зеркало из https://github.com/microsoft/docker.git
127 строки
2.8 KiB
Go
127 строки
2.8 KiB
Go
package docker
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import (
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"bytes"
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"errors"
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"io"
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"io/ioutil"
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"testing"
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)
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func TestBufReader(t *testing.T) {
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reader, writer := io.Pipe()
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bufreader := newBufReader(reader)
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// Write everything down to a Pipe
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// Usually, a pipe should block but because of the buffered reader,
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// the writes will go through
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done := make(chan bool)
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go func() {
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writer.Write([]byte("hello world"))
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writer.Close()
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done <- true
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}()
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// Drain the reader *after* everything has been written, just to verify
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// it is indeed buffering
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<-done
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output, err := ioutil.ReadAll(bufreader)
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(output, []byte("hello world")) {
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t.Error(string(output))
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}
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}
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type dummyWriter struct {
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buffer bytes.Buffer
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failOnWrite bool
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}
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func (dw *dummyWriter) Write(p []byte) (n int, err error) {
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if dw.failOnWrite {
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return 0, errors.New("Fake fail")
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}
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return dw.buffer.Write(p)
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}
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func (dw *dummyWriter) String() string {
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return dw.buffer.String()
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}
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func (dw *dummyWriter) Close() error {
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return nil
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}
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func TestWriteBroadcaster(t *testing.T) {
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writer := newWriteBroadcaster()
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// Test 1: Both bufferA and bufferB should contain "foo"
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bufferA := &dummyWriter{}
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writer.AddWriter(bufferA)
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bufferB := &dummyWriter{}
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writer.AddWriter(bufferB)
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writer.Write([]byte("foo"))
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if bufferA.String() != "foo" {
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t.Errorf("Buffer contains %v", bufferA.String())
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}
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if bufferB.String() != "foo" {
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t.Errorf("Buffer contains %v", bufferB.String())
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}
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// Test2: bufferA and bufferB should contain "foobar",
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// while bufferC should only contain "bar"
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bufferC := &dummyWriter{}
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writer.AddWriter(bufferC)
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writer.Write([]byte("bar"))
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if bufferA.String() != "foobar" {
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t.Errorf("Buffer contains %v", bufferA.String())
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}
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if bufferB.String() != "foobar" {
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t.Errorf("Buffer contains %v", bufferB.String())
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}
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if bufferC.String() != "bar" {
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t.Errorf("Buffer contains %v", bufferC.String())
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}
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// Test3: Test removal
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writer.RemoveWriter(bufferB)
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writer.Write([]byte("42"))
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if bufferA.String() != "foobar42" {
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t.Errorf("Buffer contains %v", bufferA.String())
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}
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if bufferB.String() != "foobar" {
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t.Errorf("Buffer contains %v", bufferB.String())
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}
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if bufferC.String() != "bar42" {
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t.Errorf("Buffer contains %v", bufferC.String())
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}
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// Test4: Test eviction on failure
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bufferA.failOnWrite = true
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writer.Write([]byte("fail"))
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if bufferA.String() != "foobar42" {
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t.Errorf("Buffer contains %v", bufferA.String())
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}
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if bufferC.String() != "bar42fail" {
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t.Errorf("Buffer contains %v", bufferC.String())
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}
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// Even though we reset the flag, no more writes should go in there
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bufferA.failOnWrite = false
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writer.Write([]byte("test"))
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if bufferA.String() != "foobar42" {
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t.Errorf("Buffer contains %v", bufferA.String())
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}
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if bufferC.String() != "bar42failtest" {
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t.Errorf("Buffer contains %v", bufferC.String())
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}
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writer.Close()
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}
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