Match temporary IPv6 flags using canonical address bytes

tools/chatgui-android/app/src/test/java/com/utun/chat/data/InterfaceAddressFlagsTest.kt

@@ -0,0 +1,23 @@
+package com.utun.chat.data
+
+import java.net.InetAddress
+import org.junit.Assert.*
+import org.junit.Test
+
+class InterfaceAddressFlagsTest {
+    @Test fun compressedIpv6MustMatchKernelBytesRatherThanPaddingConcatenatedGroups() {
+        val address = InetAddress.getByName("2001:db8::1234").address
+        assertTrue(temporaryIpv6Address("wlan0", address, sequenceOf("20010db8000000000000000000001234 02 40 00 20 wlan0")))
+    }
+    @Test fun anotherInterfaceCannotMarkTheCurrentAddressTemporary() {
+        val address = InetAddress.getByName("2001:db8::1234").address
+        val rows = listOf("20010db8000000000000000000001234 02 40 00 20 mobile0",
+            "20010db8000000000000000000001234 03 40 00 80 wlan0")
+        assertFalse(temporaryIpv6Address("wlan0", address, rows.asSequence()))
+    }
+    @Test fun stableAddressDoesNotInheritFlagsFromAnotherAddressOnTheSameInterface() {
+        val rows = listOf("20010db8000000000000000000001234 02 40 00 20 wlan0",
+            "20010DB8000000000000000000005678 02 40 00 80 wlan0")
+        assertFalse(temporaryIpv6Address("wlan0", InetAddress.getByName("2001:db8::5678").address, rows.asSequence()))
+    }
+}