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Source file src/encoding/csv/writer_test.go

Documentation: encoding/csv

  // Copyright 2011 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package csv
  
  import (
  	"bytes"
  	"errors"
  	"testing"
  )
  
  var writeTests = []struct {
  	Input   [][]string
  	Output  string
  	UseCRLF bool
  }{
  	{Input: [][]string{{"abc"}}, Output: "abc\n"},
  	{Input: [][]string{{"abc"}}, Output: "abc\r\n", UseCRLF: true},
  	{Input: [][]string{{`"abc"`}}, Output: `"""abc"""` + "\n"},
  	{Input: [][]string{{`a"b`}}, Output: `"a""b"` + "\n"},
  	{Input: [][]string{{`"a"b"`}}, Output: `"""a""b"""` + "\n"},
  	{Input: [][]string{{" abc"}}, Output: `" abc"` + "\n"},
  	{Input: [][]string{{"abc,def"}}, Output: `"abc,def"` + "\n"},
  	{Input: [][]string{{"abc", "def"}}, Output: "abc,def\n"},
  	{Input: [][]string{{"abc"}, {"def"}}, Output: "abc\ndef\n"},
  	{Input: [][]string{{"abc\ndef"}}, Output: "\"abc\ndef\"\n"},
  	{Input: [][]string{{"abc\ndef"}}, Output: "\"abc\r\ndef\"\r\n", UseCRLF: true},
  	{Input: [][]string{{"abc\rdef"}}, Output: "\"abcdef\"\r\n", UseCRLF: true},
  	{Input: [][]string{{"abc\rdef"}}, Output: "\"abc\rdef\"\n", UseCRLF: false},
  	{Input: [][]string{{""}}, Output: "\n"},
  	{Input: [][]string{{"", ""}}, Output: ",\n"},
  	{Input: [][]string{{"", "", ""}}, Output: ",,\n"},
  	{Input: [][]string{{"", "", "a"}}, Output: ",,a\n"},
  	{Input: [][]string{{"", "a", ""}}, Output: ",a,\n"},
  	{Input: [][]string{{"", "a", "a"}}, Output: ",a,a\n"},
  	{Input: [][]string{{"a", "", ""}}, Output: "a,,\n"},
  	{Input: [][]string{{"a", "", "a"}}, Output: "a,,a\n"},
  	{Input: [][]string{{"a", "a", ""}}, Output: "a,a,\n"},
  	{Input: [][]string{{"a", "a", "a"}}, Output: "a,a,a\n"},
  	{Input: [][]string{{`\.`}}, Output: "\"\\.\"\n"},
  }
  
  func TestWrite(t *testing.T) {
  	for n, tt := range writeTests {
  		b := &bytes.Buffer{}
  		f := NewWriter(b)
  		f.UseCRLF = tt.UseCRLF
  		err := f.WriteAll(tt.Input)
  		if err != nil {
  			t.Errorf("Unexpected error: %s\n", err)
  		}
  		out := b.String()
  		if out != tt.Output {
  			t.Errorf("#%d: out=%q want %q", n, out, tt.Output)
  		}
  	}
  }
  
  type errorWriter struct{}
  
  func (e errorWriter) Write(b []byte) (int, error) {
  	return 0, errors.New("Test")
  }
  
  func TestError(t *testing.T) {
  	b := &bytes.Buffer{}
  	f := NewWriter(b)
  	f.Write([]string{"abc"})
  	f.Flush()
  	err := f.Error()
  
  	if err != nil {
  		t.Errorf("Unexpected error: %s\n", err)
  	}
  
  	f = NewWriter(errorWriter{})
  	f.Write([]string{"abc"})
  	f.Flush()
  	err = f.Error()
  
  	if err == nil {
  		t.Error("Error should not be nil")
  	}
  }
  

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