github.com/hasnat/dolt/go@v0.0.0-20210628190320-9eb5d843fbb7/libraries/utils/iohelp/write_test.go (about)

     1  // Copyright 2019 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package iohelp
    16  
    17  import (
    18  	"errors"
    19  	"reflect"
    20  	"testing"
    21  
    22  	"github.com/dolthub/dolt/go/libraries/utils/test"
    23  )
    24  
    25  type test16ByteWriter struct {
    26  	Data []byte
    27  }
    28  
    29  func (tw *test16ByteWriter) Write(p []byte) (n int, err error) {
    30  	toCopy := 16
    31  	if len(p) < toCopy {
    32  		toCopy = len(p)
    33  	}
    34  
    35  	tw.Data = append(tw.Data, p[:toCopy]...)
    36  
    37  	return toCopy, nil
    38  }
    39  
    40  func TestWriteAll(t *testing.T) {
    41  	t16 := &test16ByteWriter{}
    42  	data := test.RandomData(1000)
    43  
    44  	err := WriteAll(t16, data)
    45  
    46  	if err != nil {
    47  		t.Error("Unexpected error", err)
    48  	}
    49  
    50  	if !reflect.DeepEqual(data, t16.Data) {
    51  		t.Error("Failed to write correctly")
    52  	}
    53  }
    54  
    55  func TestWriteNoErrWrites(t *testing.T) {
    56  	t16 := &test16ByteWriter{}
    57  	data := test.RandomData(32)
    58  
    59  	var prim int32
    60  	err := WritePrimIfNoErr(t16, prim, nil)
    61  
    62  	if err != nil {
    63  		t.Error("Unexpected error")
    64  	}
    65  
    66  	err = WriteIfNoErr(t16, data, err)
    67  
    68  	if err != nil {
    69  		t.Error("Unexpected error")
    70  	}
    71  
    72  	sizeAfterSuccesses := len(t16.Data)
    73  
    74  	err = errors.New("some error")
    75  	WritePrimIfNoErr(t16, prim, err)
    76  
    77  	if err == nil {
    78  		t.Error("Expected error")
    79  	}
    80  
    81  	err = WriteIfNoErr(t16, data, err)
    82  
    83  	if err == nil {
    84  		t.Error("Expected error")
    85  	}
    86  
    87  	if len(t16.Data) != sizeAfterSuccesses {
    88  		t.Error("Should not have written data after err set to non nil.")
    89  	}
    90  }
    91  
    92  func TestWriteLine(t *testing.T) {
    93  	lineStr := "This is a test of writing a line."
    94  
    95  	t16 := &test16ByteWriter{}
    96  	err := WriteLine(t16, lineStr)
    97  
    98  	if err != nil {
    99  		t.Error("Unexpected error", err)
   100  	}
   101  
   102  	resultStr := string(t16.Data)
   103  	if resultStr != lineStr+"\n" {
   104  		t.Errorf(`"%s" != "%s"`, resultStr, lineStr)
   105  	}
   106  }