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PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 81 insertions, 0 deletions

diff --git a/pkg/linewriter/linewriter_test.go b/pkg/linewriter/linewriter_test.go
new file mode 100644
index 000000000..ce97cca05
--- /dev/null
+++ b/pkg/linewriter/linewriter_test.go
@@ -0,0 +1,81 @@
+// 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)
+			}
+		}
+	}
+}