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// Copyright The Notary Project Authors.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package io
import (
"bytes"
"errors"
"testing"
)
func TestLimitWriter(t *testing.T) {
limit := int64(10)
tests := []struct {
input string
expected string
written int
}{
{"hello", "hello", 5},
{" world", " world", 6},
{"!", "!", 1},
{"1234567891011", "1234567891", 10},
}
for _, tt := range tests {
var buf bytes.Buffer
lw := LimitWriter(&buf, limit)
n, err := lw.Write([]byte(tt.input))
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if n != tt.written {
t.Errorf("expected %d bytes written, got %d", tt.written, n)
}
if buf.String() != tt.expected {
t.Errorf("expected buffer %q, got %q", tt.expected, buf.String())
}
}
}
func TestLimitWriterFailed(t *testing.T) {
limit := int64(10)
longString := "1234567891011"
var buf bytes.Buffer
lw := LimitWriter(&buf, limit)
_, err := lw.Write([]byte(longString))
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
_, err = lw.Write([]byte(longString))
expectedErr := errors.New("write limit exceeded")
if err.Error() != expectedErr.Error() {
t.Errorf("expected error %v, got %v", expectedErr, err)
}
}
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