go.tools/go/types: add self test

R=adonovan
CC=golang-dev
https://golang.org/cl/11739043

go/types/self_test.go

@@ -0,0 +1,60 @@
+// Copyright 2013 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 types
+
+import (
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"testing"
+	"time"
+)
+
+func TestSelf(t *testing.T) {
+	filenames := pkgfiles(t, ".") // from stdlib_test.go
+
+	// parse package files
+	fset := token.NewFileSet()
+	var files []*ast.File
+	for _, filename := range filenames {
+		file, err := parser.ParseFile(fset, filename, nil, 0)
+		if err != nil {
+			t.Fatal(err)
+		}
+		files = append(files, file)
+	}
+
+	_, err := Check("go/types", fset, files)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if testing.Short() {
+		return // skip benchmark in short mode
+	}
+
+	b := testing.Benchmark(func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			Check("go/types", fset, files)
+		}
+	})
+
+	// determine line count
+	lineCount := 0
+	fset.Iterate(func(f *token.File) bool {
+		lineCount += f.LineCount()
+		return true
+	})
+
+	d := time.Duration(b.NsPerOp())
+	fmt.Printf(
+		"%s/op, %d lines/s, %d KB/op (%d iterations)\n",
+		d,
+		int64(float64(lineCount)/d.Seconds()),
+		b.AllocedBytesPerOp()>>10,
+		b.N,
+	)
+}