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// Copyright 2021 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 diagnostics
import (
"testing"
"golang.org/x/tools/gopls/internal/lsp/protocol"
. "golang.org/x/tools/gopls/internal/lsp/regtest"
)
func TestUndeclaredDiagnostics(t *testing.T) {
src := `
-- go.mod --
module mod.com
go 1.12
-- a/a.go --
package a
func _() int {
return x
}
-- b/b.go --
package b
func _() int {
var y int
y = y
return y
}
`
Run(t, src, func(t *testing.T, env *Env) {
isUnnecessary := func(diag protocol.Diagnostic) bool {
for _, tag := range diag.Tags {
if tag == protocol.Unnecessary {
return true
}
}
return false
}
// 'x' is undeclared, but still necessary.
env.OpenFile("a/a.go")
env.Await(env.DiagnosticAtRegexp("a/a.go", "x"))
diags := env.Awaiter.DiagnosticsFor("a/a.go")
if got := len(diags.Diagnostics); got != 1 {
t.Errorf("len(Diagnostics) = %d, want 1", got)
}
if diag := diags.Diagnostics[0]; isUnnecessary(diag) {
t.Errorf("%v tagged unnecessary, want necessary", diag)
}
// 'y = y' is pointless, and should be detected as unnecessary.
env.OpenFile("b/b.go")
env.Await(env.DiagnosticAtRegexp("b/b.go", "y = y"))
diags = env.Awaiter.DiagnosticsFor("b/b.go")
if got := len(diags.Diagnostics); got != 1 {
t.Errorf("len(Diagnostics) = %d, want 1", got)
}
if diag := diags.Diagnostics[0]; !isUnnecessary(diag) {
t.Errorf("%v tagged necessary, want unnecessary", diag)
}
})
}
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