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a75360ccd6
This package handles cases where we need to truncate human-readable text to fit a length constraint without leaving "ragged" multi-byte rune fragments at the end of the truncated value. Change-Id: Id972135d1880485f41b1fedfb65c2b8cc012d416 Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>
37 lines
1000 B
Go
37 lines
1000 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package truncate_test
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import (
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"testing"
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"tailscale.com/util/truncate"
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)
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func TestString(t *testing.T) {
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tests := []struct {
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input string
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size int
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want string
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}{
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{"", 1000, ""}, // n > length
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{"abc", 4, "abc"}, // n > length
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{"abc", 3, "abc"}, // n == length
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{"abcdefg", 4, "abcd"}, // n < length, safe
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{"abcdefg", 0, ""}, // n < length, safe
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{"abc\U0001fc2d", 3, "abc"}, // n < length, at boundary
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{"abc\U0001fc2d", 4, "abc"}, // n < length, mid-rune
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{"abc\U0001fc2d", 5, "abc"}, // n < length, mid-rune
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{"abc\U0001fc2d", 6, "abc"}, // n < length, mid-rune
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{"abc\U0001fc2defg", 7, "abc"}, // n < length, cut multibyte
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}
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for _, tc := range tests {
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got := truncate.String(tc.input, tc.size)
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if got != tc.want {
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t.Errorf("truncate(%q, %d): got %q, want %q", tc.input, tc.size, got, tc.want)
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}
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}
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}
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