github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/util/sysutil/large_file_test.go (about)

     1  // Copyright 2018 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package sysutil
    12  
    13  import (
    14  	"io/ioutil"
    15  	"os"
    16  	"testing"
    17  
    18  	"github.com/cockroachdb/errors"
    19  )
    20  
    21  func TestLargeFile(t *testing.T) {
    22  	f, err := ioutil.TempFile("", "input")
    23  	if err != nil {
    24  		t.Fatal(err)
    25  	}
    26  	fname := f.Name()
    27  	if err := f.Close(); err != nil {
    28  		t.Fatal(err)
    29  	}
    30  	const n int64 = 1013
    31  	if err := CreateLargeFile(fname, n); err != nil {
    32  		t.Fatal(err)
    33  	}
    34  	s, err := os.Stat(fname)
    35  	if err != nil {
    36  		t.Fatal(err)
    37  	}
    38  	if s.Size() != n {
    39  		t.Fatal(errors.Errorf("expected size of file %d, got %d", n, s.Size()))
    40  	}
    41  }