96 lines
1.7 KiB
Go
96 lines
1.7 KiB
Go
package aghio
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import (
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"io"
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"strings"
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"testing"
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"github.com/AdguardTeam/golibs/testutil"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestLimitReader(t *testing.T) {
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testCases := []struct {
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wantErrMsg string
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name string
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n int64
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}{{
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wantErrMsg: "",
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name: "positive",
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n: 1,
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}, {
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wantErrMsg: "",
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name: "zero",
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n: 0,
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}, {
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wantErrMsg: "aghio: invalid n in LimitReader: -1",
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name: "negative",
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n: -1,
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}}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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_, err := LimitReader(nil, tc.n)
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testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
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})
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}
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}
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func TestLimitedReader_Read(t *testing.T) {
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testCases := []struct {
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err error
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name string
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rStr string
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limit int64
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want int
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}{{
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err: nil,
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name: "perfectly_match",
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rStr: "abc",
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limit: 3,
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want: 3,
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}, {
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err: io.EOF,
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name: "eof",
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rStr: "",
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limit: 3,
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want: 0,
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}, {
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err: &LimitReachedError{
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Limit: 0,
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},
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name: "limit_reached",
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rStr: "abc",
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limit: 0,
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want: 0,
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}, {
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err: nil,
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name: "truncated",
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rStr: "abc",
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limit: 2,
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want: 2,
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}}
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for _, tc := range testCases {
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readCloser := io.NopCloser(strings.NewReader(tc.rStr))
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lreader, err := LimitReader(readCloser, tc.limit)
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require.NoError(t, err)
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require.NotNil(t, lreader)
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t.Run(tc.name, func(t *testing.T) {
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buf := make([]byte, tc.limit+1)
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n, rerr := lreader.Read(buf)
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require.Equal(t, rerr, tc.err)
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assert.Equal(t, tc.want, n)
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})
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}
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}
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func TestLimitedReader_LimitReachedError(t *testing.T) {
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testutil.AssertErrorMsg(t, "attempted to read more than 0 bytes", &LimitReachedError{
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Limit: 0,
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})
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}
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