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api_test.go
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api_test.go
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package permissivecsv_test
import (
"errors"
"io"
"strings"
"testing"
"github.com/eltorocorp/permissivecsv"
"github.com/go-test/deep"
"github.com/stretchr/testify/assert"
)
var ErrReader = errors.New("arbitrary reader error")
// BadReader returns ErrReader on the first Read call.
func BadReader(r io.ReadSeeker) io.Reader { return &badReader{r} }
type badReader struct {
r io.ReadSeeker
}
func (r *badReader) Read(p []byte) (int, error) {
return 0, ErrReader
}
func Test_Reader(t *testing.T) {
tests := []struct {
name string
reader io.Reader
expScans int
expCurrentRecord []string
}{
{
name: "reader is nil",
reader: nil,
expScans: 0,
expCurrentRecord: nil,
},
{
name: "reader is not nil",
reader: strings.NewReader(""),
expScans: 0,
expCurrentRecord: []string{},
},
{
// If a reader reports an error, the scanner will stop after the
// current record. If possible, whichever value is loaded as the
// current record in the underlaying io.Scanner is returned, but
// this is typically an empty string. Since no more reads are
// possible, permissivecsv considers this the end of the file.
name: "reader returns an error",
reader: BadReader(strings.NewReader("a\nb\nc")),
expScans: 0,
expCurrentRecord: []string{},
},
}
for _, test := range tests {
testFn := func(t *testing.T) {
s := permissivecsv.NewScanner(test.reader, permissivecsv.HeaderCheckAssumeNoHeader)
n := 0
for s.Scan() {
n++
}
currentRecord := s.CurrentRecord()
assert.Equal(t, test.expScans, n, "expected scans is incorrect")
assert.ElementsMatch(t, test.expCurrentRecord, currentRecord, "current record is incorrect")
}
t.Run(test.name, testFn)
}
}
func Test_ScanAndCurrentRecord(t *testing.T) {
tests := []struct {
name string
input string
result [][]string
}{
{
name: "single empty record",
input: "",
result: [][]string{},
},
{
name: "single record",
input: "1,2,3",
result: [][]string{[]string{"1", "2", "3"}},
},
{
// permissivecsv accepts standard unix record terminators
name: "unix terminators",
input: "a,a,a\nb,b,b\nc,c,c",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"b", "b", "b"},
[]string{"c", "c", "c"},
},
},
{
// permissivecsv accepts standard DOS record terminators
name: "DOS terminators",
input: "a,a,a\r\nb,b,b\r\nc,c,c",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"b", "b", "b"},
[]string{"c", "c", "c"},
},
},
{
// permissivecsv accepts non-standard carriage return terminators
name: "carriage return as terminator",
input: "a,a,a\rb,b,b\rc,c,c",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"b", "b", "b"},
[]string{"c", "c", "c"},
},
},
{
// permissivecsv accepts non-standard "inverted DOS" terminators
name: "inverted DOS terminator",
input: "a,a,a\n\rb,b,b\n\rc,c,c",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"b", "b", "b"},
[]string{"c", "c", "c"},
},
},
{
name: "dangling terminators",
input: "a,a,a\nb,b,b\nc,c,c\n\n\n\n",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"b", "b", "b"},
[]string{"c", "c", "c"},
},
},
{
name: "leading terminators",
input: "\r\n\r\n\r\n\r\n\r\n\r\na,a,a\r\nb,b,b\r\nc,c,c",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"b", "b", "b"},
[]string{"c", "c", "c"},
},
},
{
name: "empty records",
input: "a,a,a\nb,b,b\n\n\n\n\nc,c,c",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"b", "b", "b"},
[]string{"c", "c", "c"},
},
},
{
// if the first thing permissivecsv encounters is an empty field
// followed by a terminator, it assumes that to be correct. All
// subsequent records are expected to also only have one field, and
// are truncated as necessary.
name: "loitering empty field",
input: "\"\"\na,a,a\nb,b,b\nc,c,c",
result: [][]string{
[]string{""},
[]string{"a"},
[]string{"b"},
[]string{"c"},
},
},
{
// permissivecsv doesn't care about mixing terminators.
name: "mixed terminators",
input: "a,a\nb,b\nc,c\r\nd,d\ne,e\n\rf,f",
result: [][]string{
[]string{"a", "a"},
[]string{"b", "b"},
[]string{"c", "c"},
[]string{"d", "d"},
[]string{"e", "e"},
[]string{"f", "f"},
},
},
{
// permissivecsv ignores terminators that are quoted
name: "ignore quoted",
input: "a,a,a\n\"\n\",b,b\nc,c,c",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"\n", "b", "b"},
[]string{"c", "c", "c"},
},
},
{
// permissivecsv will nullify the values for all of a record's
// fields if it encounters a bare quote. This is the most
// consistent way to represent data that has been corrupted in this
// manner. permissivecsv's handling of bare quotes differs from
// the stdlib's csv.Reader. csv.Reader will concatenate all of a
// record's data into a single field if it encounters an unpaired
// quote. This results in a variation of data output per record that
// encounters this issue. permissivecsv instead blanks the data
// for the bad record, and reports the issue via Summary.
// This reduces the number of data variants output by the Scanner,
// while allowing the caller to still handle issues as they see fit.
name: "bare quotes",
input: "a,a,a\n\"b\"b,b,b\nc,c,c",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"", "", ""},
[]string{"c", "c", "c"},
},
},
{
// permissivecsv handles extraneous quotes the same way that it
// handles bare quotes, by nullifying the field values of the
// affected record.
name: "extraneous quote",
input: "a,a,a\nb\"\"b,b,b\nc,c,c",
result: [][]string{
[]string{"a", "a", "a"},
[]string{"", "", ""},
[]string{"c", "c", "c"},
},
},
}
for _, test := range tests {
testFn := func(t *testing.T) {
r := strings.NewReader(test.input)
s := permissivecsv.NewScanner(r, permissivecsv.HeaderCheckAssumeNoHeader)
result := [][]string{}
for s.Scan() {
result = append(result, s.CurrentRecord())
}
assert.Equal(t, test.result, result)
}
t.Run(test.name, testFn)
}
}
func Test_Summary(t *testing.T) {
tests := []struct {
name string
data io.ReadSeeker
// scanLimit caps the number of times the test fixture will
// call Scan. -1 will call Scan until it returns false.
scanLimit int
expSummary *permissivecsv.ScanSummary
}{
{
name: "summary nil before Scan called",
data: strings.NewReader("a,b,c"),
scanLimit: 0,
expSummary: nil,
},
{
name: "nil reader",
data: nil,
scanLimit: -1,
expSummary: &permissivecsv.ScanSummary{
RecordCount: -1,
AlterationCount: -1,
EOF: false,
Err: permissivecsv.ErrReaderIsNil,
Alterations: []*permissivecsv.Alteration{},
},
},
{
name: "extraneous quotes",
data: strings.NewReader("\""),
scanLimit: -1,
expSummary: &permissivecsv.ScanSummary{
RecordCount: 1,
AlterationCount: 1,
EOF: true,
Err: nil,
Alterations: []*permissivecsv.Alteration{
&permissivecsv.Alteration{
RecordOrdinal: 1,
OriginalData: "\"",
ResultingRecord: []string{},
AlterationDescription: permissivecsv.AltExtraneousQuote,
},
},
},
},
{
name: "bare quote",
data: strings.NewReader("a\nb\""),
scanLimit: -1,
expSummary: &permissivecsv.ScanSummary{
RecordCount: 2,
AlterationCount: 1,
EOF: true,
Err: nil,
Alterations: []*permissivecsv.Alteration{
&permissivecsv.Alteration{
RecordOrdinal: 2,
OriginalData: "b\"",
ResultingRecord: []string{""},
AlterationDescription: permissivecsv.AltBareQuote,
},
},
},
},
{
name: "truncated record",
data: strings.NewReader("a,b,c\nd,e,f,g"),
scanLimit: -1,
expSummary: &permissivecsv.ScanSummary{
RecordCount: 2,
AlterationCount: 1,
EOF: true,
Err: nil,
Alterations: []*permissivecsv.Alteration{
&permissivecsv.Alteration{
RecordOrdinal: 2,
OriginalData: "d,e,f,g",
ResultingRecord: []string{"d", "e", "f"},
AlterationDescription: permissivecsv.AltTruncatedRecord,
},
},
},
},
{
name: "padded record",
data: strings.NewReader("a,b,c\nd,e"),
scanLimit: -1,
expSummary: &permissivecsv.ScanSummary{
RecordCount: 2,
AlterationCount: 1,
EOF: true,
Err: nil,
Alterations: []*permissivecsv.Alteration{
&permissivecsv.Alteration{
RecordOrdinal: 2,
OriginalData: "d,e",
ResultingRecord: []string{"d", "e", ""},
AlterationDescription: permissivecsv.AltPaddedRecord,
},
},
},
},
{
name: "EOF false before end of file",
data: strings.NewReader("a\n\b\nc"),
scanLimit: 1,
expSummary: &permissivecsv.ScanSummary{
RecordCount: 1,
AlterationCount: 0,
EOF: false,
Err: nil,
Alterations: []*permissivecsv.Alteration{},
},
},
}
for _, test := range tests {
testFn := func(t *testing.T) {
s := permissivecsv.NewScanner(test.data, permissivecsv.HeaderCheckAssumeNoHeader)
for n := 0; ; n++ {
if test.scanLimit >= 0 && n >= test.scanLimit {
break
}
more := s.Scan()
if !more {
break
}
}
summary := s.Summary()
if test.expSummary == nil {
assert.Nil(t, summary)
} else {
diff := deep.Equal(summary, test.expSummary)
if diff != nil {
t.Error(diff)
}
}
}
t.Run(test.name, testFn)
}
}
func Test_HeaderCheckCallback(t *testing.T) {
tests := []struct {
name string
data string
scanLimit int
expFirstRecord []string
expSecondRecord []string
}{
{
name: "nils before Scan",
data: "a,b,c\nd,e,f\ng,h,i",
scanLimit: 0,
expFirstRecord: nil,
},
{
name: "1st correct on first Scan",
data: "a,b,c\nd,e,f\ng,h,i",
scanLimit: 1,
expFirstRecord: []string{"a", "b", "c"},
},
{
name: "scan advanced beyond first record",
data: "a,b,c\nd,e,f\ng,h,i",
scanLimit: -1,
expFirstRecord: nil,
},
}
for _, test := range tests {
testFn := func(t *testing.T) {
var actualFirstRecord []string
headerCheck := func(firstRecord []string) bool {
actualFirstRecord = firstRecord
return false
}
r := strings.NewReader(test.data)
s := permissivecsv.NewScanner(r, headerCheck)
for n := 0; ; n++ {
if test.scanLimit >= 0 && n >= test.scanLimit {
break
}
more := s.Scan()
// actual result of RecordIsHeader isn't pertinant to these test
// cases
_ = s.RecordIsHeader()
if !more {
break
}
}
if test.expFirstRecord == nil {
assert.Nil(t, actualFirstRecord, "expected first record to be nil")
} else {
assert.Equal(t, test.expFirstRecord, actualFirstRecord)
}
}
t.Run(test.name, testFn)
}
}
func Test_Partition(t *testing.T) {
// The partition tests specifically target segment generation capabilities,
// and presume that the underlaying record splitter is properly identifying
// terminators and returning raw records to Split as intended.
tests := []struct {
name string
data io.ReadSeeker
recordsPerPartition int
excludeHeader bool
expPartitions []*permissivecsv.Segment
}{
{
name: "nil reader",
data: nil,
recordsPerPartition: 10,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{},
},
{
name: "empty file",
data: strings.NewReader(""),
recordsPerPartition: 10,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{},
},
{
name: "one byte long terminator",
data: strings.NewReader("a,b\nc,d\ne,f\ng,h\ni,j\nk,l"),
recordsPerPartition: 2,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 0,
Length: 8,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 8,
Length: 8,
},
&permissivecsv.Segment{
Ordinal: 3,
LowerOffset: 16,
Length: 7,
},
},
},
{
name: "two byte long terminator",
data: strings.NewReader("a,b\r\nc,d\r\ne,f\r\ng,h\r\ni,j\r\nk,l"),
recordsPerPartition: 2,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 0,
Length: 10,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 10,
Length: 10,
},
&permissivecsv.Segment{
Ordinal: 3,
LowerOffset: 20,
Length: 8,
},
},
},
{
name: "one byte term with partial final segment",
data: strings.NewReader("a,b\nc,d\ne,f\ng,h\ni,j\nk,l\nm,n"),
recordsPerPartition: 2,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 0,
Length: 8,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 8,
Length: 8,
},
&permissivecsv.Segment{
Ordinal: 3,
LowerOffset: 16,
Length: 8,
},
&permissivecsv.Segment{
Ordinal: 4,
LowerOffset: 24,
Length: 3,
},
},
},
{
name: "two byte term with partial final segment",
data: strings.NewReader("a,b\r\nc,d\r\ne,f\r\ng,h\r\ni,j\r\nk,l\r\nm,n"),
recordsPerPartition: 2,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 0,
Length: 10,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 10,
Length: 10,
},
&permissivecsv.Segment{
Ordinal: 3,
LowerOffset: 20,
Length: 10,
},
&permissivecsv.Segment{
Ordinal: 4,
LowerOffset: 30,
Length: 3,
},
},
},
{
name: "mixed terminators",
data: strings.NewReader("a,b\r\nc,d\ne,f\ng,h\ni,j\nk,l\nm,n"),
recordsPerPartition: 2,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 0,
Length: 9,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 9,
Length: 8,
},
&permissivecsv.Segment{
Ordinal: 3,
LowerOffset: 17,
Length: 8,
},
&permissivecsv.Segment{
Ordinal: 4,
LowerOffset: 25,
Length: 3,
},
},
},
{
name: "variable record lengths",
data: strings.NewReader("a,b,c\ndd\nee,ff,gg,h\ni,j"),
recordsPerPartition: 2,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 0,
Length: 9,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 9,
Length: 14,
},
},
},
{
name: "one byte term ignore header",
data: strings.NewReader("a,b\nc,d\ne,f\ng,h\ni,j\nk,l\nm,n"),
recordsPerPartition: 2,
excludeHeader: true,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 4,
Length: 8,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 12,
Length: 8,
},
&permissivecsv.Segment{
Ordinal: 3,
LowerOffset: 20,
Length: 7,
},
},
},
{
name: "two byte term ignore header",
data: strings.NewReader("a,b\n\rc,d\n\re,f\n\rg,h\n\ri,j\n\rk,l\n\rm,n"),
recordsPerPartition: 2,
excludeHeader: true,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 5,
Length: 10,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 15,
Length: 10,
},
&permissivecsv.Segment{
Ordinal: 3,
LowerOffset: 25,
Length: 8,
},
},
},
{
name: "leading terminators",
data: strings.NewReader("\n\n\na\nb\nc\nd"),
recordsPerPartition: 2,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 0,
Length: 7,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 7,
Length: 3,
},
},
},
{
name: "dangling terminators",
data: strings.NewReader("a\nb\n\n\n"),
recordsPerPartition: 2,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 0,
Length: 6,
},
},
},
{
name: "empty records",
data: strings.NewReader("a\nb\n\n\nc"),
recordsPerPartition: 2,
excludeHeader: false,
expPartitions: []*permissivecsv.Segment{
&permissivecsv.Segment{
Ordinal: 1,
LowerOffset: 0,
Length: 6,
},
&permissivecsv.Segment{
Ordinal: 2,
LowerOffset: 6,
Length: 1,
},
},
},
}
for _, test := range tests {
testFn := func(t *testing.T) {
s := permissivecsv.NewScanner(test.data, permissivecsv.HeaderCheckAssumeHeaderExists)
partitions := s.Partition(test.recordsPerPartition, test.excludeHeader)
diff := deep.Equal(test.expPartitions, partitions)
if diff != nil {
for _, d := range diff {
t.Log(d)
}
t.Fail()
}
}
t.Run(test.name, testFn)
}
}