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|
package pktline
import (
"bytes"
"strings"
"testing"
"github.com/stretchr/testify/require"
)
var (
largestString = strings.Repeat("z", 0xffff-4)
)
func TestScanner(t *testing.T) {
largestPacket := "ffff" + largestString
testCases := []struct {
desc string
in string
out []string
fail bool
}{
{
desc: "happy path",
in: "0010hello world!000000010010hello world!",
out: []string{"0010hello world!", "0000", "0001", "0010hello world!"},
},
{
desc: "large input",
in: "0010hello world!0000" + largestPacket + "0000",
out: []string{"0010hello world!", "0000", largestPacket, "0000"},
},
{
desc: "missing byte middle",
in: "0010hello world!00000010010hello world!",
out: []string{"0010hello world!", "0000", "0010010hello wor"},
fail: true,
},
{
desc: "unfinished prefix",
in: "0010hello world!000",
out: []string{"0010hello world!"},
fail: true,
},
{
desc: "short read in data, only prefix",
in: "0010hello world!0005",
out: []string{"0010hello world!"},
fail: true,
},
}
for _, tc := range testCases {
t.Run(tc.desc, func(t *testing.T) {
scanner := NewScanner(strings.NewReader(tc.in))
var output []string
for scanner.Scan() {
output = append(output, scanner.Text())
}
if tc.fail {
require.Error(t, scanner.Err())
} else {
require.NoError(t, scanner.Err())
}
require.Equal(t, tc.out, output)
})
}
}
func TestData(t *testing.T) {
testCases := []struct {
in string
out string
}{
{in: "0008abcd", out: "abcd"},
{in: "invalid packet", out: "lid packet"},
{in: "0005wrong length prefix", out: "wrong length prefix"},
{in: "0000", out: ""},
}
for _, tc := range testCases {
t.Run(tc.in, func(t *testing.T) {
require.Equal(t, tc.out, string(Data([]byte(tc.in))))
})
}
}
func TestIsFlush(t *testing.T) {
testCases := []struct {
in string
flush bool
}{
{in: "0008abcd", flush: false},
{in: "invalid packet", flush: false},
{in: "0000", flush: true},
{in: "0001", flush: false},
}
for _, tc := range testCases {
t.Run(tc.in, func(t *testing.T) {
require.Equal(t, tc.flush, IsFlush([]byte(tc.in)))
})
}
}
func TestWriteString(t *testing.T) {
testCases := []struct {
desc string
in string
out string
fail bool
}{
{
desc: "empty string",
in: "",
out: "0004",
},
{
desc: "small string",
in: "hello world!",
out: "0010hello world!",
},
{
desc: "largest possible string",
in: largestString,
out: "ffff" + largestString,
},
{
desc: "string that is too large",
in: "x" + largestString,
fail: true,
},
}
for _, tc := range testCases {
t.Run(tc.desc, func(t *testing.T) {
w := &bytes.Buffer{}
n, err := WriteString(w, tc.in)
if tc.fail {
require.Error(t, err)
return
}
require.NoError(t, err)
require.Equal(t, len(tc.in), n, "number of bytes written reported by WriteString")
require.Equal(t, tc.out, w.String())
})
}
}
func TestWriteFlush(t *testing.T) {
w := &bytes.Buffer{}
require.NoError(t, WriteFlush(w))
require.Equal(t, "0000", w.String())
}
|
