mod_test.go

     1  // Copyright 2022 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package debug_test
     6  
     7  import (
     8  	"reflect"
     9  	"runtime/debug"
    10  	"strings"
    11  	"testing"
    12  )
    13  
    14  // strip removes two leading tabs after each newline of s.
    15  func strip(s string) string {
    16  	replaced := strings.ReplaceAll(s, "\n\t\t", "\n")
    17  	if len(replaced) > 0 && replaced[0] == '\n' {
    18  		replaced = replaced[1:]
    19  	}
    20  	return replaced
    21  }
    22  
    23  func FuzzParseBuildInfoRoundTrip(f *testing.F) {
    24  	// Package built from outside a module, missing some fields..
    25  	f.Add(strip(`
    26  		path	rsc.io/fortune
    27  		mod	rsc.io/fortune	v1.0.0
    28  		`))
    29  
    30  	// Package built from the standard library, missing some fields..
    31  	f.Add(`path	cmd/test2json`)
    32  
    33  	// Package built from inside a module.
    34  	f.Add(strip(`
    35  		go	1.18
    36  		path	example.com/m
    37  		mod	example.com/m	(devel)
    38  		build	-compiler=gc
    39  		`))
    40  
    41  	// Package built in GOPATH mode.
    42  	f.Add(strip(`
    43  		go	1.18
    44  		path	example.com/m
    45  		build	-compiler=gc
    46  		`))
    47  
    48  	// Escaped build info.
    49  	f.Add(strip(`
    50  		go 1.18
    51  		path example.com/m
    52  		build CRAZY_ENV="requires\nescaping"
    53  		`))
    54  
    55  	f.Fuzz(func(t *testing.T, s string) {
    56  		bi, err := debug.ParseBuildInfo(s)
    57  		if err != nil {
    58  			// Not a round-trippable BuildInfo string.
    59  			t.Log(err)
    60  			return
    61  		}
    62  
    63  		// s2 could have different escaping from s.
    64  		// However, it should parse to exactly the same contents.
    65  		s2 := bi.String()
    66  		bi2, err := debug.ParseBuildInfo(s2)
    67  		if err != nil {
    68  			t.Fatalf("%v:\n%s", err, s2)
    69  		}
    70  
    71  		if !reflect.DeepEqual(bi2, bi) {
    72  			t.Fatalf("Parsed representation differs.\ninput:\n%s\noutput:\n%s", s, s2)
    73  		}
    74  	})
    75  }
    76
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