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tailscale/util/truncate/truncate_test.go

37 lines
1000 B
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package truncate_test
import (
"testing"
"tailscale.com/util/truncate"
)
func TestString(t *testing.T) {
tests := []struct {
input string
size int
want string
}{
{"", 1000, ""}, // n > length
{"abc", 4, "abc"}, // n > length
{"abc", 3, "abc"}, // n == length
{"abcdefg", 4, "abcd"}, // n < length, safe
{"abcdefg", 0, ""}, // n < length, safe
{"abc\U0001fc2d", 3, "abc"}, // n < length, at boundary
{"abc\U0001fc2d", 4, "abc"}, // n < length, mid-rune
{"abc\U0001fc2d", 5, "abc"}, // n < length, mid-rune
{"abc\U0001fc2d", 6, "abc"}, // n < length, mid-rune
{"abc\U0001fc2defg", 7, "abc"}, // n < length, cut multibyte
}
for _, tc := range tests {
got := truncate.String(tc.input, tc.size)
if got != tc.want {
t.Errorf("truncate(%q, %d): got %q, want %q", tc.input, tc.size, got, tc.want)
}
}
}