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// Copyright (c) 2016 Kelsey Hightower and others. All rights reserved.
// Use of this source code is governed by the MIT License that can be found in
// the LICENSE file.
package envconfig
import (
"bytes"
"io"
"io/ioutil"
"log"
"os"
"strings"
"testing"
"text/tabwriter"
)
var testUsageTableResult, testUsageListResult, testUsageCustomResult, testUsageBadFormatResult string
func TestMain(m *testing.M) {
// Load the expected test results from a text file
data, err := ioutil.ReadFile("testdata/default_table.txt")
if err != nil {
log.Fatal(err)
}
testUsageTableResult = string(data)
data, err = ioutil.ReadFile("testdata/default_list.txt")
if err != nil {
log.Fatal(err)
}
testUsageListResult = string(data)
data, err = ioutil.ReadFile("testdata/custom.txt")
if err != nil {
log.Fatal(err)
}
testUsageCustomResult = string(data)
data, err = ioutil.ReadFile("testdata/fault.txt")
if err != nil {
log.Fatal(err)
}
testUsageBadFormatResult = string(data)
retCode := m.Run()
os.Exit(retCode)
}
func compareUsage(want, got string, t *testing.T) {
got = strings.Replace(got, " ", ".", -1)
if want != got {
shortest := len(want)
if len(got) < shortest {
shortest = len(got)
}
if len(want) != len(got) {
t.Errorf("expected result length of %d, found %d", len(want), len(got))
}
for i := 0; i < shortest; i++ {
if want[i] != got[i] {
t.Errorf("difference at index %d, expected '%c' (%v), found '%c' (%v)\n",
i, want[i], want[i], got[i], got[i])
break
}
}
t.Errorf("Complete Expected:\n'%s'\nComplete Found:\n'%s'\n", want, got)
}
}
func TestUsageDefault(t *testing.T) {
var s Specification
os.Clearenv()
save := os.Stdout
r, w, _ := os.Pipe()
os.Stdout = w
err := Usage("env_config", &s)
outC := make(chan string)
// copy the output in a separate goroutine so printing can't block indefinitely
go func() {
var buf bytes.Buffer
io.Copy(&buf, r)
outC <- buf.String()
}()
w.Close()
os.Stdout = save // restoring the real stdout
out := <-outC
if err != nil {
t.Error(err.Error())
}
compareUsage(testUsageTableResult, out, t)
}
func TestUsageTable(t *testing.T) {
var s Specification
os.Clearenv()
buf := new(bytes.Buffer)
tabs := tabwriter.NewWriter(buf, 1, 0, 4, ' ', 0)
err := Usagef("env_config", &s, tabs, DefaultTableFormat)
tabs.Flush()
if err != nil {
t.Error(err.Error())
}
compareUsage(testUsageTableResult, buf.String(), t)
}
func TestUsageList(t *testing.T) {
var s Specification
os.Clearenv()
buf := new(bytes.Buffer)
err := Usagef("env_config", &s, buf, DefaultListFormat)
if err != nil {
t.Error(err.Error())
}
compareUsage(testUsageListResult, buf.String(), t)
}
func TestUsageCustomFormat(t *testing.T) {
var s Specification
os.Clearenv()
buf := new(bytes.Buffer)
err := Usagef("env_config", &s, buf, "{{range .}}{{usage_key .}}={{usage_description .}}\n{{end}}")
if err != nil {
t.Error(err.Error())
}
compareUsage(testUsageCustomResult, buf.String(), t)
}
func TestUsageUnknownKeyFormat(t *testing.T) {
var s Specification
unknownError := "template: envconfig:1:2: executing \"envconfig\" at <.UnknownKey>"
os.Clearenv()
buf := new(bytes.Buffer)
err := Usagef("env_config", &s, buf, "{{.UnknownKey}}")
if err == nil {
t.Errorf("expected 'unknown key' error, but got no error")
}
if strings.Index(err.Error(), unknownError) == -1 {
t.Errorf("expected '%s', but got '%s'", unknownError, err.Error())
}
}
func TestUsageBadFormat(t *testing.T) {
var s Specification
os.Clearenv()
// If you don't use two {{}} then you get a lieteral
buf := new(bytes.Buffer)
err := Usagef("env_config", &s, buf, "{{range .}}{.Key}\n{{end}}")
if err != nil {
t.Error(err.Error())
}
compareUsage(testUsageBadFormatResult, buf.String(), t)
}
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