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package ioutil
import (
"bytes"
"context"
"io/ioutil"
"strings"
"testing"
. "gopkg.in/check.v1"
)
func Test(t *testing.T) { TestingT(t) }
type CommonSuite struct{}
var _ = Suite(&CommonSuite{})
type closer struct {
called int
}
func (c *closer) Close() error {
c.called++
return nil
}
func (s *CommonSuite) TestNonEmptyReader_Empty(c *C) {
var buf bytes.Buffer
r, err := NonEmptyReader(&buf)
c.Assert(err, Equals, ErrEmptyReader)
c.Assert(r, IsNil)
}
func (s *CommonSuite) TestNonEmptyReader_NonEmpty(c *C) {
buf := bytes.NewBuffer([]byte("1"))
r, err := NonEmptyReader(buf)
c.Assert(err, IsNil)
c.Assert(r, NotNil)
read, err := ioutil.ReadAll(r)
c.Assert(err, IsNil)
c.Assert(string(read), Equals, "1")
}
func (s *CommonSuite) TestNewReadCloser(c *C) {
buf := bytes.NewBuffer([]byte("1"))
closer := &closer{}
r := NewReadCloser(buf, closer)
read, err := ioutil.ReadAll(r)
c.Assert(err, IsNil)
c.Assert(string(read), Equals, "1")
c.Assert(r.Close(), IsNil)
c.Assert(closer.called, Equals, 1)
}
func (s *CommonSuite) TestNewContextReader(c *C) {
buf := bytes.NewBuffer([]byte("12"))
ctx, close := context.WithCancel(context.Background())
r := NewContextReader(ctx, buf)
b := make([]byte, 1)
n, err := r.Read(b)
c.Assert(n, Equals, 1)
c.Assert(err, IsNil)
close()
n, err = r.Read(b)
c.Assert(n, Equals, 0)
c.Assert(err, NotNil)
}
func (s *CommonSuite) TestNewContextReadCloser(c *C) {
buf := NewReadCloser(bytes.NewBuffer([]byte("12")), &closer{})
ctx, close := context.WithCancel(context.Background())
r := NewContextReadCloser(ctx, buf)
b := make([]byte, 1)
n, err := r.Read(b)
c.Assert(n, Equals, 1)
c.Assert(err, IsNil)
close()
n, err = r.Read(b)
c.Assert(n, Equals, 0)
c.Assert(err, NotNil)
c.Assert(r.Close(), IsNil)
}
func (s *CommonSuite) TestNewContextWriter(c *C) {
buf := bytes.NewBuffer(nil)
ctx, close := context.WithCancel(context.Background())
r := NewContextWriter(ctx, buf)
n, err := r.Write([]byte("1"))
c.Assert(n, Equals, 1)
c.Assert(err, IsNil)
close()
n, err = r.Write([]byte("1"))
c.Assert(n, Equals, 0)
c.Assert(err, NotNil)
}
func (s *CommonSuite) TestNewContextWriteCloser(c *C) {
buf := NewWriteCloser(bytes.NewBuffer(nil), &closer{})
ctx, close := context.WithCancel(context.Background())
w := NewContextWriteCloser(ctx, buf)
n, err := w.Write([]byte("1"))
c.Assert(n, Equals, 1)
c.Assert(err, IsNil)
close()
n, err = w.Write([]byte("1"))
c.Assert(n, Equals, 0)
c.Assert(err, NotNil)
c.Assert(w.Close(), IsNil)
}
func (s *CommonSuite) TestNewWriteCloserOnError(c *C) {
buf := NewWriteCloser(bytes.NewBuffer(nil), &closer{})
ctx, close := context.WithCancel(context.Background())
var called error
w := NewWriteCloserOnError(NewContextWriteCloser(ctx, buf), func(err error) {
called = err
})
close()
w.Write(nil)
c.Assert(called, NotNil)
}
func (s *CommonSuite) TestNewReadCloserOnError(c *C) {
buf := NewReadCloser(bytes.NewBuffer(nil), &closer{})
ctx, close := context.WithCancel(context.Background())
var called error
w := NewReadCloserOnError(NewContextReadCloser(ctx, buf), func(err error) {
called = err
})
close()
w.Read(nil)
c.Assert(called, NotNil)
}
func ExampleCheckClose() {
// CheckClose is commonly used with named return values
f := func() (err error) {
// Get a io.ReadCloser
r := ioutil.NopCloser(strings.NewReader("foo"))
// defer CheckClose call with an io.Closer and pointer to error
defer CheckClose(r, &err)
// ... work with r ...
// if err is not nil, CheckClose will assign any close errors to it
return err
}
err := f()
if err != nil {
panic(err)
}
}
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