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// Copyright 2022 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 bench
import (
"fmt"
"testing"
"golang.org/x/tools/gopls/internal/lsp/fake"
)
// BenchmarkDidChange benchmarks modifications of a single file by making
// synthetic modifications in a comment. It controls pacing by waiting for the
// server to actually start processing the didChange notification before
// proceeding. Notably it does not wait for diagnostics to complete.
//
// Uses -workdir and -file to control where the edits occur.
func BenchmarkDidChange(b *testing.B) {
env := benchmarkEnv(b)
env.OpenFile(*file)
env.Await(env.DoneWithOpen())
// Insert the text we'll be modifying at the top of the file.
env.EditBuffer(*file, fake.Edit{Text: "// __REGTEST_PLACEHOLDER_0__\n"})
b.ResetTimer()
for i := 0; i < b.N; i++ {
env.EditBuffer(*file, fake.Edit{
Start: fake.Pos{Line: 0, Column: 0},
End: fake.Pos{Line: 1, Column: 0},
// Increment the placeholder text, to ensure cache misses.
Text: fmt.Sprintf("// __REGTEST_PLACEHOLDER_%d__\n", i+1),
})
env.Await(env.StartedChange())
}
}
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