1 files changed, 61 insertions, 0 deletions
diff --git a/src/net/textproto/writer_test.go b/src/net/textproto/writer_test.go
new file mode 100644
index 0000000..8f11b10
--- /dev/null
+++ b/src/net/textproto/writer_test.go
@@ -0,0 +1,61 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package textproto
+
+import (
+	"bufio"
+	"strings"
+	"testing"
+)
+
+func TestPrintfLine(t *testing.T) {
+	var buf strings.Builder
+	w := NewWriter(bufio.NewWriter(&buf))
+	err := w.PrintfLine("foo %d", 123)
+	if s := buf.String(); s != "foo 123\r\n" || err != nil {
+		t.Fatalf("s=%q; err=%s", s, err)
+	}
+}
+
+func TestDotWriter(t *testing.T) {
+	var buf strings.Builder
+	w := NewWriter(bufio.NewWriter(&buf))
+	d := w.DotWriter()
+	n, err := d.Write([]byte("abc\n.def\n..ghi\n.jkl\n."))
+	if n != 21 || err != nil {
+		t.Fatalf("Write: %d, %s", n, err)
+	}
+	d.Close()
+	want := "abc\r\n..def\r\n...ghi\r\n..jkl\r\n..\r\n.\r\n"
+	if s := buf.String(); s != want {
+		t.Fatalf("wrote %q", s)
+	}
+}
+
+func TestDotWriterCloseEmptyWrite(t *testing.T) {
+	var buf strings.Builder
+	w := NewWriter(bufio.NewWriter(&buf))
+	d := w.DotWriter()
+	n, err := d.Write([]byte{})
+	if n != 0 || err != nil {
+		t.Fatalf("Write: %d, %s", n, err)
+	}
+	d.Close()
+	want := "\r\n.\r\n"
+	if s := buf.String(); s != want {
+		t.Fatalf("wrote %q; want %q", s, want)
+	}
+}
+
+func TestDotWriterCloseNoWrite(t *testing.T) {
+	var buf strings.Builder
+	w := NewWriter(bufio.NewWriter(&buf))
+	d := w.DotWriter()
+	d.Close()
+	want := "\r\n.\r\n"
+	if s := buf.String(); s != want {
+		t.Fatalf("wrote %q; want %q", s, want)
+	}
+}