diff --git a/.travis.yml b/.travis.yml
index 7398baf..61e9891 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,9 +22,6 @@ before_install:
 
 install:
   - composer update -n --prefer-dist
-  - mkdir -p coverage/cov coverage/bin
-  - wget https://phar.phpunit.de/phpcov.phar -O coverage/bin/phpcov
-  - chmod +x coverage/bin/phpcov
 
 script:
   - vendor/bin/phpunit --coverage-text --coverage-clover build/logs/clover.xml
@@ -32,10 +29,9 @@ script:
   - vendor/bin/psalm
 
 after_script:
-  - curl -OL https://github.com/php-coveralls/php-coveralls/releases/download/v1.0.0/coveralls.phar
-  - chmod +x coveralls.phar
-  - phpdbg -qrr coverage/bin/phpcov merge --clover build/logs/clover.xml coverage/cov
-  - ./coveralls.phar
+  - curl -OL https://github.com/php-coveralls/php-coveralls/releases/download/v2.2.0/php-coveralls.phar
+  - chmod +x php-coveralls.phar
+  - ./php-coveralls.phar -v
 
 cache:
   directories:
diff --git a/README.md b/README.md
index b900542..e947b57 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # IPC
 
-[![Build Status](https://img.shields.io/travis/danog/loop/master.svg?style=flat-square)](https://travis-ci.com/danog/loop)
+[![Build Status](https://travis-ci.com/danog/loop.svg?branch=master)](https://travis-ci.com/danog/loop)
 ![License](https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square)
 
 `danog/loop` provides a very useful set of async loop APIs based on [AMPHP](https://amphp.org), for executing operations periodically or on demand, in background loops a-la threads.
diff --git a/composer.json b/composer.json
index 9d35987..56f02a3 100644
--- a/composer.json
+++ b/composer.json
@@ -43,6 +43,6 @@
         ],
         "cs": "php-cs-fixer fix -v --diff --dry-run",
         "cs-fix": "php-cs-fixer fix -v --diff",
-        "test": "@php -dzend.assertions=1 -dassert.exception=1 ./vendor/bin/phpunit --coverage-text"
+        "test": "phpdbg -qrr -dzend.assertions=1 -dassert.exception=1 ./vendor/bin/phpunit --coverage-text"
     }
 }
diff --git a/lib/Generic/PeriodicLoop.php b/lib/Generic/PeriodicLoop.php
index 42e09d4..7af7fda 100644
--- a/lib/Generic/PeriodicLoop.php
+++ b/lib/Generic/PeriodicLoop.php
@@ -20,6 +20,12 @@ use danog\Loop\ResumableSignalLoop;
  * The loop can be stopped from the outside or
  * from the inside by signaling or returning `true`.
  *
+ * @template T as bool
+ * @template TGenerator as \Generator<mixed,Promise|array<array-key,Promise>,mixed,Promise<T>|T>
+ * @template TPromise as Promise<T>
+ *
+ * @template TCallable as T|TPromise|TGenerator
+ *
  * @author Daniil Gentili <daniil@daniil.it>
  */
 class PeriodicLoop extends ResumableSignalLoop
@@ -28,6 +34,8 @@ class PeriodicLoop extends ResumableSignalLoop
      * Callback.
      *
      * @var callable
+     *
+     * @psalm-var callable():TCallable
      */
     private $callback;
     /**
@@ -48,6 +56,8 @@ class PeriodicLoop extends ResumableSignalLoop
      * @param callable $callback Callback to call
      * @param string   $name     Loop name
      * @param ?int     $interval Loop interval
+     *
+     * @psalm-param callable():TCallable $callback Callable to run
      */
     public function __construct(callable $callback, string $name, ?int $interval)
     {
@@ -65,16 +75,21 @@ class PeriodicLoop extends ResumableSignalLoop
         $callback = $this->callback;
         while (true) {
             /** @psalm-suppress MixedAssignment */
-            $result = yield $this->waitSignal($this->pause($this->interval));
-            if ($result) {
+            $result = $callback();
+            if ($result instanceof \Generator) {
+                /** @psalm-var TGenerator */
+                $result = yield from $result;
+            } elseif ($result instanceof Promise) {
+                /** @psalm-var TPromise */
+                $result = yield $result;
+            }
+            if ($result === true) {
                 return;
             }
             /** @psalm-suppress MixedAssignment */
-            $result = $callback();
-            if ($result instanceof \Generator) {
-                yield from $result;
-            } elseif ($result instanceof Promise) {
-                yield $result;
+            $result = yield $this->waitSignal($this->pause($this->interval));
+            if ($result === true) {
+                return;
             }
         }
     }
diff --git a/test/Fixtures.php b/test/Fixtures.php
index af3481a..e05a77d 100644
--- a/test/Fixtures.php
+++ b/test/Fixtures.php
@@ -26,7 +26,7 @@ abstract class Fixtures extends AsyncTestCase
      *
      * @return boolean
      */
-    public static function isResolved(Promise $promise): bool
+    protected static function isResolved(Promise $promise): bool
     {
         $resolved = false;
         $promise->onResolve(static function ($e, $res) use (&$resolved) {
@@ -44,7 +44,7 @@ abstract class Fixtures extends AsyncTestCase
      *
      * @return void
      */
-    public function assertPreStart(BasicInterface $loop)
+    protected function assertPreStart(BasicInterface $loop)
     {
         $this->assertEquals(self::LOOP_NAME, "$loop");
 
@@ -64,7 +64,7 @@ abstract class Fixtures extends AsyncTestCase
      *
      * @return void
      */
-    public function assertAfterStart(BasicInterface $loop, bool $running = true)
+    protected function assertAfterStart(BasicInterface $loop, bool $running = true)
     {
         $this->assertTrue($loop->inited());
 
@@ -85,7 +85,7 @@ abstract class Fixtures extends AsyncTestCase
      *
      * @return void
      */
-    public function assertFinal(BasicInterface $loop)
+    protected function assertFinal(BasicInterface $loop)
     {
         $this->assertTrue($loop->ran());
         $this->assertFalse($loop->isRunning());
diff --git a/test/GenericTest.php b/test/GenericTest.php
new file mode 100644
index 0000000..0cf248c
--- /dev/null
+++ b/test/GenericTest.php
@@ -0,0 +1,187 @@
+<?php
+/**
+ * Loop test.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
+ * @license   https://opensource.org/licenses/MIT MIT
+ */
+
+namespace danog\Loop\Test;
+
+use Amp\PHPUnit\AsyncTestCase;
+use Amp\Promise;
+use Amp\Success;
+use danog\Loop\Generic\GenericLoop;
+use danog\Loop\Loop;
+use danog\Loop\Test\Interfaces\LoggingPauseInterface;
+use danog\Loop\Test\Traits\Basic;
+use danog\Loop\Test\Traits\LoggingPause;
+
+use function Amp\delay;
+
+class GenericTest extends AsyncTestCase
+{
+    /**
+     * Test basic loop.
+     *
+     * @param bool $stopSig Whether to stop with signal
+     *
+     * @return \Generator
+     *
+     * @dataProvider provideTrueFalse
+     */
+    public function testGeneric(bool $stopSig): \Generator
+    {
+        $runCount = 0;
+        $pauseTime = GenericLoop::PAUSE;
+        $callable = function () use (&$runCount, &$pauseTime) {
+            $runCount++;
+            return $pauseTime;
+        };
+        yield from $this->fixtureAssertions($callable, $runCount, $pauseTime, $stopSig);
+    }
+    /**
+     * Test generator loop.
+     *
+     * @param bool $stopSig Whether to stop with signal
+     *
+     * @return \Generator
+     *
+     * @dataProvider provideTrueFalse
+     */
+    public function testGenerator(bool $stopSig): \Generator
+    {
+        $runCount = 0;
+        $pauseTime = GenericLoop::PAUSE;
+        $callable = function () use (&$runCount, &$pauseTime): \Generator {
+            yield delay(1);
+            $runCount++;
+            return $pauseTime;
+        };
+        yield from $this->fixtureAssertions($callable, $runCount, $pauseTime, $stopSig);
+    }
+    /**
+     * Test promise loop.
+     *
+     * @param bool $stopSig Whether to stop with signal
+     *
+     * @return \Generator
+     *
+     * @dataProvider provideTrueFalse
+     */
+    public function testPromise(bool $stopSig): \Generator
+    {
+        $runCount = 0;
+        $pauseTime = GenericLoop::PAUSE;
+        $callable = function () use (&$runCount, &$pauseTime): Promise {
+            $runCount++;
+            return new Success($pauseTime);
+        };
+        yield from $this->fixtureAssertions($callable, $runCount, $pauseTime, $stopSig);
+    }
+    /**
+     * Fixture assertions for started loop.
+     *
+     * @param LoggingPauseInterface $loop Loop
+     *
+     * @return void
+     */
+    private function fixtureStarted(LoggingPauseInterface $loop): void
+    {
+        $this->assertTrue($loop->isRunning());
+        $this->assertEquals(1, $loop->startCounter());
+        $this->assertEquals(0, $loop->endCounter());
+    }
+    /**
+     * Run fixture assertions.
+     *
+     * @param \Closure $closure   Closure
+     * @param integer  $runCount  Run count
+     * @param ?integer $pauseTime Pause time
+     * @param bool     $stopSig   Whether to stop with signal
+     *
+     * @return \Generator
+     */
+    private function fixtureAssertions(\Closure $closure, int &$runCount, ?int &$pauseTime, bool $stopSig = false): \Generator
+    {
+        $loop = new class($closure, Fixtures::LOOP_NAME) extends GenericLoop implements LoggingPauseInterface {
+            use LoggingPause;
+        };
+        $this->assertEquals(Fixtures::LOOP_NAME, "$loop");
+
+        $this->assertFalse($loop->isRunning());
+        $this->assertEquals(0, $loop->startCounter());
+        $this->assertEquals(0, $loop->endCounter());
+
+        $this->assertEquals(0, $runCount);
+        $this->assertEquals(0, $loop->getPauseCount());
+
+        $loop->start();
+        yield delay(2);
+        $this->fixtureStarted($loop);
+
+        $this->assertEquals(1, $runCount);
+        $this->assertEquals(1, $loop->getPauseCount());
+        $this->assertEquals(0, $loop->getLastPause());
+
+        $pauseTime = 100;
+        $loop->resume();
+        yield delay(2);
+        $this->fixtureStarted($loop);
+
+        $this->assertEquals(2, $runCount);
+        $this->assertEquals(2, $loop->getPauseCount());
+        $this->assertEquals(100, $loop->getLastPause());
+
+        yield delay(48);
+        $this->fixtureStarted($loop);
+
+        $this->assertEquals(2, $runCount);
+        $this->assertEquals(2, $loop->getPauseCount());
+        $this->assertEquals(100, $loop->getLastPause());
+
+        yield delay(60);
+        $this->fixtureStarted($loop);
+
+        $this->assertEquals(3, $runCount);
+        $this->assertEquals(3, $loop->getPauseCount());
+        $this->assertEquals(100, $loop->getLastPause());
+
+        $loop->resume();
+        yield delay(1);
+
+        $this->assertEquals(4, $runCount);
+        $this->assertEquals(4, $loop->getPauseCount());
+        $this->assertEquals(100, $loop->getLastPause());
+
+        if ($stopSig) {
+            $loop->signal(true);
+        } else {
+            $pauseTime = GenericLoop::STOP;
+            $loop->resume();
+        }
+        yield delay(1);
+        $this->assertEquals($stopSig ? 4 : 5, $runCount);
+        $this->assertEquals(4, $loop->getPauseCount());
+        $this->assertEquals(100, $loop->getLastPause());
+
+        $this->assertFalse($loop->isRunning());
+
+        $this->assertEquals(1, $loop->startCounter());
+        $this->assertEquals(1, $loop->endCounter());
+    }
+
+    /**
+     * Provide true false.
+     *
+     * @return array
+     */
+    public function provideTrueFalse(): array
+    {
+        return [
+            [true],
+            [false]
+        ];
+    }
+}
diff --git a/test/Interfaces/BasicInterface.php b/test/Interfaces/BasicInterface.php
index da3bc8f..3a425ae 100644
--- a/test/Interfaces/BasicInterface.php
+++ b/test/Interfaces/BasicInterface.php
@@ -17,7 +17,7 @@ use danog\Loop\Interfaces\LoopInterface;
  *
  * @author Daniil Gentili <daniil@daniil.it>
  */
-interface BasicInterface extends LoopInterface
+interface BasicInterface extends LoopInterface, LoggingInterface
 {
     /**
      * Check whether the loop inited.
@@ -31,16 +31,4 @@ interface BasicInterface extends LoopInterface
      * @return boolean
      */
     public function ran(): bool;
-    /**
-     * Get start counter.
-     *
-     * @return integer
-     */
-    public function startCounter(): int;
-    /**
-     * Get end counter.
-     *
-     * @return integer
-     */
-    public function endCounter(): int;
 }
diff --git a/test/Interfaces/IntervalInterface.php b/test/Interfaces/IntervalInterface.php
new file mode 100644
index 0000000..272399d
--- /dev/null
+++ b/test/Interfaces/IntervalInterface.php
@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * Resumable loop test interface.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
+ * @license   https://opensource.org/licenses/MIT MIT
+ */
+
+namespace danog\Loop\Test\Interfaces;
+
+/**
+ * Resumable loop test interface.
+ *
+ * @author Daniil Gentili <daniil@daniil.it>
+ */
+interface IntervalInterface
+{
+    /**
+     * Set sleep interval.
+     *
+     * @param ?int $interval Interval
+     *
+     * @return void
+     */
+    public function setInterval(?int $interval): void;
+}
diff --git a/test/Interfaces/LoggingInterface.php b/test/Interfaces/LoggingInterface.php
new file mode 100644
index 0000000..038ba42
--- /dev/null
+++ b/test/Interfaces/LoggingInterface.php
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * Basic loop test interface.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
+ * @license   https://opensource.org/licenses/MIT MIT
+ */
+
+namespace danog\Loop\Test\Interfaces;
+
+use danog\Loop\Interfaces\LoopInterface;
+
+/**
+ * Basic loop test interface.
+ *
+ * @author Daniil Gentili <daniil@daniil.it>
+ */
+interface LoggingInterface extends LoopInterface
+{
+    /**
+     * Get start counter.
+     *
+     * @return integer
+     */
+    public function startCounter(): int;
+    /**
+     * Get end counter.
+     *
+     * @return integer
+     */
+    public function endCounter(): int;
+}
diff --git a/test/Interfaces/LoggingPauseInterface.php b/test/Interfaces/LoggingPauseInterface.php
new file mode 100644
index 0000000..3281443
--- /dev/null
+++ b/test/Interfaces/LoggingPauseInterface.php
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * Basic loop test interface.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
+ * @license   https://opensource.org/licenses/MIT MIT
+ */
+
+namespace danog\Loop\Test\Interfaces;
+
+use danog\Loop\Interfaces\LoopInterface;
+
+/**
+ * Basic loop test interface.
+ *
+ * @author Daniil Gentili <daniil@daniil.it>
+ */
+interface LoggingPauseInterface extends LoopInterface, LoggingInterface
+{
+    /**
+     * Get number of times loop was paused.
+     *
+     * @return integer
+     */
+    public function getPauseCount(): int;
+    /**
+     * Get last pause.
+     *
+     * @return integer
+     */
+    public function getLastPause(): int;
+}
diff --git a/test/Interfaces/ResumableInterface.php b/test/Interfaces/ResumableInterface.php
index d800d16..42c1db0 100644
--- a/test/Interfaces/ResumableInterface.php
+++ b/test/Interfaces/ResumableInterface.php
@@ -10,19 +10,13 @@
 
 namespace danog\Loop\Test\Interfaces;
 
+use danog\Loop\Interfaces\ResumableLoopInterface;
+
 /**
  * Resumable loop test interface.
  *
  * @author Daniil Gentili <daniil@daniil.it>
  */
-interface ResumableInterface extends BasicInterface
+interface ResumableInterface extends BasicInterface, IntervalInterface, ResumableLoopInterface
 {
-    /**
-     * Set sleep interval.
-     *
-     * @param ?int $interval Interval
-     *
-     * @return void
-     */
-    public function setInterval(?int $interval): void;
 }
diff --git a/test/Interfaces/SignalInterface.php b/test/Interfaces/SignalInterface.php
index 410807d..8cc996e 100644
--- a/test/Interfaces/SignalInterface.php
+++ b/test/Interfaces/SignalInterface.php
@@ -17,7 +17,7 @@ use danog\Loop\Interfaces\SignalLoopInterface;
  *
  * @author Daniil Gentili <daniil@daniil.it>
  */
-interface SignalInterface extends ResumableInterface, SignalLoopInterface
+interface SignalInterface extends BasicInterface, IntervalInterface, SignalLoopInterface
 {
     /**
      * Get signaled payload.
diff --git a/test/PeriodicTest.php b/test/PeriodicTest.php
new file mode 100644
index 0000000..7e19a58
--- /dev/null
+++ b/test/PeriodicTest.php
@@ -0,0 +1,167 @@
+<?php
+/**
+ * Loop test.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
+ * @license   https://opensource.org/licenses/MIT MIT
+ */
+
+namespace danog\Loop\Test;
+
+use Amp\PHPUnit\AsyncTestCase;
+use Amp\Promise;
+use Amp\Success;
+use danog\Loop\Generic\PeriodicLoop;
+use danog\Loop\Loop;
+use danog\Loop\Test\Interfaces\LoggingInterface;
+use danog\Loop\Test\Traits\Basic;
+use danog\Loop\Test\Traits\Logging;
+
+use function Amp\delay;
+
+class PeriodicTest extends AsyncTestCase
+{
+    /**
+     * Test basic loop.
+     *
+     * @param bool $stopSig Whether to stop with signal
+     *
+     * @return \Generator
+     *
+     * @dataProvider provideTrueFalse
+     */
+    public function testGeneric(bool $stopSig): \Generator
+    {
+        $runCount = 0;
+        $retValue = false;
+        $callable = function () use (&$runCount, &$retValue) {
+            $runCount++;
+            return $retValue;
+        };
+        yield from $this->fixtureAssertions($callable, $runCount, $retValue, $stopSig);
+    }
+    /**
+     * Test generator loop.
+     *
+     * @param bool $stopSig Whether to stop with signal
+     *
+     * @return \Generator
+     *
+     * @dataProvider provideTrueFalse
+     */
+    public function testGenerator(bool $stopSig): \Generator
+    {
+        $runCount = 0;
+        $retValue = false;
+        $callable = function () use (&$runCount, &$retValue): \Generator {
+            yield delay(1);
+            $runCount++;
+            return $retValue;
+        };
+        yield from $this->fixtureAssertions($callable, $runCount, $retValue, $stopSig);
+    }
+    /**
+     * Test promise loop.
+     *
+     * @param bool $stopSig Whether to stop with signal
+     *
+     * @return \Generator
+     *
+     * @dataProvider provideTrueFalse
+     */
+    public function testPromise(bool $stopSig): \Generator
+    {
+        $runCount = 0;
+        $retValue = false;
+        $callable = function () use (&$runCount, &$retValue): Promise {
+            $runCount++;
+            return new Success($retValue);
+        };
+        yield from $this->fixtureAssertions($callable, $runCount, $retValue, $stopSig);
+    }
+    /**
+     * Fixture assertions for started loop.
+     *
+     * @param LoggingInterface $loop Loop
+     *
+     * @return void
+     */
+    private function fixtureStarted(LoggingInterface $loop): void
+    {
+        $this->assertTrue($loop->isRunning());
+        $this->assertEquals(1, $loop->startCounter());
+        $this->assertEquals(0, $loop->endCounter());
+    }
+    /**
+     * Run fixture assertions.
+     *
+     * @param \Closure $closure   Closure
+     * @param integer  $runCount  Run count
+     * @param bool     $retValue Pause time
+     * @param bool     $stopSig   Whether to stop with signal
+     *
+     * @return \Generator
+     */
+    private function fixtureAssertions(\Closure $closure, int &$runCount, bool &$retValue, bool $stopSig = false): \Generator
+    {
+        $loop = new class($closure, Fixtures::LOOP_NAME, 100) extends PeriodicLoop implements LoggingInterface {
+            use Logging;
+        };
+        $this->assertEquals(Fixtures::LOOP_NAME, "$loop");
+
+        $this->assertFalse($loop->isRunning());
+        $this->assertEquals(0, $loop->startCounter());
+        $this->assertEquals(0, $loop->endCounter());
+
+        $this->assertEquals(0, $runCount);
+
+        $loop->start();
+        yield delay(2);
+        $this->fixtureStarted($loop);
+
+        $this->assertEquals(1, $runCount);
+
+        yield delay(48);
+        $this->fixtureStarted($loop);
+
+        $this->assertEquals(1, $runCount);
+
+        yield delay(60);
+        $this->fixtureStarted($loop);
+
+        $this->assertEquals(2, $runCount);
+
+        $loop->resume();
+        yield delay(1);
+
+        $this->assertEquals(3, $runCount);
+
+        if ($stopSig) {
+            $loop->signal(true);
+        } else {
+            $retValue = true;
+            $loop->resume();
+        }
+        yield delay(1);
+        $this->assertEquals($stopSig ? 3 : 4, $runCount);
+
+        $this->assertFalse($loop->isRunning());
+
+        $this->assertEquals(1, $loop->startCounter());
+        $this->assertEquals(1, $loop->endCounter());
+    }
+
+    /**
+     * Provide true false.
+     *
+     * @return array
+     */
+    public function provideTrueFalse(): array
+    {
+        return [
+            [true],
+            [false]
+        ];
+    }
+}
diff --git a/test/Traits/Basic.php b/test/Traits/Basic.php
index dd54b55..53e002f 100644
--- a/test/Traits/Basic.php
+++ b/test/Traits/Basic.php
@@ -16,18 +16,7 @@ use function Amp\delay;
 
 trait Basic
 {
-    /**
-     * Check whether the loop started.
-     *
-     * @var int
-     */
-    private $startCounter = 0;
-    /**
-     * Check whether the loop ended.
-     *
-     * @var int
-     */
-    private $endCounter = 0;
+    use Logging;
     /**
      * Check whether the loop inited.
      *
@@ -78,44 +67,4 @@ trait Basic
     {
         return LoopTest::LOOP_NAME;
     }
-
-    /**
-     * Signal that loop started.
-     *
-     * @return void
-     */
-    protected function startedLoop(): void
-    {
-        $this->startCounter++;
-        parent::startedLoop();
-    }
-    /**
-     * Signal that loop ended.
-     *
-     * @return void
-     */
-    protected function exitedLoop(): void
-    {
-        $this->endCounter++;
-        parent::exitedLoop();
-    }
-
-    /**
-     * Get start counter.
-     *
-     * @return integer
-     */
-    public function startCounter(): int
-    {
-        return $this->startCounter;
-    }
-    /**
-     * Get end counter.
-     *
-     * @return integer
-     */
-    public function endCounter(): int
-    {
-        return $this->endCounter;
-    }
 }
diff --git a/test/Traits/Logging.php b/test/Traits/Logging.php
new file mode 100644
index 0000000..606b3b8
--- /dev/null
+++ b/test/Traits/Logging.php
@@ -0,0 +1,66 @@
+<?php
+/**
+ * Loop test trait.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
+ * @license   https://opensource.org/licenses/MIT MIT
+ */
+
+namespace danog\Loop\Test\Traits;
+
+trait Logging
+{
+    /**
+     * Check whether the loop started.
+     *
+     * @var int
+     */
+    private $startCounter = 0;
+    /**
+     * Check whether the loop ended.
+     *
+     * @var int
+     */
+    private $endCounter = 0;
+
+    /**
+     * Signal that loop started.
+     *
+     * @return void
+     */
+    protected function startedLoop(): void
+    {
+        $this->startCounter++;
+        parent::startedLoop();
+    }
+    /**
+     * Signal that loop ended.
+     *
+     * @return void
+     */
+    protected function exitedLoop(): void
+    {
+        $this->endCounter++;
+        parent::exitedLoop();
+    }
+
+    /**
+     * Get start counter.
+     *
+     * @return integer
+     */
+    public function startCounter(): int
+    {
+        return $this->startCounter;
+    }
+    /**
+     * Get end counter.
+     *
+     * @return integer
+     */
+    public function endCounter(): int
+    {
+        return $this->endCounter;
+    }
+}
diff --git a/test/Traits/LoggingPause.php b/test/Traits/LoggingPause.php
new file mode 100644
index 0000000..2600ee1
--- /dev/null
+++ b/test/Traits/LoggingPause.php
@@ -0,0 +1,60 @@
+<?php
+/**
+ * Loop test trait.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
+ * @license   https://opensource.org/licenses/MIT MIT
+ */
+
+namespace danog\Loop\Test\Traits;
+
+use function Amp\delay;
+
+trait LoggingPause
+{
+    use Logging;
+    /**
+     * Number of times loop was paused.
+     *
+     * @var integer
+     */
+    private $pauseCount = 0;
+    /**
+     * Last pause delay.
+     *
+     * @var int
+     */
+    private $lastPause = 0;
+    /**
+     * Get number of times loop was paused.
+     *
+     * @return integer
+     */
+    public function getPauseCount(): int
+    {
+        return $this->pauseCount;
+    }
+
+    /**
+     * Get last pause.
+     *
+     * @return integer
+     */
+    public function getLastPause(): int
+    {
+        return $this->lastPause;
+    }
+    /**
+     * Report pause, can be overriden for logging.
+     *
+     * @param integer $timeout Pause duration, 0 = forever
+     *
+     * @return void
+     */
+    protected function reportPause(int $timeout): void
+    {
+        $this->pauseCount++;
+        $this->lastPause= $timeout;
+    }
+}
diff --git a/test/Traits/Signal.php b/test/Traits/Signal.php
index feff9b4..125eaca 100644
--- a/test/Traits/Signal.php
+++ b/test/Traits/Signal.php
@@ -48,6 +48,17 @@ trait Signal
     {
         return $this->exception;
     }
+    /**
+     * Test waiting signal on interval.
+     *
+     * @param integer $interval Interval
+     *
+     * @return \Generator
+     */
+    private function testGenerator(int $interval): \Generator
+    {
+        yield delay($interval);
+    }
     /**
      * Loop implementation.
      *
@@ -58,7 +69,7 @@ trait Signal
         $this->inited = true;
         try {
             while (true) {
-                $this->payload = yield $this->waitSignal($this instanceof ResumableLoopInterface ? $this->pause($this->interval) : delay($this->interval));
+                $this->payload = yield $this->waitSignal($this instanceof ResumableLoopInterface ? $this->pause($this->interval) : $this->testGenerator($this->interval));
             }
         } catch (\Throwable $e) {
             $this->exception = $e;