github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/golang/groupcache/byteview_test.go (about)

     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  	"fmt"
    21  	"io"
    22  	"io/ioutil"
    23  	"testing"
    24  )
    25  
    26  func TestByteView(t *testing.T) {
    27  	for _, s := range []string{"", "x", "yy"} {
    28  		for _, v := range []ByteView{of([]byte(s)), of(s)} {
    29  			name := fmt.Sprintf("string %q, view %+v", s, v)
    30  			if v.Len() != len(s) {
    31  				t.Errorf("%s: Len = %d; want %d", name, v.Len(), len(s))
    32  			}
    33  			if v.String() != s {
    34  				t.Errorf("%s: String = %q; want %q", name, v.String(), s)
    35  			}
    36  			var longDest [3]byte
    37  			if n := v.Copy(longDest[:]); n != len(s) {
    38  				t.Errorf("%s: long Copy = %d; want %d", name, n, len(s))
    39  			}
    40  			var shortDest [1]byte
    41  			if n := v.Copy(shortDest[:]); n != min(len(s), 1) {
    42  				t.Errorf("%s: short Copy = %d; want %d", name, n, min(len(s), 1))
    43  			}
    44  			if got, err := ioutil.ReadAll(v.Reader()); err != nil || string(got) != s {
    45  				t.Errorf("%s: Reader = %q, %v; want %q", name, got, err, s)
    46  			}
    47  			if got, err := ioutil.ReadAll(io.NewSectionReader(v, 0, int64(len(s)))); err != nil || string(got) != s {
    48  				t.Errorf("%s: SectionReader of ReaderAt = %q, %v; want %q", name, got, err, s)
    49  			}
    50  		}
    51  	}
    52  }
    53  
    54  // of returns a byte view of the []byte or string in x.
    55  func of(x interface{}) ByteView {
    56  	if bytes, ok := x.([]byte); ok {
    57  		return ByteView{b: bytes}
    58  	}
    59  	return ByteView{s: x.(string)}
    60  }
    61  
    62  func TestByteViewEqual(t *testing.T) {
    63  	tests := []struct {
    64  		a    interface{} // string or []byte
    65  		b    interface{} // string or []byte
    66  		want bool
    67  	}{
    68  		{"x", "x", true},
    69  		{"x", "y", false},
    70  		{"x", "yy", false},
    71  		{[]byte("x"), []byte("x"), true},
    72  		{[]byte("x"), []byte("y"), false},
    73  		{[]byte("x"), []byte("yy"), false},
    74  		{[]byte("x"), "x", true},
    75  		{[]byte("x"), "y", false},
    76  		{[]byte("x"), "yy", false},
    77  		{"x", []byte("x"), true},
    78  		{"x", []byte("y"), false},
    79  		{"x", []byte("yy"), false},
    80  	}
    81  	for i, tt := range tests {
    82  		va := of(tt.a)
    83  		if bytes, ok := tt.b.([]byte); ok {
    84  			if got := va.EqualBytes(bytes); got != tt.want {
    85  				t.Errorf("%d. EqualBytes = %v; want %v", i, got, tt.want)
    86  			}
    87  		} else {
    88  			if got := va.EqualString(tt.b.(string)); got != tt.want {
    89  				t.Errorf("%d. EqualString = %v; want %v", i, got, tt.want)
    90  			}
    91  		}
    92  		if got := va.Equal(of(tt.b)); got != tt.want {
    93  			t.Errorf("%d. Equal = %v; want %v", i, got, tt.want)
    94  		}
    95  	}
    96  }
    97  
    98  func TestByteViewSlice(t *testing.T) {
    99  	tests := []struct {
   100  		in   string
   101  		from int
   102  		to   interface{} // nil to mean the end (SliceFrom); else int
   103  		want string
   104  	}{
   105  		{
   106  			in:   "abc",
   107  			from: 1,
   108  			to:   2,
   109  			want: "b",
   110  		},
   111  		{
   112  			in:   "abc",
   113  			from: 1,
   114  			want: "bc",
   115  		},
   116  		{
   117  			in:   "abc",
   118  			to:   2,
   119  			want: "ab",
   120  		},
   121  	}
   122  	for i, tt := range tests {
   123  		for _, v := range []ByteView{of([]byte(tt.in)), of(tt.in)} {
   124  			name := fmt.Sprintf("test %d, view %+v", i, v)
   125  			if tt.to != nil {
   126  				v = v.Slice(tt.from, tt.to.(int))
   127  			} else {
   128  				v = v.SliceFrom(tt.from)
   129  			}
   130  			if v.String() != tt.want {
   131  				t.Errorf("%s: got %q; want %q", name, v.String(), tt.want)
   132  			}
   133  		}
   134  	}
   135  }
   136  
   137  func min(a, b int) int {
   138  	if a < b {
   139  		return a
   140  	}
   141  	return b
   142  }