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// Copyright 2018 Google Inc.
//
// 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 linewriter
import (
"bytes"
"testing"
)
func TestWriter(t *testing.T) {
testCases := []struct {
input []string
want []string
}{
{
input: []string{"1\n", "2\n"},
want: []string{"1", "2"},
},
{
input: []string{"1\n", "\n", "2\n"},
want: []string{"1", "", "2"},
},
{
input: []string{"1\n2\n", "3\n"},
want: []string{"1", "2", "3"},
},
{
input: []string{"1", "2\n"},
want: []string{"12"},
},
{
// Data with no newline yet is omitted.
input: []string{"1\n", "2\n", "3"},
want: []string{"1", "2"},
},
}
for _, c := range testCases {
var lines [][]byte
w := NewWriter(func(p []byte) {
// We must not retain p, so we must make a copy.
b := make([]byte, len(p))
copy(b, p)
lines = append(lines, b)
})
for _, in := range c.input {
n, err := w.Write([]byte(in))
if err != nil {
t.Errorf("Write(%q) err got %v want nil (case %+v)", in, err, c)
}
if n != len(in) {
t.Errorf("Write(%q) b got %d want %d (case %+v)", in, n, len(in), c)
}
}
if len(lines) != len(c.want) {
t.Errorf("len(lines) got %d want %d (case %+v)", len(lines), len(c.want), c)
}
for i := range lines {
if !bytes.Equal(lines[i], []byte(c.want[i])) {
t.Errorf("item %d got %q want %q (case %+v)", i, lines[i], c.want[i], c)
}
}
}
}
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