added an icmp test

knet/src/test/kotlin/com/jasonernst/knet/icmp/ICMPTest.kt

@@ -0,0 +1,25 @@
+package com.jasonernst.knet.icmp
+
+import com.jasonernst.icmp_common.ICMPHeader
+import com.jasonernst.icmp_common.v4.ICMPv4EchoPacket
+import com.jasonernst.icmp_common.v6.ICMPv6EchoPacket
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import java.nio.ByteBuffer
+
+class ICMPTest {
+    @Test
+    fun icmpv4() {
+        val icmp = ICMPv4EchoPacket(id = 1u, sequence = 2u, data = "hello".toByteArray())
+        val stream = ByteBuffer.wrap(icmp.toByteArray())
+        val parsed = ICMPHeader.fromStream(stream)
+        assertEquals(icmp, parsed)
+    }
+
+    @Test fun icmpv6() {
+        val icmp = ICMPv6EchoPacket(id = 1u, sequence = 2u, data = "hello".toByteArray())
+        val stream = ByteBuffer.wrap(icmp.toByteArray())
+        val parsed = ICMPHeader.fromStream(stream, isIcmpV4 = false)
+        assertEquals(icmp, parsed)
+    }
+}