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29 lines
616 B
Go
29 lines
616 B
Go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package tstun
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import (
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"os"
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"testing"
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)
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func TestDefaultMTU(t *testing.T) {
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orig := os.Getenv("TS_DEBUG_MTU")
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defer os.Setenv("TS_DEBUG_MTU", orig)
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os.Setenv("TS_DEBUG_MTU", "")
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if DefaultMTU() != 1280 {
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t.Errorf("DefaultMTU() = %d, want 1280", DefaultMTU())
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}
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os.Setenv("TS_DEBUG_MTU", "9000")
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if DefaultMTU() != 9000 {
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t.Errorf("DefaultMTU() = %d, want 9000", DefaultMTU())
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}
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os.Setenv("TS_DEBUG_MTU", "123456789")
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if DefaultMTU() != maxMTU {
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t.Errorf("DefaultMTU() = %d, want %d", DefaultMTU(), maxMTU)
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}
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}
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