Test net.Buffers{}

src/net/writev_test.go

@@ -0,0 +1,132 @@
+// The following is copied from Go 1.17 official implementation and
+// modified to accommodate TinyGo.
+
+// Copyright 2016 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 net
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"reflect"
+	"testing"
+)
+
+func TestBuffers_read(t *testing.T) {
+	const story = "once upon a time in Gopherland ... "
+	buffers := Buffers{
+		[]byte("once "),
+		[]byte("upon "),
+		[]byte("a "),
+		[]byte("time "),
+		[]byte("in "),
+		[]byte("Gopherland ... "),
+	}
+	got, err := io.ReadAll(&buffers)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(got) != story {
+		t.Errorf("read %q; want %q", got, story)
+	}
+	if len(buffers) != 0 {
+		t.Errorf("len(buffers) = %d; want 0", len(buffers))
+	}
+}
+
+func TestBuffers_consume(t *testing.T) {
+	tests := []struct {
+		in      Buffers
+		consume int64
+		want    Buffers
+	}{
+		{
+			in:      Buffers{[]byte("foo"), []byte("bar")},
+			consume: 0,
+			want:    Buffers{[]byte("foo"), []byte("bar")},
+		},
+		{
+			in:      Buffers{[]byte("foo"), []byte("bar")},
+			consume: 2,
+			want:    Buffers{[]byte("o"), []byte("bar")},
+		},
+		{
+			in:      Buffers{[]byte("foo"), []byte("bar")},
+			consume: 3,
+			want:    Buffers{[]byte("bar")},
+		},
+		{
+			in:      Buffers{[]byte("foo"), []byte("bar")},
+			consume: 4,
+			want:    Buffers{[]byte("ar")},
+		},
+		{
+			in:      Buffers{nil, nil, nil, []byte("bar")},
+			consume: 1,
+			want:    Buffers{[]byte("ar")},
+		},
+		{
+			in:      Buffers{nil, nil, nil, []byte("foo")},
+			consume: 0,
+			want:    Buffers{[]byte("foo")},
+		},
+		{
+			in:      Buffers{nil, nil, nil},
+			consume: 0,
+			want:    Buffers{},
+		},
+	}
+	for i, tt := range tests {
+		in := tt.in
+		in.consume(tt.consume)
+		if !reflect.DeepEqual(in, tt.want) {
+			t.Errorf("%d. after consume(%d) = %+v, want %+v", i, tt.consume, in, tt.want)
+		}
+	}
+}
+
+func TestBuffers_WriteTo(t *testing.T) {
+	for _, name := range []string{"WriteTo", "Copy"} {
+		for _, size := range []int{0, 10, 1023, 1024, 1025} {
+			t.Run(fmt.Sprintf("%s/%d", name, size), func(t *testing.T) {
+				testBuffer_writeTo(t, size, name == "Copy")
+			})
+		}
+	}
+}
+
+func testBuffer_writeTo(t *testing.T, chunks int, useCopy bool) {
+	var want bytes.Buffer
+	for i := 0; i < chunks; i++ {
+		want.WriteByte(byte(i))
+	}
+
+	var b bytes.Buffer
+	buffers := make(Buffers, chunks)
+	for i := range buffers {
+		buffers[i] = want.Bytes()[i : i+1]
+	}
+	var n int64
+	var err error
+	if useCopy {
+		n, err = io.Copy(&b, &buffers)
+	} else {
+		n, err = buffers.WriteTo(&b)
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(buffers) != 0 {
+		t.Fatal(fmt.Errorf("len(buffers) = %d; want 0", len(buffers)))
+	}
+	if n != int64(want.Len()) {
+		t.Fatal(fmt.Errorf("Buffers.WriteTo returned %d; want %d", n, want.Len()))
+	}
+	all, err := io.ReadAll(&b)
+	if !bytes.Equal(all, want.Bytes()) || err != nil {
+		t.Fatal(fmt.Errorf("read %q, %v; want %q, nil", all, err, want.Bytes()))
+	}
+}