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package utils
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"reflect"
"testing"
"github.com/stretchr/testify/require"
)
type mockReader struct {
n int
err error
}
func (r *mockReader) Read(p []byte) (int, error) {
return r.n, r.err
}
// Helper function for setting os.Stdin for mocking in tests.
func setStdin(new *os.File) (cleanup func()) {
old := stdin
stdin = new
return func() { stdin = old }
}
// Returns a temp file and a cleanup function to delete it.
func newFile(t *testing.T, data []byte) (file *os.File, cleanup func()) {
f, err := ioutil.TempFile("" /* dir */, "utils-read-test")
require.NoError(t, err)
// write to temp file and reset read cursor to beginning of file
_, err = f.Write(data)
require.NoError(t, err)
_, err = f.Seek(0, io.SeekStart)
require.NoError(t, err)
return f, func() { os.Remove(f.Name()) }
}
func TestFileExists(t *testing.T) {
content := []byte("my file content")
f, cleanup := newFile(t, content)
defer cleanup()
type args struct {
path string
}
tests := []struct {
name string
args args
want bool
}{
{"ok", args{f.Name()}, true},
{"nok", args{f.Name() + ".foo"}, false},
{"empty", args{""}, false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := FileExists(tt.args.path); got != tt.want {
t.Errorf("FileExists() = %v, want %v", got, tt.want)
}
})
}
}
func TestReadAll(t *testing.T) {
content := []byte("read all this")
type args struct {
r io.Reader
}
tests := []struct {
name string
args args
want []byte
wantErr bool
}{
{"ok", args{bytes.NewReader(content)}, content, false},
{"fail", args{&mockReader{err: fmt.Errorf("this is an error")}}, []byte{}, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := ReadAll(tt.args.r)
if (err != nil) != tt.wantErr {
t.Errorf("ReadAll() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("ReadAll() = %v, want %v", got, tt.want)
}
})
}
}
func TestReadString(t *testing.T) {
c1 := []byte("read all this")
c2 := []byte("read all this\n and all that")
type args struct {
r io.Reader
}
tests := []struct {
name string
args args
want string
wantErr bool
}{
{"ok", args{bytes.NewReader(c1)}, "read all this", false},
{"ok with new line", args{bytes.NewReader(c2)}, "read all this", false},
{"fail", args{&mockReader{err: fmt.Errorf("this is an error")}}, "", true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := ReadString(tt.args.r)
if (err != nil) != tt.wantErr {
t.Errorf("ReadString() error = %v, wantErr %v", err, tt.wantErr)
return
}
if got != tt.want {
t.Errorf("ReadString() = %v, want %v", got, tt.want)
}
})
}
}
func TestReadFile(t *testing.T) {
content := []byte("my file content")
f, cleanup := newFile(t, content)
defer cleanup()
b, err := ReadFile(f.Name())
require.NoError(t, err)
require.True(t, bytes.Equal(content, b), "expected %s to equal %s", b, content)
}
func TestReadFileStdin(t *testing.T) {
content := []byte("my file content")
mockStdin, cleanup := newFile(t, content)
defer cleanup()
defer setStdin(mockStdin)()
b, err := ReadFile(stdinFilename)
require.NoError(t, err)
require.True(t, bytes.Equal(content, b), "expected %s to equal %s", b, content)
}
func TestReadPasswordFromFile(t *testing.T) {
content := []byte("my-password-on-file\n")
f, cleanup := newFile(t, content)
defer cleanup()
b, err := ReadPasswordFromFile(f.Name())
require.NoError(t, err)
require.True(t, bytes.Equal([]byte("my-password-on-file"), b), "expected %s to equal %s", b, content)
}
func TestStringReadPasswordFromFile(t *testing.T) {
content := []byte("my-password-on-file\n")
f, cleanup := newFile(t, content)
defer cleanup()
s, err := ReadStringPasswordFromFile(f.Name())
require.NoError(t, err)
require.Equal(t, "my-password-on-file", s, "expected %s to equal %s", s, content)
}
func TestReadInput(t *testing.T) {
type args struct {
prompt string
}
tests := []struct {
name string
args args
before func() func()
want []byte
wantErr bool
}{
{"ok", args{"Write input"}, func() func() {
content := []byte("my file content")
mockStdin, cleanup := newFile(t, content)
reset := setStdin(mockStdin)
return func() {
defer cleanup()
reset()
}
}, []byte("my file content"), false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
cleanup := tt.before()
defer cleanup()
got, err := ReadInput(tt.args.prompt)
if (err != nil) != tt.wantErr {
t.Errorf("ReadInput() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("ReadInput() = %v, want %v", got, tt.want)
}
})
}
}
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