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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.
//go:build go1.18
// +build go1.18
package typeparams_test
import (
"go/ast"
"go/importer"
"go/parser"
"go/token"
"go/types"
"strings"
"testing"
"golang.org/x/tools/internal/apidiff"
"golang.org/x/tools/internal/testenv"
)
func TestAPIConsistency(t *testing.T) {
testenv.NeedsGoBuild(t) // This is a lie. We actually need the source code.
// The packages below exclude enabled_*.go, as typeparams.Enabled is
// permitted to change between versions.
old := typeCheck(t, []string{"common.go", "typeparams_go117.go"})
new := typeCheck(t, []string{"common.go", "typeparams_go118.go"})
report := apidiff.Changes(old, new)
// Temporarily ignore API diff related to Environment, so that we can use a
// transient alias in go/types to allow renaming this type without ever
// breaking the x/tools builder.
// TODO(rfindley): remove this
var filteredChanges []apidiff.Change
for _, change := range report.Changes {
if strings.Contains(change.Message, "Environment") {
continue
}
filteredChanges = append(filteredChanges, change)
}
report.Changes = filteredChanges
if len(report.Changes) > 0 {
t.Errorf("API diff:\n%s", report)
}
}
func typeCheck(t *testing.T, filenames []string) *types.Package {
fset := token.NewFileSet()
var files []*ast.File
for _, name := range filenames {
f, err := parser.ParseFile(fset, name, nil, 0)
if err != nil {
t.Fatal(err)
}
files = append(files, f)
}
conf := types.Config{
Importer: importer.Default(),
}
pkg, err := conf.Check("", fset, files, nil)
if err != nil {
t.Fatal(err)
}
return pkg
}
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