116 lines
2.7 KiB
Go
116 lines
2.7 KiB
Go
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package helper
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"testing"
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"testing/iotest"
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)
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func TestBusyReader(t *testing.T) {
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testData := "test data"
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r := testReader(testData)
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br, _ := NewWriteAfterReader(r, &bytes.Buffer{})
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result, err := ioutil.ReadAll(br)
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if err != nil {
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t.Fatal(err)
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}
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if string(result) != testData {
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t.Fatalf("expected %q, got %q", testData, result)
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}
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}
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func TestFirstWriteAfterReadDone(t *testing.T) {
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writeRecorder := &bytes.Buffer{}
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br, cw := NewWriteAfterReader(&bytes.Buffer{}, writeRecorder)
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if _, err := io.Copy(ioutil.Discard, br); err != nil {
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t.Fatalf("copy from busyreader: %v", err)
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}
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testData := "test data"
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if _, err := io.Copy(cw, testReader(testData)); err != nil {
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t.Fatalf("copy test data: %v", err)
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}
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if err := cw.Flush(); err != nil {
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t.Fatalf("flush error: %v", err)
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}
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if result := writeRecorder.String(); result != testData {
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t.Fatalf("expected %q, got %q", testData, result)
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}
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}
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func TestWriteDelay(t *testing.T) {
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writeRecorder := &bytes.Buffer{}
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w := &complainingWriter{Writer: writeRecorder}
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br, cw := NewWriteAfterReader(&bytes.Buffer{}, w)
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testData1 := "1 test"
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if _, err := io.Copy(cw, testReader(testData1)); err != nil {
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t.Fatalf("error on first copy: %v", err)
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}
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// Unblock the coupled writer by draining the reader
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if _, err := io.Copy(ioutil.Discard, br); err != nil {
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t.Fatalf("copy from busyreader: %v", err)
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}
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// Now it is no longer an error if 'w' receives a Write()
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w.CheerUp()
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testData2 := "2 experiment"
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if _, err := io.Copy(cw, testReader(testData2)); err != nil {
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t.Fatalf("error on second copy: %v", err)
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}
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if err := cw.Flush(); err != nil {
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t.Fatalf("flush error: %v", err)
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}
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expected := testData1 + testData2
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if result := writeRecorder.String(); result != expected {
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t.Fatalf("total write: expected %q, got %q", expected, result)
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}
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}
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func TestComplainingWriterSanity(t *testing.T) {
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recorder := &bytes.Buffer{}
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w := &complainingWriter{Writer: recorder}
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testData := "test data"
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if _, err := io.Copy(w, testReader(testData)); err == nil {
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t.Error("error expected, none received")
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}
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w.CheerUp()
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if _, err := io.Copy(w, testReader(testData)); err != nil {
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t.Errorf("copy after CheerUp: %v", err)
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}
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if result := recorder.String(); result != testData {
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t.Errorf("expected %q, got %q", testData, result)
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}
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}
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func testReader(data string) io.Reader {
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return iotest.OneByteReader(bytes.NewBuffer([]byte(data)))
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}
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type complainingWriter struct {
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happy bool
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io.Writer
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}
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func (comp *complainingWriter) Write(data []byte) (int, error) {
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if comp.happy {
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return comp.Writer.Write(data)
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}
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return 0, fmt.Errorf("I am unhappy about you wanting to write %q", data)
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}
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func (comp *complainingWriter) CheerUp() {
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comp.happy = true
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}
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