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// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package eventsource

import (
	"bytes"
	"testing"
)

func Test_wrapNewlines(t *testing.T) {
	tests := []struct {
		name   string
		prefix string
		value  string
		output string
	}{
		{
			"check no new lines",
			"prefix: ",
			"value",
			"prefix: value\n",
		},
		{
			"check simple newline",
			"prefix: ",
			"value1\nvalue2",
			"prefix: value1\nprefix: value2\n",
		},
		{
			"check pathological newlines",
			"p: ",
			"\n1\n\n2\n3\n",
			"p: \np: 1\np: \np: 2\np: 3\np: \n",
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := &bytes.Buffer{}
			gotSum, err := wrapNewlines(w, []byte(tt.prefix), []byte(tt.value))
			if err != nil {
				t.Errorf("wrapNewlines() error = %v", err)
				return
			}
			if gotSum != int64(len(tt.output)) {
				t.Errorf("wrapNewlines() = %v, want %v", gotSum, int64(len(tt.output)))
			}
			if gotW := w.String(); gotW != tt.output {
				t.Errorf("wrapNewlines() = %v, want %v", gotW, tt.output)
			}
		})
	}
}