fuzztest.go

Documentation: google.golang.org/protobuf/internal/fuzztest

     1  // Copyright 2019 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 fuzztest contains a common fuzzer test.
     6  package fuzztest
     7  
     8  import (
     9  	"flag"
    10  	"io/ioutil"
    11  	"os"
    12  	"path/filepath"
    13  	"sort"
    14  	"testing"
    15  )
    16  
    17  var corpus = flag.String("corpus", "corpus", "directory containing the fuzzer corpus")
    18  
    19  // Test executes a fuzz function for every entry in the corpus.
    20  func Test(t *testing.T, fuzz func(b []byte) int) {
    21  	dir, err := os.Open(*corpus)
    22  	if err != nil {
    23  		t.Fatal(err)
    24  	}
    25  	infos, err := dir.Readdir(0)
    26  	if err != nil {
    27  		t.Fatal(err)
    28  
    29  	}
    30  	var names []string
    31  	for _, info := range infos {
    32  		names = append(names, info.Name())
    33  	}
    34  	sort.Strings(names)
    35  	for _, name := range names {
    36  		t.Run(name, func(t *testing.T) {
    37  			b, err := ioutil.ReadFile(filepath.Join(*corpus, name))
    38  			if err != nil {
    39  				t.Fatal(err)
    40  			}
    41  			b = b[:len(b):len(b)] // set cap to len
    42  			fuzz(b)
    43  		})
    44  	}
    45  }
    46
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