go4.org@v0.0.0-20230225012048-214862532bf5/readerutil/readersize_test.go (about)

     1  /*
     2  Copyright 2012 The Go4 Authors
     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 readerutil
    18  
    19  import (
    20  	"bytes"
    21  	"io"
    22  	"io/ioutil"
    23  	"os"
    24  	"testing"
    25  )
    26  
    27  const text = "HelloWorld"
    28  
    29  type testSrc struct {
    30  	name string
    31  	src  io.Reader
    32  	want int64
    33  }
    34  
    35  func (tsrc *testSrc) run(t *testing.T) {
    36  	n, ok := Size(tsrc.src)
    37  	if !ok {
    38  		t.Fatalf("failed to read size for %q", tsrc.name)
    39  	}
    40  	if n != tsrc.want {
    41  		t.Fatalf("wanted %v, got %v", tsrc.want, n)
    42  	}
    43  }
    44  
    45  func TestBytesBuffer(t *testing.T) {
    46  	buf := bytes.NewBuffer([]byte(text))
    47  	tsrc := &testSrc{"buffer", buf, int64(len(text))}
    48  	tsrc.run(t)
    49  }
    50  
    51  func TestSeeker(t *testing.T) {
    52  	f, err := ioutil.TempFile("", "camliTestReaderSize")
    53  	if err != nil {
    54  		t.Fatal(err)
    55  	}
    56  	defer os.Remove(f.Name())
    57  	defer f.Close()
    58  	size, err := f.Write([]byte(text))
    59  	if err != nil {
    60  		t.Fatal(err)
    61  	}
    62  	pos, err := f.Seek(5, 0)
    63  	if err != nil {
    64  		t.Fatal(err)
    65  	}
    66  	tsrc := &testSrc{"seeker", f, int64(size) - pos}
    67  	tsrc.run(t)
    68  }