Add tests for pkg/pools

Fixes #11588

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

pkg/pools/pools_test.go

@@ -0,0 +1,162 @@
+package pools
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"strings"
+	"testing"
+)
+
+func TestBufioReaderPoolGetWithNoReaderShouldCreateOne(t *testing.T) {
+	reader := BufioReader32KPool.Get(nil)
+	if reader == nil {
+		t.Fatalf("BufioReaderPool should have create a bufio.Reader but did not.")
+	}
+}
+
+func TestBufioReaderPoolPutAndGet(t *testing.T) {
+	sr := bufio.NewReader(strings.NewReader("foobar"))
+	reader := BufioReader32KPool.Get(sr)
+	if reader == nil {
+		t.Fatalf("BufioReaderPool should not return a nil reader.")
+	}
+	// verify the first 3 byte
+	buf1 := make([]byte, 3)
+	_, err := reader.Read(buf1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if actual := string(buf1); actual != "foo" {
+		t.Fatalf("The first letter should have been 'foo' but was %v", actual)
+	}
+	BufioReader32KPool.Put(reader)
+	// Try to read the next 3 bytes
+	_, err = sr.Read(make([]byte, 3))
+	if err == nil || err != io.EOF {
+		t.Fatalf("The buffer should have been empty, issue an EOF error.")
+	}
+}
+
+type simpleReaderCloser struct {
+	io.Reader
+	closed bool
+}
+
+func (r *simpleReaderCloser) Close() error {
+	r.closed = true
+	return nil
+}
+
+func TestNewReadCloserWrapperWithAReadCloser(t *testing.T) {
+	br := bufio.NewReader(strings.NewReader(""))
+	sr := &simpleReaderCloser{
+		Reader: strings.NewReader("foobar"),
+		closed: false,
+	}
+	reader := BufioReader32KPool.NewReadCloserWrapper(br, sr)
+	if reader == nil {
+		t.Fatalf("NewReadCloserWrapper should not return a nil reader.")
+	}
+	// Verify the content of reader
+	buf := make([]byte, 3)
+	_, err := reader.Read(buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if actual := string(buf); actual != "foo" {
+		t.Fatalf("The first 3 letter should have been 'foo' but were %v", actual)
+	}
+	reader.Close()
+	// Read 3 more bytes "bar"
+	_, err = reader.Read(buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if actual := string(buf); actual != "bar" {
+		t.Fatalf("The first 3 letter should have been 'bar' but were %v", actual)
+	}
+	if !sr.closed {
+		t.Fatalf("The ReaderCloser should have been closed, it is not.")
+	}
+}
+
+func TestBufioWriterPoolGetWithNoReaderShouldCreateOne(t *testing.T) {
+	writer := BufioWriter32KPool.Get(nil)
+	if writer == nil {
+		t.Fatalf("BufioWriterPool should have create a bufio.Writer but did not.")
+	}
+}
+
+func TestBufioWriterPoolPutAndGet(t *testing.T) {
+	buf := new(bytes.Buffer)
+	bw := bufio.NewWriter(buf)
+	writer := BufioWriter32KPool.Get(bw)
+	if writer == nil {
+		t.Fatalf("BufioReaderPool should not return a nil writer.")
+	}
+	written, err := writer.Write([]byte("foobar"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if written != 6 {
+		t.Fatalf("Should have written 6 bytes, but wrote %v bytes", written)
+	}
+	// Make sure we Flush all the way ?
+	writer.Flush()
+	bw.Flush()
+	if len(buf.Bytes()) != 6 {
+		t.Fatalf("The buffer should contain 6 bytes ('foobar') but contains %v ('%v')", buf.Bytes(), string(buf.Bytes()))
+	}
+	// Reset the buffer
+	buf.Reset()
+	BufioWriter32KPool.Put(writer)
+	// Try to write something
+	written, err = writer.Write([]byte("barfoo"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	// If we now try to flush it, it should panic (the writer is nil)
+	// recover it
+	defer func() {
+		if r := recover(); r == nil {
+			t.Fatal("Trying to flush the writter should have 'paniced', did not.")
+		}
+	}()
+	writer.Flush()
+}
+
+type simpleWriterCloser struct {
+	io.Writer
+	closed bool
+}
+
+func (r *simpleWriterCloser) Close() error {
+	r.closed = true
+	return nil
+}
+
+func TestNewWriteCloserWrapperWithAWriteCloser(t *testing.T) {
+	buf := new(bytes.Buffer)
+	bw := bufio.NewWriter(buf)
+	sw := &simpleWriterCloser{
+		Writer: new(bytes.Buffer),
+		closed: false,
+	}
+	bw.Flush()
+	writer := BufioWriter32KPool.NewWriteCloserWrapper(bw, sw)
+	if writer == nil {
+		t.Fatalf("BufioReaderPool should not return a nil writer.")
+	}
+	written, err := writer.Write([]byte("foobar"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if written != 6 {
+		t.Fatalf("Should have written 6 bytes, but wrote %v bytes", written)
+	}
+	writer.Close()
+	if !sw.closed {
+		t.Fatalf("The ReaderCloser should have been closed, it is not.")
+	}
+}