Add test for loop accessor

lib/Loop.php

@@ -358,4 +358,6 @@ final class Loop {
 // Default factory, don't move this a file loaded by the composer "files" autoload mechanism, otherwise custom
 // implementations might have issues setting a default loop, because it's overridden by us then.
 
+// @codeCoverageIgnoreStart
 Loop::set((new DriverFactory)->create());
+// @codeCoverageIgnoreEnd

test/Loop/DriverStateTest.php

@@ -2,6 +2,7 @@
 
 namespace Amp\Test\Loop;
 
+use Amp\Loop;
 use Amp\Loop\Driver;
 use PHPUnit\Framework\TestCase;
 
@@ -27,6 +28,15 @@ class DriverStateTest extends TestCase {
         $this->assertSame($value, $this->loop->getState("foobar"));
     }
 
+    /**
+     * @test
+     * @dataProvider provideValues
+     */
+    public function getsPreviouslySetValueViaAccessor($value) {
+        Loop::setState("foobar", $value);
+        $this->assertSame($value, Loop::getState("foobar"));
+    }
+
     public function provideValues() {
         return [
             ["string"],

test/LoopTest.php

@@ -17,4 +17,33 @@ class LoopTest extends TestCase {
 
         Loop::repeat(-1, function () {});
     }
+
+    public function testOnReadable() {
+        Loop::run(function () {
+            $ends = stream_socket_pair(\stripos(PHP_OS, "win") === 0 ? STREAM_PF_INET : STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
+            fwrite($ends[0], "trigger readability watcher");
+
+            Loop::onReadable($ends[1], function () {
+                $this->assertTrue(true);
+                Loop::stop();
+            });
+        });
+    }
+
+    public function testOnWritable() {
+        Loop::run(function () {
+            Loop::onWritable(STDOUT, function () {
+                $this->assertTrue(true);
+                Loop::stop();
+            });
+        });
+    }
+
+    public function testGet() {
+        $this->assertInstanceOf(Loop\Driver::class, Loop::get());
+    }
+
+    public function testGetInto() {
+        $this->assertSame(Loop::get()->getInfo(), Loop::getInfo());
+    }
 }