github.com/ph/moby@v1.13.1/pkg/ioutils/writers_test.go (about)

     1  package ioutils
     2  
     3  import (
     4  	"bytes"
     5  	"strings"
     6  	"testing"
     7  )
     8  
     9  func TestWriteCloserWrapperClose(t *testing.T) {
    10  	called := false
    11  	writer := bytes.NewBuffer([]byte{})
    12  	wrapper := NewWriteCloserWrapper(writer, func() error {
    13  		called = true
    14  		return nil
    15  	})
    16  	if err := wrapper.Close(); err != nil {
    17  		t.Fatal(err)
    18  	}
    19  	if !called {
    20  		t.Fatalf("writeCloserWrapper should have call the anonymous function.")
    21  	}
    22  }
    23  
    24  func TestNopWriteCloser(t *testing.T) {
    25  	writer := bytes.NewBuffer([]byte{})
    26  	wrapper := NopWriteCloser(writer)
    27  	if err := wrapper.Close(); err != nil {
    28  		t.Fatal("NopWriteCloser always return nil on Close.")
    29  	}
    30  
    31  }
    32  
    33  func TestNopWriter(t *testing.T) {
    34  	nw := &NopWriter{}
    35  	l, err := nw.Write([]byte{'c'})
    36  	if err != nil {
    37  		t.Fatal(err)
    38  	}
    39  	if l != 1 {
    40  		t.Fatalf("Expected 1 got %d", l)
    41  	}
    42  }
    43  
    44  func TestWriteCounter(t *testing.T) {
    45  	dummy1 := "This is a dummy string."
    46  	dummy2 := "This is another dummy string."
    47  	totalLength := int64(len(dummy1) + len(dummy2))
    48  
    49  	reader1 := strings.NewReader(dummy1)
    50  	reader2 := strings.NewReader(dummy2)
    51  
    52  	var buffer bytes.Buffer
    53  	wc := NewWriteCounter(&buffer)
    54  
    55  	reader1.WriteTo(wc)
    56  	reader2.WriteTo(wc)
    57  
    58  	if wc.Count != totalLength {
    59  		t.Errorf("Wrong count: %d vs. %d", wc.Count, totalLength)
    60  	}
    61  
    62  	if buffer.String() != dummy1+dummy2 {
    63  		t.Error("Wrong message written")
    64  	}
    65  }