github.com/datastax/go-cassandra-native-protocol@v0.0.0-20220706104457-5e8aad05cf90/primitive/string_test.go (about)

     1  // Copyright 2020 DataStax
     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 primitive
    16  
    17  import (
    18  	"bytes"
    19  	"errors"
    20  	"fmt"
    21  	"io/ioutil"
    22  	"testing"
    23  
    24  	"github.com/stretchr/testify/assert"
    25  )
    26  
    27  const (
    28  	d = byte('d')
    29  	e = byte('e')
    30  	h = byte('h')
    31  	k = byte('k')
    32  	l = byte('l')
    33  	m = byte('m')
    34  	n = byte('n')
    35  	o = byte('o')
    36  	r = byte('r')
    37  	u = byte('u')
    38  	w = byte('w')
    39  )
    40  
    41  func TestReadString(t *testing.T) {
    42  	tests := []struct {
    43  		name      string
    44  		source    []byte
    45  		expected  string
    46  		remaining []byte
    47  		err       error
    48  	}{
    49  		{"simple string", []byte{0, 5, h, e, l, l, o}, "hello", []byte{}, nil},
    50  		{"string with remaining", []byte{0, 5, h, e, l, l, o, 1, 2, 3, 4}, "hello", []byte{1, 2, 3, 4}, nil},
    51  		{"empty string", []byte{0, 0}, "", []byte{}, nil},
    52  		{"non-ASCII string", []byte{
    53  			0, 15, // length
    54  			0xce, 0xb3, 0xce, 0xb5, 0xce, 0xb9, 0xce, 0xac, //γειά
    55  			0x20,                               // space
    56  			0xcf, 0x83, 0xce, 0xbf, 0xcf, 0x85, // σου
    57  		}, "γειά σου", []byte{}, nil},
    58  		{
    59  			"cannot read length",
    60  			[]byte{0},
    61  			"",
    62  			[]byte{},
    63  			fmt.Errorf("cannot read [string] length: %w", fmt.Errorf("cannot read [short]: %w", errors.New("unexpected EOF"))),
    64  		},
    65  		{
    66  			"cannot read string",
    67  			[]byte{0, 5, h, e, l, l},
    68  			"",
    69  			[]byte{},
    70  			fmt.Errorf("cannot read [string] content: %w", errors.New("unexpected EOF")),
    71  		},
    72  	}
    73  	for _, tt := range tests {
    74  		t.Run(tt.name, func(t *testing.T) {
    75  			buf := bytes.NewReader(tt.source)
    76  			actual, err := ReadString(buf)
    77  			assert.Equal(t, tt.expected, actual)
    78  			assert.Equal(t, tt.err, err)
    79  			remaining, _ := ioutil.ReadAll(buf)
    80  			assert.Equal(t, tt.remaining, remaining)
    81  		})
    82  	}
    83  }
    84  
    85  func TestWriteString(t *testing.T) {
    86  	tests := []struct {
    87  		name     string
    88  		input    string
    89  		expected []byte
    90  		err      error
    91  	}{
    92  		{
    93  			"simple string",
    94  			"hello",
    95  			[]byte{0, 5, h, e, l, l, o},
    96  			nil,
    97  		},
    98  		{"empty string", "", []byte{0, 0}, nil},
    99  		{"non-ASCII string", "γειά σου", []byte{
   100  			0, 15, // length
   101  			0xce, 0xb3, 0xce, 0xb5, 0xce, 0xb9, 0xce, 0xac, //γειά
   102  			0x20,                               // space
   103  			0xcf, 0x83, 0xce, 0xbf, 0xcf, 0x85, // σου
   104  		}, nil},
   105  	}
   106  	for _, tt := range tests {
   107  		t.Run(tt.name, func(t *testing.T) {
   108  			buf := &bytes.Buffer{}
   109  			err := WriteString(tt.input, buf)
   110  			assert.Equal(t, tt.expected, buf.Bytes())
   111  			assert.Equal(t, tt.err, err)
   112  		})
   113  	}
   114  }