Make components' tests run on their own and from main repo.

Each component has dedicated test config and bootstrap.
Duplication of parts of the skeleton is not ideal, but helps to reduce
dependencies between each test suite. Also, this eases the future
subtree split.

Author: clue

phpunit.xml.dist

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         syntaxCheck="false"
+         bootstrap="tests/bootstrap.php"
+>
+    <testsuites>
+        <testsuite name="React Test Suite">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory>./src/</directory>
+        </whitelist>
+    </filter>
+</phpunit>

tests/CallableStub.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace React\Tests\Dns;
+
+class CallableStub
+{
+    public function __invoke()
+    {
+    }
+}

tests/Query/ExecutorTest.php

@@ -295,6 +295,6 @@ protected function expectCallableNever()
 
     protected function createCallableMock()
     {
-        return $this->getMock('React\Tests\Socket\Stub\CallableStub');
+        return $this->getMock('React\Tests\Dns\CallableStub');
     }
 }

tests/Query/RetryExecutorTest.php

@@ -157,7 +157,7 @@ protected function expectPromiseOnce($return = null)
 
     protected function createCallableMock()
     {
-        return $this->getMock('React\Tests\Socket\Stub\CallableStub');
+        return $this->getMock('React\Tests\Dns\CallableStub');
     }
 
     protected function createExecutorMock()

tests/Resolver/ResolverTest.php

@@ -149,7 +149,7 @@ protected function expectCallableNever()
 
     protected function createCallableMock()
     {
-        return $this->getMock('React\Tests\Socket\Stub\CallableStub');
+        return $this->getMock('React\Tests\Dns\CallableStub');
     }
 
     private function createExecutorMock()

tests/bootstrap.php

@@ -0,0 +1,7 @@
+<?php
+
+$loader = @include __DIR__ . '/../vendor/autoload.php';
+if (!$loader) {
+    $loader = require __DIR__ . '/../../../vendor/autoload.php';
+}
+$loader->addPsr4('React\\Tests\\Dns\\', __DIR__);