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add StringUtils

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This commit is contained in:
Brenton Bostick
2023-01-24 11:50:00 -05:00
parent c6adfd9d67
commit 58e3b8c5ad
3 changed files with 130 additions and 3 deletions
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73
java/test/com/zerotier/sdk/util/StringUtilsTest.java Normal file
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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2023 ZeroTier, Inc. https://www.zerotier.com/
*/
package com.zerotier.sdk.util;
import static com.google.common.truth.Truth.assertThat;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public class StringUtilsTest {
public StringUtilsTest() {
}
public String oldMacDisplay(long mac) {
String macStr = Long.toHexString(mac);
if (macStr.length() > 12) {
throw new RuntimeException();
}
while (macStr.length() < 12) {
//noinspection StringConcatenationInLoop
macStr = "0" + macStr;
}
//noinspection StringBufferReplaceableByString
StringBuilder displayMac = new StringBuilder();
displayMac.append(macStr.charAt(0));
displayMac.append(macStr.charAt(1));
displayMac.append(':');
displayMac.append(macStr.charAt(2));
displayMac.append(macStr.charAt(3));
displayMac.append(':');
displayMac.append(macStr.charAt(4));
displayMac.append(macStr.charAt(5));
displayMac.append(':');
displayMac.append(macStr.charAt(6));
displayMac.append(macStr.charAt(7));
displayMac.append(':');
displayMac.append(macStr.charAt(8));
displayMac.append(macStr.charAt(9));
displayMac.append(':');
displayMac.append(macStr.charAt(10));
displayMac.append(macStr.charAt(11));
return displayMac.toString();
}
@Test
public void testMacDisplay() {
long mac1 = 1234567891;
assertThat(StringUtils.macAddressToString(mac1)).isEqualTo(oldMacDisplay(mac1));
long mac2 = 999999999;
assertThat(StringUtils.macAddressToString(mac2)).isEqualTo(oldMacDisplay(mac2));
long mac3 = 0x7fffffffffffL;
assertThat(StringUtils.macAddressToString(mac3)).isEqualTo(oldMacDisplay(mac3));
assertThat(StringUtils.macAddressToString(mac3)).isEqualTo("7f:ff:ff:ff:ff:ff");
long mac4 = 0x7fafcf3f8fffL;
assertThat(StringUtils.macAddressToString(mac4)).isEqualTo(oldMacDisplay(mac4));
assertThat(StringUtils.macAddressToString(mac4)).isEqualTo("7f:af:cf:3f:8f:ff");
}
}