
want string
}{
{
"Nil, default",
nil,
404,
defaultTmplOut,
},
{
"Code defined",
testTmpl,
404,
"404 template",
},
{
"Unknown code, generic",
testTmpl,
400,
"Generic template",
},
{
"Wrong, default",
wrongTmpl,
404,
defaultTmplOut,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
p := &Pages{
Tmpl: tt.tmpl,
}
var buf bytes.Buffer
if err := p.template(tt.status).Execute(&buf, d); err != nil {
t.Fatal(err)
}
if got := buf.String(); got != tt.want {
t.Errorf("Pages.template() = \n%v\nwant\n%v", got, tt.want)
}
})
}
}
func TestPages_Render(t *testing.T) {
errTmpl := template.Must(template.New("error").Parse("{{ .Missing }}"))
tests := []struct {
name string
tmpl *template.Template
code Status
want string
wantCode int
wantErr bool
}{
{
"Default template",
nil,
http.StatusNotFound,
defaultTmplOut,
http.StatusNotFound,
false,
},
{
"Execution error",
errTmpl,
http.StatusNotFound,
"500 Internal server error. While handling:\n404 Not Found: Foo bar",
http.StatusInternalServerError,
true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
p := &Pages{
Tmpl: tt.tmpl,
}
d := &Data{
Req: httptest.NewRequest("GET", "http://example.com/foo", nil),
Code: tt.code,
Msg: "Foo bar",
}
w := httptest.NewRecorder()
if err := p.Render(w, d); (err != nil) != tt.wantErr {
t.Fatalf("Pages.Render() error = %v, wantErr %v", err, tt.wantErr)
}
resp := w.Result()
body, _ := ioutil.ReadAll(resp.Body)
if resp.StatusCode != tt.wantCode {
t.Errorf("Pages.Render() status = %v, want: %v", resp.StatusCode, tt.wantCode)
}
got := string(body)
if got != tt.want {
t.Errorf("Pages.Render() = \n%v\nwant\n%v", got, tt.want)
}
})
}
}
type errorWriter struct{}
func (errorWriter) Header() http.Header { return nil }
func (errorWriter) Write([]byte) (int, error) { return 0, io.ErrClosedPipe }
func (errorWriter) WriteHeader(int) {}
func TestPages_Render_WriteError(t *testing.T) {
p := &Pages{}
d := &Data{
Req: httptest.NewRequest("GET", "http://example.com/foo", nil),
Code: http.StatusTeapot,
Msg: "Foo bar",
}
if err := p.Render(errorWriter{}, d); !errors.Is(err, io.ErrClosedPipe) {
t.Errorf("Pages.Render() error = %v, wantErr %v", err, io.ErrClosedPipe)
}
}
const exampleTemplates = `
{{- define "head" -}}
<head>
<meta charset="utf-8">
<title>{{ .String }}</title>
</head>
{{- end -}}
{{- define "error" -}}
<!DOCTYPE html>
<html lang="en">
{{ template "head" . }}
<body>
<h1>{{ .Status.Int }} {{ .Status }}</h1>
<p>
{{ .Message }} while serving {{ .Request.URL.Path }}.
Request ID: {{ .ReqID }}
</p>
<p><i>This is a generic error page</i><p>
</body>
</html>
{{- end -}}
{{- define "500" -}}
<!DOCTYPE html>
<html lang="en">
{{ template "head" . }}
<body>
<h1>Snap!</h1>
<h2>{{ .Status.Int }} {{ .Status }}</h2>
<p>
Something went really wrong and we've been notified!
Please try again later.
</p>
<p><i>
Error: {{ .Message }} while serving {{ .Request.URL.Path }}.
Request ID: {{ .ReqID }}
</i></p>
</body>
</html>
{{- end -}}
{{- define "404" -}}
<!DOCTYPE html>
<html lang="en">
<head>
{{ template "head" . }}
</head>
<body>
<h1>{{ .Status.Int}} {{ .Status }}</h1>
<p>
{{ .Request.URL.Path }} could not be found.
</p>
</body>
</html>
{{- end -}}`
func Example() {
p := &Pages{template.Must(template.New("error").Parse(exampleTemplates))}
req := httptest.NewRequest("GET", "http://example.com/foo", nil)
w := httptest.NewRecorder()
// Extend Data, as needed
type data struct {
Data
ReqID int
}
// Serves the client with the "500" template
err := p.Render(w, &data{Data{req, http.StatusInternalServerError, "DB connection"}, 666})
if err != nil {
log.Println(err)
}
resp := w.Result()
body, _ := ioutil.ReadAll(resp.Body)
fmt.Println(resp.StatusCode)
fmt.Println(string(body))
w = httptest.NewRecorder()
// 400 is not defined, so the generic "error" template is used instead.
err = p.Render(w, &data{Data{req, http.StatusBadRequest, "Missing token in URL"}, 667})
if err != nil {
log.Println(err)
}
resp = w.Result()
body, _ = ioutil.ReadAll(resp.Body)
fmt.Println(resp.StatusCode)
fmt.Println(string(body))
}
func Example_notFoundHandler() {
p := &Pages{template.Must(template.New("error").Parse(exampleTemplates))}
rtr := mux.NewRouter()
rtr.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if err := p.Render(w, &Data{Req: r, Code: http.StatusNotFound}); err != nil {
log.Println(err)
}
})
}