Add test for fallback to blocking resolver (#108)

Co-authored-by: Niklas Keller <[email protected]>

test/IntegrationTest.php

@@ -4,6 +4,7 @@
 
 use Amp\Cache\NullCache;
 use Amp\Dns;
+use Amp\Dns\DnsConfigException;
 use Amp\Dns\DnsException;
 use Amp\Dns\DnsRecord;
 use Amp\Dns\UnixDnsConfigLoader;
@@ -139,6 +140,28 @@ public function testResolveWithRotateList(): void
  self::assertNotSame($record1->getValue(), $record2->getValue());
  }
 
+ public function testResolveWithBlockingResolver(): void
+ {
+ /** @var Dns\DnsConfigLoader|MockObject $configLoader */
+ $configLoader = $this->createMock(Dns\DnsConfigLoader::class);
+ $configLoader->expects(self::once())
+ ->method('loadConfig')
+ ->willThrowException(new DnsConfigException("Can't access /etc/resolv.conf!"));
+
+ $resolver = new Dns\Rfc1035StubDnsResolver(new NullCache(), $configLoader);
+
+ $records = $resolver->query('google.com', Dns\DnsRecord::A);
+
+ foreach ($records as $record) {
+ self::assertSame(DnsRecord::A, $record->getType());
+ $inAddr = \inet_pton($record->getValue());
+ self::assertNotFalse(
+ $inAddr,
+ "Server name google.com did not resolve to a valid IP address"
+ );
+ }
+ }
+
  public function testPtrLookup(): void
  {
  $result = Dns\query("8.8.4.4", DnsRecord::PTR);