test: migrate DnsCacheTest to kotest

Author: oldratlee

library/src/test/java/com/alibaba/dcm/DnsCacheTest.java

@@ -0,0 +1,50 @@
+package com.alibaba.dcm
+
+import io.kotest.core.spec.style.AnnotationSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.shouldNotBe
+import java.text.SimpleDateFormat
+import java.util.*
+
+/**
+ * @author Jerry Lee (oldratlee at gmail dot com)
+ */
+class DnsCacheTests : AnnotationSpec() {
+    @Test
+    fun test_equals() {
+        val expiration = System.currentTimeMillis()
+        val entry1 = DnsCacheEntry("a.com", arrayOf("1.1.1.1"), expiration)
+        val entry2 = DnsCacheEntry("b.com", arrayOf("1.1.1.2"), expiration)
+        val entry3 = DnsCacheEntry("c.com", arrayOf("1.1.1.2"), expiration)
+        val entry4 = DnsCacheEntry("d.com", arrayOf("1.1.1.2"), expiration)
+
+        val dnsCache1 = DnsCache(
+                listOf(entry1, entry2),
+                listOf(entry3))
+        val dnsCache2 = DnsCache(
+                listOf(entry1, entry2),
+                listOf(entry4))
+
+        dnsCache1 shouldNotBe dnsCache2
+    }
+
+    @Test
+    fun test_toString() {
+        val expiration = System.currentTimeMillis()
+        val dateFormat = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ")
+        val date = dateFormat.format(Date(expiration))
+
+        val entry1 = DnsCacheEntry("a.com", arrayOf("1.1.1.1"), expiration)
+        val entry2 = DnsCacheEntry("b.com", arrayOf("1.1.1.2"), expiration)
+        val entry3 = DnsCacheEntry("c.com", arrayOf("1.1.1.2"), expiration)
+
+        val dnsCache = DnsCache(
+                listOf(entry1, entry2),
+                listOf(entry3))
+
+        val expected = String.format("DnsCache{cache=[DnsCacheEntry{host='a.com', ips=[1.1.1.1], expiration=%s}" +
+                ", DnsCacheEntry{host='b.com', ips=[1.1.1.2], expiration=%<s}]" +
+                ", negativeCache=[DnsCacheEntry{host='c.com', ips=[1.1.1.2], expiration=%<s}]}", date)
+        dnsCache.toString() shouldBe expected
+    }
+}