github.com/bhojpur/cache@v0.0.4/pkg/ioutils/readers_test.go (about)

     1  package ioutils
     2  
     3  // Copyright (c) 2018 Bhojpur Consulting Private Limited, India. All rights reserved.
     4  
     5  // Permission is hereby granted, free of charge, to any person obtaining a copy
     6  // of this software and associated documentation files (the "Software"), to deal
     7  // in the Software without restriction, including without limitation the rights
     8  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     9  // copies of the Software, and to permit persons to whom the Software is
    10  // furnished to do so, subject to the following conditions:
    11  
    12  // The above copyright notice and this permission notice shall be included in
    13  // all copies or substantial portions of the Software.
    14  
    15  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    16  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    17  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    18  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    19  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    20  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    21  // THE SOFTWARE.
    22  
    23  import (
    24  	"context"
    25  	"fmt"
    26  	"io"
    27  	"strings"
    28  	"testing"
    29  	"time"
    30  
    31  	"gotest.tools/v3/assert"
    32  	is "gotest.tools/v3/assert/cmp"
    33  )
    34  
    35  // Implement io.Reader
    36  type errorReader struct{}
    37  
    38  func (r *errorReader) Read(p []byte) (int, error) {
    39  	return 0, fmt.Errorf("error reader always fail")
    40  }
    41  
    42  func TestReadCloserWrapperClose(t *testing.T) {
    43  	reader := strings.NewReader("A string reader")
    44  	wrapper := NewReadCloserWrapper(reader, func() error {
    45  		return fmt.Errorf("This will be called when closing")
    46  	})
    47  	err := wrapper.Close()
    48  	if err == nil || !strings.Contains(err.Error(), "This will be called when closing") {
    49  		t.Fatalf("readCloserWrapper should have call the anonymous func and thus, fail.")
    50  	}
    51  }
    52  
    53  func TestReaderErrWrapperReadOnError(t *testing.T) {
    54  	called := false
    55  	reader := &errorReader{}
    56  	wrapper := NewReaderErrWrapper(reader, func() {
    57  		called = true
    58  	})
    59  	_, err := wrapper.Read([]byte{})
    60  	assert.Check(t, is.Error(err, "error reader always fail"))
    61  	if !called {
    62  		t.Fatalf("readErrWrapper should have call the anonymous function on failure")
    63  	}
    64  }
    65  
    66  func TestReaderErrWrapperRead(t *testing.T) {
    67  	reader := strings.NewReader("a string reader.")
    68  	wrapper := NewReaderErrWrapper(reader, func() {
    69  		t.Fatalf("readErrWrapper should not have called the anonymous function")
    70  	})
    71  	// Read 20 byte (should be ok with the string above)
    72  	num, err := wrapper.Read(make([]byte, 20))
    73  	if err != nil {
    74  		t.Fatal(err)
    75  	}
    76  	if num != 16 {
    77  		t.Fatalf("readerErrWrapper should have read 16 byte, but read %d", num)
    78  	}
    79  }
    80  
    81  type perpetualReader struct{}
    82  
    83  func (p *perpetualReader) Read(buf []byte) (n int, err error) {
    84  	for i := 0; i != len(buf); i++ {
    85  		buf[i] = 'a'
    86  	}
    87  	return len(buf), nil
    88  }
    89  
    90  func TestCancelReadCloser(t *testing.T) {
    91  	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
    92  	defer cancel()
    93  	cancelReadCloser := NewCancelReadCloser(ctx, io.NopCloser(&perpetualReader{}))
    94  	for {
    95  		var buf [128]byte
    96  		_, err := cancelReadCloser.Read(buf[:])
    97  		if err == context.DeadlineExceeded {
    98  			break
    99  		} else if err != nil {
   100  			t.Fatalf("got unexpected error: %v", err)
   101  		}
   102  	}
   103  }