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71894ab67e
this makes sure that any diff implementation obeys the semantics we expect at higher layers Change-Id: Iae8842cfb9fece94ea71c04ec146d825eff0cbeb Reviewed-on: https://go-review.googlesource.com/c/tools/+/191017 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rebecca Stambler <rstambler@golang.org>
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package difftest supplies a set of tests that will operate on any
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// implementation of a diff algorithm as exposed by
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// "golang.org/x/tools/internal/lsp/diff"
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package difftest
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import (
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"testing"
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"golang.org/x/tools/internal/lsp/diff"
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"golang.org/x/tools/internal/span"
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)
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func DiffTest(t *testing.T) {
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t.Helper()
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for _, test := range []struct{ name, in, out, unified string }{{
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name: "empty",
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in: "",
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out: "",
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}, {
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name: "no_diff",
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in: "gargantuan",
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out: "gargantuan",
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}, {
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name: "insert_rune",
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in: "gord",
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out: "gourd",
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}, {
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name: "delete_rune",
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in: "groat",
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out: "goat",
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}, {
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name: "replace_rune",
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in: "loud",
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out: "lord",
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}, {
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name: "insert_line",
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in: "one\nthree\n",
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out: "one\ntwo\nthree\n",
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}} {
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edits := diff.ComputeEdits(span.FileURI("/"+test.name), test.in, test.out)
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got := diff.ApplyEdits(test.in, edits)
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if got != test.out {
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t.Logf("test %v had diff:%v\n", test.name, diff.ToUnified(test.name+".orig", test.name, test.in, edits))
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t.Errorf("diff %v got:\n%v\nexpected:\n%v", test.name, got, test.out)
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}
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}
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}
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