Add HostLoader test

test/HostLoaderTest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Amp\Dns\Test;
+
+use Amp\Dns\HostLoader;
+use Amp\Dns\Record;
+use Amp\Loop;
+use Amp\PHPUnit\TestCase;
+
+class HostLoaderTest extends TestCase {
+    public function testIgnoresCommentsAndParsesBasicEntry() {
+        Loop::run(function () {
+            $loader = new HostLoader(__DIR__ . "/data/hosts");
+            $this->assertSame([
+                Record::A => [
+                    "localhost" => "127.0.0.1",
+                ],
+            ], yield $loader->loadHosts());
+        });
+    }
+
+    public function testReturnsEmptyErrorOnFileNotFound() {
+        Loop::run(function () {
+            $loader = new HostLoader(__DIR__ . "/data/hosts.not.found");
+            $this->assertSame([], yield $loader->loadHosts());
+        });
+    }
+
+    public function testIgnoresInvalidNames() {
+        Loop::run(function () {
+            $loader = new HostLoader(__DIR__ . "/data/hosts.invalid.name");
+            $this->assertSame([
+                Record::A => [
+                    "localhost" => "127.0.0.1",
+                ],
+            ], yield $loader->loadHosts());
+        });
+    }
+}

test/data/hosts

@@ -0,0 +1,2 @@
+# localhost
+127.0.0.1 localhost

test/data/hosts.invalid.name

@@ -0,0 +1,2 @@
+# aaa...aa is too long
+127.0.0.1 localhost aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa