mmap_test.go

Documentation: golang.org/x/exp/mmap

     1  // Copyright 2015 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 mmap
     6  
     7  import (
     8  	"bytes"
     9  	"io"
    10  	"os"
    11  	"testing"
    12  )
    13  
    14  func TestOpen(t *testing.T) {
    15  	const filename = "mmap_test.go"
    16  	r, err := Open(filename)
    17  	if err != nil {
    18  		t.Fatalf("Open: %v", err)
    19  	}
    20  	got := make([]byte, r.Len())
    21  	if _, err := r.ReadAt(got, 0); err != nil && err != io.EOF {
    22  		t.Fatalf("ReadAt: %v", err)
    23  	}
    24  	want, err := os.ReadFile(filename)
    25  	if err != nil {
    26  		t.Fatalf("os.ReadFile: %v", err)
    27  	}
    28  	if len(got) != len(want) {
    29  		t.Fatalf("got %d bytes, want %d", len(got), len(want))
    30  	}
    31  	if !bytes.Equal(got, want) {
    32  		t.Fatalf("\ngot  %q\nwant %q", string(got), string(want))
    33  	}
    34  }
    35
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