Checking in vendor folder for ease of using go get.

vendor/golang.org/x/text/encoding/internal/enctest/enctest.go

@@ -0,0 +1,180 @@
+// Copyright 2017 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 enctest
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"strings"
+	"testing"
+
+	"golang.org/x/text/encoding"
+	"golang.org/x/text/encoding/internal/identifier"
+	"golang.org/x/text/transform"
+)
+
+// Encoder or Decoder
+type Transcoder interface {
+	transform.Transformer
+	Bytes([]byte) ([]byte, error)
+	String(string) (string, error)
+}
+
+func TestEncoding(t *testing.T, e encoding.Encoding, encoded, utf8, prefix, suffix string) {
+	for _, direction := range []string{"Decode", "Encode"} {
+		t.Run(fmt.Sprintf("%v/%s", e, direction), func(t *testing.T) {
+
+			var coder Transcoder
+			var want, src, wPrefix, sPrefix, wSuffix, sSuffix string
+			if direction == "Decode" {
+				coder, want, src = e.NewDecoder(), utf8, encoded
+				wPrefix, sPrefix, wSuffix, sSuffix = "", prefix, "", suffix
+			} else {
+				coder, want, src = e.NewEncoder(), encoded, utf8
+				wPrefix, sPrefix, wSuffix, sSuffix = prefix, "", suffix, ""
+			}
+
+			dst := make([]byte, len(wPrefix)+len(want)+len(wSuffix))
+			nDst, nSrc, err := coder.Transform(dst, []byte(sPrefix+src+sSuffix), true)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if nDst != len(wPrefix)+len(want)+len(wSuffix) {
+				t.Fatalf("nDst got %d, want %d",
+					nDst, len(wPrefix)+len(want)+len(wSuffix))
+			}
+			if nSrc != len(sPrefix)+len(src)+len(sSuffix) {
+				t.Fatalf("nSrc got %d, want %d",
+					nSrc, len(sPrefix)+len(src)+len(sSuffix))
+			}
+			if got := string(dst); got != wPrefix+want+wSuffix {
+				t.Fatalf("\ngot  %q\nwant %q", got, wPrefix+want+wSuffix)
+			}
+
+			for _, n := range []int{0, 1, 2, 10, 123, 4567} {
+				input := sPrefix + strings.Repeat(src, n) + sSuffix
+				g, err := coder.String(input)
+				if err != nil {
+					t.Fatalf("Bytes: n=%d: %v", n, err)
+				}
+				if len(g) == 0 && len(input) == 0 {
+					// If the input is empty then the output can be empty,
+					// regardless of whatever wPrefix is.
+					continue
+				}
+				got1, want1 := string(g), wPrefix+strings.Repeat(want, n)+wSuffix
+				if got1 != want1 {
+					t.Fatalf("ReadAll: n=%d\ngot  %q\nwant %q",
+						n, trim(got1), trim(want1))
+				}
+			}
+		})
+	}
+}
+
+func TestFile(t *testing.T, e encoding.Encoding) {
+	for _, dir := range []string{"Decode", "Encode"} {
+		t.Run(fmt.Sprintf("%s/%s", e, dir), func(t *testing.T) {
+			dst, src, transformer, err := load(dir, e)
+			if err != nil {
+				t.Fatalf("load: %v", err)
+			}
+			buf, err := transformer.Bytes(src)
+			if err != nil {
+				t.Fatalf("transform: %v", err)
+			}
+			if !bytes.Equal(buf, dst) {
+				t.Error("transformed bytes did not match golden file")
+			}
+		})
+	}
+}
+
+func Benchmark(b *testing.B, enc encoding.Encoding) {
+	for _, direction := range []string{"Decode", "Encode"} {
+		b.Run(fmt.Sprintf("%s/%s", enc, direction), func(b *testing.B) {
+			_, src, transformer, err := load(direction, enc)
+			if err != nil {
+				b.Fatal(err)
+			}
+			b.SetBytes(int64(len(src)))
+			b.ResetTimer()
+			for i := 0; i < b.N; i++ {
+				r := transform.NewReader(bytes.NewReader(src), transformer)
+				io.Copy(ioutil.Discard, r)
+			}
+		})
+	}
+}
+
+// testdataFiles are files in testdata/*.txt.
+var testdataFiles = []struct {
+	mib           identifier.MIB
+	basename, ext string
+}{
+	{identifier.Windows1252, "candide", "windows-1252"},
+	{identifier.EUCPkdFmtJapanese, "rashomon", "euc-jp"},
+	{identifier.ISO2022JP, "rashomon", "iso-2022-jp"},
+	{identifier.ShiftJIS, "rashomon", "shift-jis"},
+	{identifier.EUCKR, "unsu-joh-eun-nal", "euc-kr"},
+	{identifier.GBK, "sunzi-bingfa-simplified", "gbk"},
+	{identifier.HZGB2312, "sunzi-bingfa-gb-levels-1-and-2", "hz-gb2312"},
+	{identifier.Big5, "sunzi-bingfa-traditional", "big5"},
+	{identifier.UTF16LE, "candide", "utf-16le"},
+	{identifier.UTF8, "candide", "utf-8"},
+	{identifier.UTF32BE, "candide", "utf-32be"},
+
+	// GB18030 is a superset of GBK and is nominally a Simplified Chinese
+	// encoding, but it can also represent the entire Basic Multilingual
+	// Plane, including codepoints like 'â' that aren't encodable by GBK.
+	// GB18030 on Simplified Chinese should perform similarly to GBK on
+	// Simplified Chinese. GB18030 on "candide" is more interesting.
+	{identifier.GB18030, "candide", "gb18030"},
+}
+
+func load(direction string, enc encoding.Encoding) ([]byte, []byte, Transcoder, error) {
+	basename, ext, count := "", "", 0
+	for _, tf := range testdataFiles {
+		if mib, _ := enc.(identifier.Interface).ID(); tf.mib == mib {
+			basename, ext = tf.basename, tf.ext
+			count++
+		}
+	}
+	if count != 1 {
+		if count == 0 {
+			return nil, nil, nil, fmt.Errorf("no testdataFiles for %s", enc)
+		}
+		return nil, nil, nil, fmt.Errorf("too many testdataFiles for %s", enc)
+	}
+	dstFile := fmt.Sprintf("../testdata/%s-%s.txt", basename, ext)
+	srcFile := fmt.Sprintf("../testdata/%s-utf-8.txt", basename)
+	var coder Transcoder = encoding.ReplaceUnsupported(enc.NewEncoder())
+	if direction == "Decode" {
+		dstFile, srcFile = srcFile, dstFile
+		coder = enc.NewDecoder()
+	}
+	dst, err := ioutil.ReadFile(dstFile)
+	if err != nil {
+		if dst, err = ioutil.ReadFile("../" + dstFile); err != nil {
+			return nil, nil, nil, err
+		}
+	}
+	src, err := ioutil.ReadFile(srcFile)
+	if err != nil {
+		if src, err = ioutil.ReadFile("../" + srcFile); err != nil {
+			return nil, nil, nil, err
+		}
+	}
+	return dst, src, coder, nil
+}
+
+func trim(s string) string {
+	if len(s) < 120 {
+		return s
+	}
+	return s[:50] + "..." + s[len(s)-50:]
+}