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// Copyright 2017, Joe Tsai. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
package memfile
import (
"io"
"io/ioutil"
"os"
"strings"
"testing"
)
func TestFile(t *testing.T) {
type (
testRead struct {
cnt int
wantData string
wantErr error
}
testReadAt struct {
cnt int
pos int64
wantData string
wantErr error
}
testWrite struct {
data string
wantCnt int
wantErr error
}
testWriteAt struct {
data string
pos int64
wantCnt int
wantErr error
}
testSeek struct {
offset int64
whence int
wantPos int64
wantErr error
}
testTruncate struct {
size int64
wantErr error
}
testBytes struct {
wantData string
}
)
sz := func(n int) string { return strings.Repeat("\x00", n) }
tests := []interface{}{ // []T where T is one of the testX types above
testRead{10, "", io.EOF},
testSeek{5, io.SeekEnd, 5, nil},
testSeek{5, io.SeekEnd, 5, nil},
testWrite{"abcdefghijklmnopqrstuvwxyz", 26, nil},
testTruncate{25, nil},
testBytes{sz(5) + "abcdefghijklmnopqrst"},
testTruncate{-1, errInvalid},
testTruncate{10, nil},
testWriteAt{"ABCDE", 15, 5, nil},
testBytes{sz(5) + "abcde" + sz(5) + "ABCDE"},
testReadAt{10, 15, "ABCDE", io.EOF},
testReadAt{10, -15, "", errInvalid},
testWriteAt{"ABCDE", -15, 0, errInvalid},
testReadAt{8, 3, sz(2) + "abcde" + sz(1), nil},
testSeek{0, io.SeekCurrent, 31, nil},
testSeek{-32, io.SeekCurrent, 0, errInvalid},
testSeek{-11, io.SeekCurrent, 20, nil},
testWrite{"#", 1, nil},
testBytes{sz(5) + "abcde" + sz(5) + "ABCDE#"},
testTruncate{0, nil},
testWrite{"#", 1, nil},
testBytes{sz(21) + "#"},
testSeek{5, io.SeekStart, 5, nil},
testWrite{"12345", 5, nil},
testSeek{5, io.SeekStart, 5, nil},
testRead{5, "12345", nil},
testSeek{-23, io.SeekEnd, 0, errInvalid},
testSeek{0, io.SeekEnd, 22, nil},
testSeek{-22, io.SeekEnd, 0, nil},
testRead{10, sz(5) + "12345", nil},
testSeek{0, io.SeekCurrent, 10, nil},
testTruncate{0, nil},
testBytes{""},
}
// Create a new File that emulates a file's operations.
fb := new(File)
// Open a temporary file to match behavior with.
ft, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer ft.Close()
defer os.Remove(ft.Name())
for i, tt := range tests {
switch tt := tt.(type) {
case testRead:
b := make([]byte, tt.cnt)
n, gotErr := readFull(fb, b)
gotData := string(b[:n])
if gotData != tt.wantData || gotErr != tt.wantErr {
t.Fatalf("test %d, Read():\ngot (%q, %v)\nwant (%q, %v)", i, gotData, gotErr, tt.wantData, tt.wantErr)
}
n, wantErr := readFull(ft, b)
wantData := string(b[:n])
if gotData != wantData || (gotErr == nil) != (wantErr == nil) {
t.Fatalf("test %d, Read():\ngot (%q, %v)\nwant (%q, %v)", i, gotData, gotErr, wantData, wantErr)
}
case testReadAt:
b := make([]byte, tt.cnt)
n, gotErr := fb.ReadAt(b, tt.pos)
gotData := string(b[:n])
if gotData != tt.wantData || gotErr != tt.wantErr {
t.Fatalf("test %d, ReadAt():\ngot (%q, %v)\nwant (%q, %v)", i, gotData, gotErr, tt.wantData, tt.wantErr)
}
n, wantErr := ft.ReadAt(b, tt.pos)
wantData := string(b[:n])
if gotData != wantData || (gotErr == nil) != (wantErr == nil) {
t.Fatalf("test %d, ReadAt():\ngot (%q, %v)\nwant (%q, %v)", i, gotData, gotErr, wantData, wantErr)
}
case testWrite:
gotCnt, gotErr := fb.Write([]byte(tt.data))
if gotCnt != tt.wantCnt || gotErr != tt.wantErr {
t.Fatalf("test %d, Write():\ngot (%d, %v)\nwant (%d, %v)", i, gotCnt, gotErr, tt.wantCnt, tt.wantErr)
}
wantCnt, wantErr := ft.Write([]byte(tt.data))
if gotCnt != wantCnt || (gotErr == nil) != (wantErr == nil) {
t.Fatalf("test %d, Write():\ngot (%d, %v)\nwant (%d, %v)", i, gotCnt, gotErr, wantCnt, wantErr)
}
case testWriteAt:
gotCnt, gotErr := fb.WriteAt([]byte(tt.data), tt.pos)
if gotCnt != tt.wantCnt || gotErr != tt.wantErr {
t.Fatalf("test %d, WriteAt():\ngot (%d, %v)\nwant (%d, %v)", i, gotCnt, gotErr, tt.wantCnt, tt.wantErr)
}
wantCnt, wantErr := ft.WriteAt([]byte(tt.data), tt.pos)
if gotCnt != wantCnt || (gotErr == nil) != (wantErr == nil) {
t.Fatalf("test %d, WriteAt():\ngot (%d, %v)\nwant (%d, %v)", i, gotCnt, gotErr, wantCnt, wantErr)
}
case testSeek:
gotPos, gotErr := fb.Seek(tt.offset, tt.whence)
if gotPos != tt.wantPos || gotErr != tt.wantErr {
t.Fatalf("test %d, Seek():\ngot (%d, %v)\nwant (%d, %v)", i, gotPos, gotErr, tt.wantPos, tt.wantErr)
}
wantPos, wantErr := ft.Seek(tt.offset, tt.whence)
if gotPos != wantPos || (gotErr == nil) != (wantErr == nil) {
t.Fatalf("test %d, Seek():\ngot (%d, %v)\nwant (%d, %v)", i, gotPos, gotErr, wantPos, wantErr)
}
case testTruncate:
gotErr := fb.Truncate(tt.size)
if gotErr != tt.wantErr {
t.Fatalf("test %d, Truncate() = %v, want %v", i, gotErr, tt.wantErr)
}
wantErr := ft.Truncate(tt.size)
if (gotErr == nil) != (wantErr == nil) {
t.Fatalf("test %d, Truncate() = %v, want %v", i, gotErr, wantErr)
}
case testBytes:
gotData := string(fb.Bytes())
if gotData != tt.wantData {
t.Fatalf("test %d, Bytes():\ngot %q\nwant %q", i, gotData, tt.wantData)
}
wantData, err := ioutil.ReadFile(ft.Name())
if err != nil {
t.Fatalf("test %d, unexpected ReadFile error: %v", i, err)
}
if gotData != string(wantData) {
t.Fatalf("test %d, Bytes():\ngot %q\nwant %q", i, gotData, wantData)
}
default:
t.Fatalf("test %d, unknown test operation: %T", i, tt)
}
}
}
func readFull(r io.Reader, b []byte) (n int, err error) {
b0 := b
for len(b) > 0 && err == nil {
n, err = r.Read(b)
b = b[n:]
}
if len(b) == 0 && err == io.EOF {
err = nil
}
return len(b0) - len(b), err
}
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