mirror of
https://github.com/golang/go
synced 2024-10-04 18:31:22 -06:00
147 lines
3.7 KiB
Go
147 lines
3.7 KiB
Go
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package io
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import (
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"io";
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"rand";
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"testing";
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)
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const N = 10000; // make this bigger for a larger (and slower) test
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var data []byte; // test data for write tests
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func init() {
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data = make([]byte, N);
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for i := 0; i < len(data); i++ {
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data[i] = 'a' + byte(i % 26)
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}
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}
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// Verify that contents of buf match the string s.
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func check(t *testing.T, testname string, buf *ByteBuffer, s string) {
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if buf.Len() != len(buf.Data()) {
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t.Errorf("%s: buf.Len() == %d, len(buf.Data()) == %d\n", testname, buf.Len(), len(buf.Data()))
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}
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if buf.Len() != len(s) {
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t.Errorf("%s: buf.Len() == %d, len(s) == %d\n", testname, buf.Len(), len(s))
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}
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if string(buf.Data()) != s {
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t.Errorf("%s: string(buf.Data()) == %q, s == %q\n", testname, string(buf.Data()), s)
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}
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}
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// Fill buf through n writes of fub.
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// The initial contents of buf corresponds to the string s;
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// the result is the final contents of buf returned as a string.
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func fill(t *testing.T, testname string, buf *ByteBuffer, s string, n int, fub []byte) string {
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check(t, testname + " (fill 1)", buf, s);
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for ; n > 0; n-- {
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m, err := buf.Write(fub);
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if m != len(fub) {
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t.Errorf(testname + " (fill 2): m == %d, expected %d\n", m, len(fub));
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}
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if err != nil {
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t.Errorf(testname + " (fill 3): err should always be nil, found err == %s\n", err);
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}
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s += string(fub);
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check(t, testname + " (fill 4)", buf, s);
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}
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return s;
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}
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// Empty buf through repeated reads into fub.
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// The initial contents of buf corresponds to the string s.
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func empty(t *testing.T, testname string, buf *ByteBuffer, s string, fub []byte) {
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check(t, testname + " (empty 1)", buf, s);
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for {
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n, err := buf.Read(fub);
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if n == 0 {
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break;
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}
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if err != nil {
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t.Errorf(testname + " (empty 2): err should always be nil, found err == %s\n", err);
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}
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s = s[n : len(s)];
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check(t, testname + " (empty 3)", buf, s);
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}
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check(t, testname + " (empty 4)", buf, "");
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}
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func TestBasicOperations(t *testing.T) {
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var buf ByteBuffer;
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for i := 0; i < 5; i++ {
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check(t, "TestBasicOperations (1)", &buf, "");
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buf.Reset();
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check(t, "TestBasicOperations (2)", &buf, "");
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n, err := buf.Write(data[0 : 1]);
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if n != 1 {
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t.Errorf("wrote 1 byte, but n == %d\n", n);
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}
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if err != nil {
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t.Errorf("err should always be nil, but err == %s\n", err);
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}
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check(t, "TestBasicOperations (3)", &buf, "a");
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n, err = buf.Write(data[1 : 26]);
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if n != 25 {
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t.Errorf("wrote 25 bytes, but n == %d\n", n);
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}
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check(t, "TestBasicOperations (4)", &buf, string(data[0 : 26]));
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empty(t, "TestBasicOperations (5)", &buf, string(data[0 : 26]), make([]byte, 5));
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empty(t, "TestBasicOperations (6)", &buf, "", make([]byte, 100));
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}
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}
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func TestLargeWrites(t *testing.T) {
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var buf ByteBuffer;
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for i := 3; i < 30; i += 3 {
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s := fill(t, "TestLargeWrites (1)", &buf, "", 5, data);
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empty(t, "TestLargeWrites (2)", &buf, s, make([]byte, len(data)/i));
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}
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check(t, "TestLargeWrites (3)", &buf, "");
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}
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func TestLargeReads(t *testing.T) {
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var buf ByteBuffer;
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for i := 3; i < 30; i += 3 {
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s := fill(t, "TestLargeReads (1)", &buf, "", 5, data[0 : len(data)/i]);
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empty(t, "TestLargeReads (2)", &buf, s, make([]byte, len(data)));
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}
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check(t, "TestLargeReads (3)", &buf, "");
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}
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func TestMixedReadsAndWrites(t *testing.T) {
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var buf ByteBuffer;
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s := "";
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for i := 0; i < 50; i++ {
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wlen := rand.Intn(len(data));
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s = fill(t, "TestMixedReadsAndWrites (1)", &buf, s, 1, data[0 : wlen]);
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rlen := rand.Intn(len(data));
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fub := make([]byte, rlen);
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n, err := buf.Read(fub);
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s = s[n : len(s)];
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}
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empty(t, "TestMixedReadsAndWrites (2)", &buf, s, make([]byte, buf.Len()));
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}
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