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// Copyright 2019 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 iotest
import (
"bytes"
"testing"
)
var truncateWriterTests = []struct {
in string
want string
trunc int64
n int
}{
{"hello", "", -1, 5},
{"world", "", 0, 5},
{"abcde", "abc", 3, 5},
{"edcba", "edcba", 7, 5},
}
func TestTruncateWriter(t *testing.T) {
for _, tt := range truncateWriterTests {
buf := new(bytes.Buffer)
tw := TruncateWriter(buf, tt.trunc)
n, err := tw.Write([]byte(tt.in))
if err != nil {
t.Errorf("Unexpected error %v for\n\t%+v", err, tt)
}
if g, w := buf.String(), tt.want; g != w {
t.Errorf("got %q, expected %q", g, w)
}
if g, w := n, tt.n; g != w {
t.Errorf("read %d bytes, but expected to have read %d bytes for\n\t%+v", g, w, tt)
}
}
}
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