130 lines
2.6 KiB
Go
130 lines
2.6 KiB
Go
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// Copyright 2011 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 main
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import (
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"go/ast"
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"go/parser"
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"strings"
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"testing"
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)
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type testCase struct {
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Name string
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Fn func(*ast.File) bool
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In string
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Out string
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}
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var testCases []testCase
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func addTestCases(t []testCase, fn func(*ast.File) bool) {
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// Fill in fn to avoid repetition in definitions.
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if fn != nil {
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for i := range t {
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if t[i].Fn == nil {
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t[i].Fn = fn
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}
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}
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}
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testCases = append(testCases, t...)
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}
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func fnop(*ast.File) bool { return false }
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func parseFixPrint(t *testing.T, fn func(*ast.File) bool, desc, in string, mustBeGofmt bool) (out string, fixed, ok bool) {
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file, err := parser.ParseFile(fset, desc, in, parserMode)
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if err != nil {
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t.Errorf("%s: parsing: %v", desc, err)
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return
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}
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outb, err := gofmtFile(file)
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if err != nil {
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t.Errorf("%s: printing: %v", desc, err)
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return
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}
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if s := string(outb); in != s && mustBeGofmt {
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t.Errorf("%s: not gofmt-formatted.\n--- %s\n%s\n--- %s | gofmt\n%s",
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desc, desc, in, desc, s)
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tdiff(t, in, s)
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return
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}
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if fn == nil {
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for _, fix := range fixes {
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if fix.f(file) {
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fixed = true
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}
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}
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} else {
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fixed = fn(file)
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}
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outb, err = gofmtFile(file)
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if err != nil {
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t.Errorf("%s: printing: %v", desc, err)
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return
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}
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return string(outb), fixed, true
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}
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func TestRewrite(t *testing.T) {
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for _, tt := range testCases {
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// Apply fix: should get tt.Out.
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out, fixed, ok := parseFixPrint(t, tt.Fn, tt.Name, tt.In, true)
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if !ok {
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continue
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}
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// reformat to get printing right
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out, _, ok = parseFixPrint(t, fnop, tt.Name, out, false)
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if !ok {
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continue
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}
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if out != tt.Out {
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t.Errorf("%s: incorrect output.\n", tt.Name)
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if !strings.HasPrefix(tt.Name, "testdata/") {
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t.Errorf("--- have\n%s\n--- want\n%s", out, tt.Out)
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}
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tdiff(t, out, tt.Out)
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continue
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}
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if changed := out != tt.In; changed != fixed {
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t.Errorf("%s: changed=%v != fixed=%v", tt.Name, changed, fixed)
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continue
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}
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// Should not change if run again.
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out2, fixed2, ok := parseFixPrint(t, tt.Fn, tt.Name+" output", out, true)
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if !ok {
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continue
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}
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if fixed2 {
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t.Errorf("%s: applied fixes during second round", tt.Name)
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continue
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}
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if out2 != out {
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t.Errorf("%s: changed output after second round of fixes.\n--- output after first round\n%s\n--- output after second round\n%s",
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tt.Name, out, out2)
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tdiff(t, out, out2)
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}
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}
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}
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func tdiff(t *testing.T, a, b string) {
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data, err := diff([]byte(a), []byte(b))
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if err != nil {
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t.Error(err)
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return
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}
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t.Error(string(data))
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}
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