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test: improve check in test-os #14655

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test: improve check in test-os #14655

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3 changes: 2 additions & 1 deletion test/parallel/test-os.js
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Original file line number Diff line number Diff line change
Expand Up @@ -116,7 +116,8 @@ const interfaces = os.networkInterfaces();
switch (platform) {
case 'linux':
{
const filter = (e) => e.address === '127.0.0.1';
const filter =
(e) => e.address === '127.0.0.1' && e.netmask === '255.0.0.0';
const actual = interfaces.lo.filter(filter);
const expected = [{ address: '127.0.0.1', netmask: '255.0.0.0',
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[warning 🚨 scope-creep]
AFAICT expected and the asserting could be hoisted, and switch replaced with if or trinary for selecting interfaces.lo / interfaces['Loopback Pseudo-Interface 1']

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Some reasons to maybe not do that:

  • If we want to add macOS to the switch statement (in another PR), it will have a different expected value. (The MAC address is different. Yes, the MAC address is different on Mac. Ha ha, ha ha, gosh, I'm funny.)

  • Probably don't want to replace the switch because we need a do-nothing default for macos, smartos... A switch makes sense here, I think. I mean, you can make it work with an if, of course. But I think this more verbose code is actually more readable even though it does violate DRY. (I often don't value DRY much in tests, TBH.)

Even if I'm wrong about that evaluation... must...resist....scope creep.

mac: '00:00:00:00:00:00', family: 'IPv4',
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