internal/lsp/fake/editor_test.go

// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package fake

import (
	"context"
	"testing"
)

func TestContentPosition(t *testing.T) {
	content := "foo\n😀\nbar"
	tests := []struct {
		offset, wantLine, wantColumn int
	}{
		{0, 0, 0},
		{3, 0, 3},
		{4, 1, 0},
		{5, 1, 1},
		{6, 2, 0},
	}
	for _, test := range tests {
		pos, err := contentPosition(content, test.offset)
		if err != nil {
			t.Fatal(err)
		}
		if pos.Line != test.wantLine {
			t.Errorf("contentPosition(%q, %d): Line = %d, want %d", content, test.offset, pos.Line, test.wantLine)
		}
		if pos.Column != test.wantColumn {
			t.Errorf("contentPosition(%q, %d): Column = %d, want %d", content, test.offset, pos.Column, test.wantColumn)
		}
	}
}

const exampleProgram = `
-- go.mod --
go 1.12
-- main.go --
package main

import "fmt"

func main() {
	fmt.Println("Hello World.")
}
`

func TestClientEditing(t *testing.T) {
	ws, err := NewSandbox(&SandboxConfig{Files: UnpackTxt(exampleProgram)})
	if err != nil {
		t.Fatal(err)
	}
	defer ws.Close()
	ctx := context.Background()
	editor := NewEditor(ws, EditorConfig{})
	if err := editor.OpenFile(ctx, "main.go"); err != nil {
		t.Fatal(err)
	}
	if err := editor.EditBuffer(ctx, "main.go", []Edit{
		{
			Start: Pos{5, 14},
			End:   Pos{5, 26},
			Text:  "Hola, mundo.",
		},
	}); err != nil {
		t.Fatal(err)
	}
	got := editor.buffers["main.go"].text()
	want := `package main

import "fmt"

func main() {
	fmt.Println("Hola, mundo.")
}
`
	if got != want {
		t.Errorf("got text %q, want %q", got, want)
	}
}