github.com/sandwich-go/boost@v1.3.29/xio/xio_test.go (about)

     1  package xio
     2  
     3  import (
     4  	"bytes"
     5  	"context"
     6  	"io"
     7  	"testing"
     8  	"time"
     9  )
    10  
    11  func TestReader(t *testing.T) {
    12  	buf := []byte("abcdef")
    13  	buf2 := make([]byte, 3)
    14  	r := NewReader(context.Background(), bytes.NewReader(buf))
    15  
    16  	// read first half
    17  	n, err := r.Read(buf2)
    18  	if n != 3 {
    19  		t.Error("n should be 3")
    20  	}
    21  	if err != nil {
    22  		t.Error("should have no error")
    23  	}
    24  	if string(buf2) != string(buf[:3]) {
    25  		t.Error("incorrect contents")
    26  	}
    27  
    28  	// read second half
    29  	n, err = r.Read(buf2)
    30  	if n != 3 {
    31  		t.Error("n should be 3")
    32  	}
    33  	if err != nil {
    34  		t.Error("should have no error")
    35  	}
    36  	if string(buf2) != string(buf[3:6]) {
    37  		t.Error("incorrect contents")
    38  	}
    39  
    40  	// read more.
    41  	n, err = r.Read(buf2)
    42  	if n != 0 {
    43  		t.Error("n should be 0", n)
    44  	}
    45  	if err != io.EOF {
    46  		t.Error("should be EOF", err)
    47  	}
    48  
    49  	context.WithTimeout(context.Background(), 1*time.Second)
    50  	ctx, cancel := context.WithCancel(context.Background())
    51  	r = NewReader(ctx, bytes.NewReader(buf))
    52  	block = true
    53  	cancel()
    54  	_, err = r.Read(buf2)
    55  	if err == nil {
    56  		t.Error("should have error")
    57  	}
    58  }