package fourslash_test

import (
	"testing"

	"github.com/microsoft/typescript-go/internal/fourslash"
	. "github.com/microsoft/typescript-go/internal/fourslash/tests/util"
	"github.com/microsoft/typescript-go/internal/testutil"
)

func TestBasicBackspace(t *testing.T) {
	t.Parallel()
	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
	const content = `export {};
interface Point {
	x: number;
	y: number;/*b*/
}
declare const p: Point;
p./*a*/`
	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
	defer done()
	f.VerifyCompletions(t, "a", &fourslash.CompletionsExpectedList{
		IsIncomplete: false,
		ItemDefaults: &fourslash.CompletionsExpectedItemDefaults{
			CommitCharacters: &DefaultCommitCharacters,
		},
		Items: &fourslash.CompletionsExpectedItems{
			Includes: []fourslash.CompletionsExpectedItem{"y"},
		},
	})
	f.GoToMarker(t, "b")
	f.Backspace(t, 10) // `y: number;`
	f.VerifyCompletions(t, "a", &fourslash.CompletionsExpectedList{
		IsIncomplete: false,
		ItemDefaults: &fourslash.CompletionsExpectedItemDefaults{
			CommitCharacters: &DefaultCommitCharacters,
		},
		Items: &fourslash.CompletionsExpectedItems{
			Excludes: []string{"y"},
		},
	})
}
