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68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2018 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package strutil_test
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import (
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. "gopkg.in/check.v1"
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"github.com/snapcore/snapd/strutil"
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)
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type limitedBufferSuite struct{}
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var _ = Suite(&limitedBufferSuite{})
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func (s *limitedBufferSuite) TestLimitedBuffer(c *C) {
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w := strutil.NewLimitedBuffer(100, 6)
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data := []byte{'a'}
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n, err := w.Write(data)
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c.Assert(err, IsNil)
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c.Assert(n, Equals, 1)
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c.Assert(w.Bytes(), DeepEquals, []byte{'a'})
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data = []byte("bcde")
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n, err = w.Write(data)
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c.Assert(err, IsNil)
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c.Assert(n, Equals, 4)
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n, err = w.Write([]byte("xyz"))
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c.Assert(err, IsNil)
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c.Assert(w.Bytes(), DeepEquals, []byte("cdexyz"))
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c.Assert(n, Equals, 3)
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n, err = w.Write([]byte("12"))
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c.Assert(err, IsNil)
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c.Assert(w.Bytes(), DeepEquals, []byte("exyz12"))
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c.Assert(n, Equals, 2)
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// eventually 2 times the size and this triggers the truncate in Write
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n, err = w.Write([]byte("abcd"))
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c.Assert(err, IsNil)
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c.Assert(w.Bytes(), DeepEquals, []byte("12abcd"))
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c.Assert(n, Equals, 4)
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// more than maxBytes in a single write
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n, err = w.Write([]byte("abcdefghijklmnopqrstuvwxyz"))
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c.Assert(err, IsNil)
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c.Assert(w.Bytes(), DeepEquals, []byte("uvwxyz"))
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c.Assert(n, Equals, 26)
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}
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