byteview_test.go

Documentation: github.com/golang/groupcache

     1  /*
     2  Copyright 2012 Google Inc.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8       http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package groupcache
    18  
    19  import (
    20  	"bytes"
    21  	"fmt"
    22  	"io"
    23  	"io/ioutil"
    24  	"testing"
    25  )
    26  
    27  func TestByteView(t *testing.T) {
    28  	for _, s := range []string{"", "x", "yy"} {
    29  		for _, v := range []ByteView{of([]byte(s)), of(s)} {
    30  			name := fmt.Sprintf("string %q, view %+v", s, v)
    31  			if v.Len() != len(s) {
    32  				t.Errorf("%s: Len = %d; want %d", name, v.Len(), len(s))
    33  			}
    34  			if v.String() != s {
    35  				t.Errorf("%s: String = %q; want %q", name, v.String(), s)
    36  			}
    37  			var longDest [3]byte
    38  			if n := v.Copy(longDest[:]); n != len(s) {
    39  				t.Errorf("%s: long Copy = %d; want %d", name, n, len(s))
    40  			}
    41  			var shortDest [1]byte
    42  			if n := v.Copy(shortDest[:]); n != min(len(s), 1) {
    43  				t.Errorf("%s: short Copy = %d; want %d", name, n, min(len(s), 1))
    44  			}
    45  			if got, err := ioutil.ReadAll(v.Reader()); err != nil || string(got) != s {
    46  				t.Errorf("%s: Reader = %q, %v; want %q", name, got, err, s)
    47  			}
    48  			if got, err := ioutil.ReadAll(io.NewSectionReader(v, 0, int64(len(s)))); err != nil || string(got) != s {
    49  				t.Errorf("%s: SectionReader of ReaderAt = %q, %v; want %q", name, got, err, s)
    50  			}
    51  			var dest bytes.Buffer
    52  			if _, err := v.WriteTo(&dest); err != nil || !bytes.Equal(dest.Bytes(), []byte(s)) {
    53  				t.Errorf("%s: WriteTo = %q, %v; want %q", name, dest.Bytes(), err, s)
    54  			}
    55  		}
    56  	}
    57  }
    58  
    59  // of returns a byte view of the []byte or string in x.
    60  func of(x interface{}) ByteView {
    61  	if bytes, ok := x.([]byte); ok {
    62  		return ByteView{b: bytes}
    63  	}
    64  	return ByteView{s: x.(string)}
    65  }
    66  
    67  func TestByteViewEqual(t *testing.T) {
    68  	tests := []struct {
    69  		a    interface{} // string or []byte
    70  		b    interface{} // string or []byte
    71  		want bool
    72  	}{
    73  		{"x", "x", true},
    74  		{"x", "y", false},
    75  		{"x", "yy", false},
    76  		{[]byte("x"), []byte("x"), true},
    77  		{[]byte("x"), []byte("y"), false},
    78  		{[]byte("x"), []byte("yy"), false},
    79  		{[]byte("x"), "x", true},
    80  		{[]byte("x"), "y", false},
    81  		{[]byte("x"), "yy", false},
    82  		{"x", []byte("x"), true},
    83  		{"x", []byte("y"), false},
    84  		{"x", []byte("yy"), false},
    85  	}
    86  	for i, tt := range tests {
    87  		va := of(tt.a)
    88  		if bytes, ok := tt.b.([]byte); ok {
    89  			if got := va.EqualBytes(bytes); got != tt.want {
    90  				t.Errorf("%d. EqualBytes = %v; want %v", i, got, tt.want)
    91  			}
    92  		} else {
    93  			if got := va.EqualString(tt.b.(string)); got != tt.want {
    94  				t.Errorf("%d. EqualString = %v; want %v", i, got, tt.want)
    95  			}
    96  		}
    97  		if got := va.Equal(of(tt.b)); got != tt.want {
    98  			t.Errorf("%d. Equal = %v; want %v", i, got, tt.want)
    99  		}
   100  	}
   101  }
   102  
   103  func TestByteViewSlice(t *testing.T) {
   104  	tests := []struct {
   105  		in   string
   106  		from int
   107  		to   interface{} // nil to mean the end (SliceFrom); else int
   108  		want string
   109  	}{
   110  		{
   111  			in:   "abc",
   112  			from: 1,
   113  			to:   2,
   114  			want: "b",
   115  		},
   116  		{
   117  			in:   "abc",
   118  			from: 1,
   119  			want: "bc",
   120  		},
   121  		{
   122  			in:   "abc",
   123  			to:   2,
   124  			want: "ab",
   125  		},
   126  	}
   127  	for i, tt := range tests {
   128  		for _, v := range []ByteView{of([]byte(tt.in)), of(tt.in)} {
   129  			name := fmt.Sprintf("test %d, view %+v", i, v)
   130  			if tt.to != nil {
   131  				v = v.Slice(tt.from, tt.to.(int))
   132  			} else {
   133  				v = v.SliceFrom(tt.from)
   134  			}
   135  			if v.String() != tt.want {
   136  				t.Errorf("%s: got %q; want %q", name, v.String(), tt.want)
   137  			}
   138  		}
   139  	}
   140  }
   141  
   142  func min(a, b int) int {
   143  	if a < b {
   144  		return a
   145  	}
   146  	return b
   147  }
   148
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