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package input
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"testing"
)
func TestSelect(t *testing.T) {
cases := []struct {
list []string
opts *Options
userInput io.Reader
expect string
}{
{
list: []string{"A", "B", "C"},
opts: &Options{},
userInput: bytes.NewBufferString("1\n"),
expect: "A",
},
{
list: []string{"A", "B", "C"},
opts: &Options{
Default: "A",
},
userInput: bytes.NewBufferString("\n"),
expect: "A",
},
{
list: []string{"A", "B", "C"},
opts: &Options{
Default: "A",
},
userInput: bytes.NewBufferString("3\n"),
expect: "C",
},
// Loop
{
list: []string{"A", "B", "C"},
opts: &Options{
Loop: true,
},
userInput: bytes.NewBufferString("\n3\n"),
expect: "C",
},
// Loop
{
list: []string{"A", "B", "C"},
opts: &Options{
Loop: true,
},
userInput: bytes.NewBufferString("\n\n\n\n\n2\n"),
expect: "B",
},
// Loop
{
list: []string{"A", "B", "C"},
opts: &Options{
Loop: true,
},
userInput: bytes.NewBufferString("4\n3\n"),
expect: "C",
},
// Loop
{
list: []string{"A", "B", "C"},
opts: &Options{
Loop: true,
},
userInput: bytes.NewBufferString("A\n3\n"),
expect: "C",
},
}
for i, c := range cases {
ui := &UI{
Writer: ioutil.Discard,
Reader: c.userInput,
}
ans, err := ui.Select("", c.list, c.opts)
if err != nil {
t.Fatalf("#%d expect not to occurr error: %s", i, err)
}
if ans != c.expect {
t.Fatalf("#%d expect %q to be eq %q", i, ans, c.expect)
}
}
}
func TestSelect_invalidDefault(t *testing.T) {
ui := &UI{
Writer: ioutil.Discard,
}
_, err := ui.Select("Which?", []string{"A", "B", "C"}, &Options{
// "D" is not in select target list
Default: "D",
})
if err == nil {
t.Fatal("expect err to be occurr")
}
}
func ExampleUI_Select() {
ui := &UI{
// In real world, Reader is os.Stdin and input comes
// from user actual input.
Reader: bytes.NewBufferString("3\n"),
Writer: ioutil.Discard,
}
query := "Which language do you prefer to use?"
lang, _ := ui.Select(query, []string{"go", "Go", "golang"}, &Options{
Default: "Go",
})
fmt.Println(lang)
// Output: golang
}
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