diff --git a/src/Illuminate/Cache/Lock.php b/src/Illuminate/Cache/Lock.php
index bed170507a9a..ccd1c6474a5f 100644
--- a/src/Illuminate/Cache/Lock.php
+++ b/src/Illuminate/Cache/Lock.php
@@ -5,6 +5,7 @@
 use Illuminate\Contracts\Cache\Lock as LockContract;
 use Illuminate\Contracts\Cache\LockTimeoutException;
 use Illuminate\Support\InteractsWithTime;
+use Illuminate\Support\Sleep;
 use Illuminate\Support\Str;
 
 abstract class Lock implements LockContract
@@ -114,7 +115,7 @@ public function block($seconds, $callback = null)
         $starting = $this->currentTime();
 
         while (! $this->acquire()) {
-            usleep($this->sleepMilliseconds * 1000);
+            Sleep::usleep($this->sleepMilliseconds * 1000);
 
             if ($this->currentTime() - $seconds >= $starting) {
                 throw new LockTimeoutException;
diff --git a/src/Illuminate/Foundation/Testing/TestCase.php b/src/Illuminate/Foundation/Testing/TestCase.php
index 9fae49f6bc2e..a7315a2c5124 100644
--- a/src/Illuminate/Foundation/Testing/TestCase.php
+++ b/src/Illuminate/Foundation/Testing/TestCase.php
@@ -10,6 +10,7 @@
 use Illuminate\Support\Carbon;
 use Illuminate\Support\Facades\Facade;
 use Illuminate\Support\Facades\ParallelTesting;
+use Illuminate\Support\Sleep;
 use Illuminate\Support\Str;
 use Illuminate\View\Component;
 use Mockery;
@@ -245,6 +246,7 @@ protected function tearDown(): void
         Component::forgetFactory();
         Queue::createPayloadUsing(null);
         HandleExceptions::forgetApp();
+        Sleep::fake(false);
 
         if ($this->callbackException) {
             throw $this->callbackException;
diff --git a/src/Illuminate/Redis/Limiters/ConcurrencyLimiter.php b/src/Illuminate/Redis/Limiters/ConcurrencyLimiter.php
index e249053e2cc9..62e50b01aad1 100644
--- a/src/Illuminate/Redis/Limiters/ConcurrencyLimiter.php
+++ b/src/Illuminate/Redis/Limiters/ConcurrencyLimiter.php
@@ -3,6 +3,7 @@
 namespace Illuminate\Redis\Limiters;
 
 use Illuminate\Contracts\Redis\LimiterTimeoutException;
+use Illuminate\Support\Sleep;
 use Illuminate\Support\Str;
 use Throwable;
 
@@ -75,7 +76,7 @@ public function block($timeout, $callback = null, $sleep = 250)
                 throw new LimiterTimeoutException;
             }
 
-            usleep($sleep * 1000);
+            Sleep::usleep($sleep * 1000);
         }
 
         if (is_callable($callback)) {
diff --git a/src/Illuminate/Redis/Limiters/DurationLimiter.php b/src/Illuminate/Redis/Limiters/DurationLimiter.php
index 65297ff9f65f..b0ecdaf9f4b4 100644
--- a/src/Illuminate/Redis/Limiters/DurationLimiter.php
+++ b/src/Illuminate/Redis/Limiters/DurationLimiter.php
@@ -3,6 +3,7 @@
 namespace Illuminate\Redis\Limiters;
 
 use Illuminate\Contracts\Redis\LimiterTimeoutException;
+use Illuminate\Support\Sleep;
 
 class DurationLimiter
 {
@@ -84,7 +85,7 @@ public function block($timeout, $callback = null, $sleep = 750)
                 throw new LimiterTimeoutException;
             }
 
-            usleep($sleep * 1000);
+            Sleep::usleep($sleep * 1000);
         }
 
         if (is_callable($callback)) {
diff --git a/src/Illuminate/Support/Sleep.php b/src/Illuminate/Support/Sleep.php
new file mode 100644
index 000000000000..d4ee90f261e1
--- /dev/null
+++ b/src/Illuminate/Support/Sleep.php
@@ -0,0 +1,393 @@
+<?php
+
+namespace Illuminate\Support;
+
+use Carbon\Carbon;
+use Carbon\CarbonInterval;
+use DateInterval;
+use PHPUnit\Framework\Assert as PHPUnit;
+use RuntimeException;
+
+class Sleep
+{
+    /**
+     * The total duration to sleep.
+     *
+     * @var \Carbon\CarbonInterval
+     */
+    public $duration;
+
+    /**
+     * The pending duration to sleep.
+     *
+     * @var int|float|null
+     */
+    protected $pending = null;
+
+    /**
+     * Indicates that all sleeping should be faked.
+     *
+     * @var bool
+     */
+    protected static $fake = false;
+
+    /**
+     * The sequence of sleep durations encountered while faking.
+     *
+     * @var array<int, \Carbon\CarbonInterval>
+     */
+    protected static $sequence = [];
+
+    /**
+     * Indicates if the instance should sleep.
+     *
+     * @var bool
+     */
+    protected $shouldSleep = true;
+
+    /**
+     * Create a new class instance.
+     *
+     * @param  int|float|\DateInterval  $duration
+     * @return void
+     */
+    public function __construct($duration)
+    {
+        if (! $duration instanceof DateInterval) {
+            $this->duration = CarbonInterval::microsecond(0);
+
+            $this->pending = $duration;
+        } else {
+            $duration = CarbonInterval::instance($duration);
+
+            if ($duration->totalMicroseconds < 0) {
+                $duration = CarbonInterval::seconds(0);
+            }
+
+            $this->duration = $duration;
+        }
+    }
+
+    /**
+     * Sleep for the given duration.
+     *
+     * @param  \DateInterval|int|float  $duration
+     * @return static
+     */
+    public static function for($duration)
+    {
+        return new static($duration);
+    }
+
+    /**
+     * Sleep until the given timestamp.
+     *
+     * @param  \DateTimeInterface|int  $timestamp
+     * @return static
+     */
+    public static function until($timestamp)
+    {
+        if (is_int($timestamp)) {
+            $timestamp = Carbon::createFromTimestamp($timestamp);
+        }
+
+        return new static(Carbon::now()->diff($timestamp));
+    }
+
+    /**
+     * Sleep for the given number of microseconds.
+     *
+     * @param  int  $duration
+     * @return static
+     */
+    public static function usleep($duration)
+    {
+        return (new static($duration))->microseconds();
+    }
+
+    /**
+     * Sleep for the given number of seconds.
+     *
+     * @param  int|float  $duration
+     * @return static
+     */
+    public static function sleep($duration)
+    {
+        return (new static($duration))->seconds();
+    }
+
+    /**
+     * Sleep for the given number of minutes.
+     *
+     * @return $this
+     */
+    public function minutes()
+    {
+        $this->duration->add('minutes', $this->pullPending());
+
+        return $this;
+    }
+
+    /**
+     * Sleep for one minute.
+     *
+     * @return $this
+     */
+    public function minute()
+    {
+        return $this->minutes();
+    }
+
+    /**
+     * Sleep for the given number of seconds.
+     *
+     * @return $this
+     */
+    public function seconds()
+    {
+        $this->duration->add('seconds', $this->pullPending());
+
+        return $this;
+    }
+
+    /**
+     * Sleep for one second.
+     *
+     * @return $this
+     */
+    public function second()
+    {
+        return $this->seconds();
+    }
+
+    /**
+     * Sleep for the given number of milliseconds.
+     *
+     * @return $this
+     */
+    public function milliseconds()
+    {
+        $this->duration->add('milliseconds', $this->pullPending());
+
+        return $this;
+    }
+
+    /**
+     * Sleep for one millisecond.
+     *
+     * @return $this
+     */
+    public function millisecond()
+    {
+        return $this->milliseconds();
+    }
+
+    /**
+     * Sleep for the given number of microseconds.
+     *
+     * @return $this
+     */
+    public function microseconds()
+    {
+        $this->duration->add('microseconds', $this->pullPending());
+
+        return $this;
+    }
+
+    /**
+     * Sleep for on microsecond.
+     *
+     * @return $this
+     */
+    public function microsecond()
+    {
+        return $this->microseconds();
+    }
+
+    /**
+     * Add additional time to sleep for.
+     *
+     * @param  int|float  $duration
+     * @return $this
+     */
+    public function and($duration)
+    {
+        $this->pending = $duration;
+
+        return $this;
+    }
+
+    /**
+     * Handle the object's destruction.
+     *
+     * @return void
+     */
+    public function __destruct()
+    {
+        if (! $this->shouldSleep) {
+            return;
+        }
+
+        if ($this->pending !== null) {
+            throw new RuntimeException('Unknown duration unit.');
+        }
+
+        if (static::$fake) {
+            static::$sequence[] = $this->duration;
+
+            return;
+        }
+
+        $remaining = $this->duration->copy();
+
+        $seconds = (int) $remaining->totalSeconds;
+
+        if ($seconds > 0) {
+            sleep($seconds);
+
+            $remaining = $remaining->subSeconds($seconds);
+        }
+
+        $microseconds = (int) $remaining->totalMicroseconds;
+
+        if ($microseconds > 0) {
+            usleep($microseconds);
+        }
+    }
+
+    /**
+     * Resolve the pending duration.
+     *
+     * @return int|float
+     */
+    protected function pullPending()
+    {
+        if ($this->pending === null) {
+            $this->shouldNotSleep();
+
+            throw new RuntimeException('No duration specified.');
+        }
+
+        if ($this->pending < 0) {
+            $this->pending = 0;
+        }
+
+        return tap($this->pending, function () {
+            $this->pending = null;
+        });
+    }
+
+    /**
+     * Stay awake and capture any attempts to sleep.
+     *
+     * @param  bool  $value
+     * @return void
+     */
+    public static function fake($value = true)
+    {
+        static::$fake = $value;
+
+        static::$sequence = [];
+    }
+
+    /**
+     * Assert a given amount of sleeping occurred a specific number of times.
+     *
+     * @param  \Closure  $expected
+     * @param  int  $times
+     * @return void
+     */
+    public static function assertSlept($expected, $times = 1)
+    {
+        $count = collect(static::$sequence)->filter($expected)->count();
+
+        PHPUnit::assertSame(
+            $times,
+            $count,
+            "The expected sleep was found [{$count}] times instead of [{$times}]."
+        );
+    }
+
+    /**
+     * Assert sleeping occurred a given number of times.
+     *
+     * @param  int  $expected
+     * @return void
+     */
+    public static function assertSleptTimes($expected)
+    {
+        PHPUnit::assertSame($expected, $count = count(static::$sequence), "Expected [{$expected}] sleeps but found [{$count}].");
+    }
+
+    /**
+     * Assert the given sleep sequence was encountered.
+     *
+     * @param  array  $sequence
+     * @return void
+     */
+    public static function assertSequence($sequence)
+    {
+        static::assertSleptTimes(count($sequence));
+
+        collect($sequence)
+            ->zip(static::$sequence)
+            ->eachSpread(function (?Sleep $expected, CarbonInterval $actual) {
+                if ($expected === null) {
+                    return;
+                }
+
+                PHPUnit::assertTrue(
+                    $expected->shouldNotSleep()->duration->equalTo($actual),
+                    vsprintf('Expected sleep duration of [%s] but actually slept for [%s].', [
+                        $expected->duration->cascade()->forHumans([
+                            'options' => 0,
+                            'minimumUnit' => 'microsecond',
+                        ]),
+                        $actual->cascade()->forHumans([
+                            'options' => 0,
+                            'minimumUnit' => 'microsecond',
+                        ]),
+                    ])
+                );
+            });
+    }
+
+    /**
+     * Assert that no sleeping occurred.
+     *
+     * @return void
+     */
+    public static function assertNeverSlept()
+    {
+        return static::assertInsomniac();
+    }
+
+    /**
+     * Assert that no sleeping occurred.
+     *
+     * @return void
+     */
+    public static function assertInsomniac()
+    {
+        foreach (static::$sequence as $duration) {
+            PHPUnit::assertSame(0, $duration->totalMicroseconds, vsprintf('Unexpected sleep duration of [%s] found.', [
+                $duration->cascade()->forHumans([
+                    'options' => 0,
+                    'minimumUnit' => 'microsecond',
+                ]),
+            ]));
+        }
+    }
+
+    /**
+     * Indicate that the instance should not sleep.
+     *
+     * @return $this
+     */
+    protected function shouldNotSleep()
+    {
+        $this->shouldSleep = false;
+
+        return $this;
+    }
+}
diff --git a/src/Illuminate/Support/Timebox.php b/src/Illuminate/Support/Timebox.php
index 0d41e0ac2d05..cb99a4a8492d 100644
--- a/src/Illuminate/Support/Timebox.php
+++ b/src/Illuminate/Support/Timebox.php
@@ -79,6 +79,6 @@ public function dontReturnEarly()
      */
     protected function usleep(int $microseconds)
     {
-        usleep($microseconds);
+        Sleep::usleep($microseconds);
     }
 }
diff --git a/src/Illuminate/Support/helpers.php b/src/Illuminate/Support/helpers.php
index 5b3847f4a54f..2907e1249069 100755
--- a/src/Illuminate/Support/helpers.php
+++ b/src/Illuminate/Support/helpers.php
@@ -6,6 +6,7 @@
 use Illuminate\Support\Env;
 use Illuminate\Support\HigherOrderTapProxy;
 use Illuminate\Support\Optional;
+use Illuminate\Support\Sleep;
 use Illuminate\Support\Str;
 
 if (! function_exists('append_config')) {
@@ -253,7 +254,7 @@ function retry($times, callable $callback, $sleepMilliseconds = 0, $when = null)
             $sleepMilliseconds = $backoff[$attempts - 1] ?? $sleepMilliseconds;
 
             if ($sleepMilliseconds) {
-                usleep(value($sleepMilliseconds, $attempts, $e) * 1000);
+                Sleep::usleep(value($sleepMilliseconds, $attempts, $e) * 1000);
             }
 
             goto beginning;
diff --git a/tests/Support/SleepTest.php b/tests/Support/SleepTest.php
new file mode 100644
index 000000000000..38b456893ec9
--- /dev/null
+++ b/tests/Support/SleepTest.php
@@ -0,0 +1,385 @@
+<?php
+
+namespace Illuminate\Tests\Support;
+
+use Carbon\CarbonInterval;
+use Illuminate\Support\Carbon;
+use Illuminate\Support\Sleep;
+use PHPUnit\Framework\AssertionFailedError;
+use PHPUnit\Framework\TestCase;
+use RuntimeException;
+
+class SleepTest extends TestCase
+{
+    protected function tearDown(): void
+    {
+        parent::tearDown();
+
+        Sleep::fake(false);
+
+        Carbon::setTestNow();
+    }
+
+    public function testItSleepsForSeconds()
+    {
+        $start = microtime(true);
+        Sleep::for(1)->seconds();
+        $end = microtime(true);
+
+        $this->assertEqualsWithDelta(1, $end - $start, 0.03);
+    }
+
+    public function testItSleepsForSecondsWithMilliseconds()
+    {
+        $start = microtime(true);
+        Sleep::for(1.5)->seconds();
+        $end = microtime(true);
+
+        $this->assertEqualsWithDelta(1.5, $end - $start, 0.03);
+    }
+
+    public function testItCanFakeSleeping()
+    {
+        Sleep::fake();
+
+        $start = microtime(true);
+        Sleep::for(1.5)->seconds();
+        $end = microtime(true);
+
+        $this->assertEqualsWithDelta(0, $end - $start, 0.03);
+    }
+
+    public function testItCanSpecifyMinutes()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(1.5)->minutes();
+
+        $this->assertSame($sleep->duration->totalMicroseconds, 90_000_000);
+    }
+
+    public function testItCanSpecifyMinute()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(1)->minute();
+
+        $this->assertSame($sleep->duration->totalMicroseconds, 60_000_000);
+    }
+
+    public function testItCanSpecifySeconds()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(1.5)->seconds();
+
+        $this->assertSame($sleep->duration->totalMicroseconds, 1_500_000);
+    }
+
+    public function testItCanSpecifySecond()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(1)->second();
+
+        $this->assertSame($sleep->duration->totalMicroseconds, 1_000_000);
+    }
+
+    public function testItCanSpecifyMilliseconds()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(1.5)->milliseconds();
+
+        $this->assertSame($sleep->duration->totalMicroseconds, 1_500);
+    }
+
+    public function testItCanSpecifyMillisecond()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(1)->millisecond();
+
+        $this->assertSame($sleep->duration->totalMicroseconds, 1_000);
+    }
+
+    public function testItCanSpecifyMicroseconds()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(1.5)->microseconds();
+
+        // rounded as microseconds is the smallest unit supported...
+        $this->assertSame($sleep->duration->totalMicroseconds, 1);
+    }
+
+    public function testItCanSpecifyMicrosecond()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(1)->microsecond();
+
+        $this->assertSame($sleep->duration->totalMicroseconds, 1);
+    }
+
+    public function testItCanChainDurations()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(1)->second()
+                      ->and(500)->microseconds();
+
+        $this->assertSame($sleep->duration->totalMicroseconds, 1000500);
+    }
+
+    public function testItCanUseDateInterval()
+    {
+        Sleep::fake();
+
+        $sleep = Sleep::for(CarbonInterval::seconds(1)->addMilliseconds(5));
+
+        $this->assertSame($sleep->duration->totalMicroseconds, 1_005_000);
+    }
+
+    public function testItThrowsForUnknownTimeUnit()
+    {
+        try {
+            Sleep::for(5);
+            $this->fail();
+        } catch (RuntimeException $e) {
+            $this->assertSame('Unknown duration unit.', $e->getMessage());
+        }
+    }
+
+    public function testItCanAssertSequence()
+    {
+        Sleep::fake();
+
+        Sleep::for(5)->seconds();
+        Sleep::for(1)->seconds()->and(5)->microsecond();
+
+        Sleep::assertSequence([
+            Sleep::for(5)->seconds(),
+            Sleep::for(1)->seconds()->and(5)->microsecond(),
+        ]);
+    }
+
+    public function testItFailsSequenceAssertion()
+    {
+        Sleep::fake();
+
+        Sleep::for(5)->seconds();
+        Sleep::for(1)->seconds()->and(5)->microseconds();
+
+        try {
+            Sleep::assertSequence([
+                Sleep::for(5)->seconds(),
+                Sleep::for(9)->seconds()->and(8)->milliseconds(),
+            ]);
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Expected sleep duration of [9 seconds 8 milliseconds] but actually slept for [1 second 5 microseconds].\nFailed asserting that false is true.", $e->getMessage());
+        }
+    }
+
+    public function testItCanUseSleep()
+    {
+        Sleep::fake();
+
+        Sleep::sleep(3);
+
+        Sleep::assertSequence([
+            Sleep::for(3)->seconds(),
+        ]);
+    }
+
+    public function testItCanUseUSleep()
+    {
+        Sleep::fake();
+
+        Sleep::usleep(3);
+
+        Sleep::assertSequence([
+            Sleep::for(3)->microseconds(),
+        ]);
+    }
+
+    public function testItCanSleepTillGivenTime()
+    {
+        Sleep::fake();
+        Carbon::setTestNow(now()->startOfDay());
+
+        Sleep::until(now()->addMinute());
+
+        Sleep::assertSequence([
+            Sleep::for(60)->seconds(),
+        ]);
+    }
+
+    public function testItCanSleepTillGivenTimestamp()
+    {
+        Sleep::fake();
+        Carbon::setTestNow(now()->startOfDay());
+
+        Sleep::until(now()->addMinute()->timestamp);
+
+        Sleep::assertSequence([
+            Sleep::for(60)->seconds(),
+        ]);
+    }
+
+    public function testItSleepsForZeroTimeWithNegativeDateTime()
+    {
+        Sleep::fake();
+        Carbon::setTestNow(now()->startOfDay());
+
+        Sleep::until(now()->subMinutes(100));
+
+        Sleep::assertSequence([
+            Sleep::for(0)->seconds(),
+        ]);
+    }
+
+    public function testSleepingForZeroTime()
+    {
+        Sleep::fake();
+
+        Sleep::for(0)->seconds();
+
+        try {
+            Sleep::assertSequence([
+                Sleep::for(1)->seconds(),
+            ]);
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Expected sleep duration of [1 second] but actually slept for [0 microseconds].\nFailed asserting that false is true.", $e->getMessage());
+        }
+    }
+
+    public function testItFailsWhenSequenceContainsTooManySleeps()
+    {
+        Sleep::fake();
+
+        Sleep::for(1)->seconds();
+
+        try {
+            Sleep::assertSequence([
+                Sleep::for(1)->seconds(),
+                Sleep::for(1)->seconds(),
+            ]);
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Expected [2] sleeps but found [1].\nFailed asserting that 1 is identical to 2.", $e->getMessage());
+        }
+    }
+
+    public function testSilentlySetsDurationToZeroForNegativeValues()
+    {
+        Sleep::fake();
+
+        Sleep::for(-1)->seconds();
+
+        Sleep::assertSequence([
+            Sleep::for(0)->seconds(),
+        ]);
+    }
+
+    public function testItDoesntCaptureAssertionInstances()
+    {
+        Sleep::fake();
+
+        Sleep::for(1)->second();
+
+        Sleep::assertSequence([
+            Sleep::for(1)->second(),
+        ]);
+
+        try {
+            Sleep::assertSequence([
+                Sleep::for(1)->second(),
+                Sleep::for(1)->second(),
+            ]);
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Expected [2] sleeps but found [1].\nFailed asserting that 1 is identical to 2.", $e->getMessage());
+        }
+    }
+
+    public function testItCanAssertNoSleepingOccurred()
+    {
+        Sleep::fake();
+
+        Sleep::assertInsomniac();
+
+        Sleep::for(0)->second();
+
+        // we still have not slept...
+        Sleep::assertInsomniac();
+
+        Sleep::for(1)->second();
+
+        try {
+            Sleep::assertInsomniac();
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Unexpected sleep duration of [1 second] found.\nFailed asserting that 1000000 is identical to 0.", $e->getMessage());
+        }
+    }
+
+    public function testItCanAssertSleepCount()
+    {
+        Sleep::fake();
+
+        Sleep::assertSleptTimes(0);
+
+        Sleep::for(1)->second();
+
+        Sleep::assertSleptTimes(1);
+
+        try {
+            Sleep::assertSleptTimes(0);
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Expected [0] sleeps but found [1].\nFailed asserting that 1 is identical to 0.", $e->getMessage());
+        }
+
+        try {
+            Sleep::assertSleptTimes(2);
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Expected [2] sleeps but found [1].\nFailed asserting that 1 is identical to 2.", $e->getMessage());
+        }
+    }
+
+    public function testAssertSlept()
+    {
+        Sleep::fake();
+
+        Sleep::assertSlept(fn () => true, 0);
+
+        try {
+            Sleep::assertSlept(fn () => true);
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("The expected sleep was found [0] times instead of [1].\nFailed asserting that 0 is identical to 1.", $e->getMessage());
+        }
+
+        Sleep::for(5)->seconds();
+
+        Sleep::assertSlept(fn (CarbonInterval $duration) => $duration->totalSeconds === 5);
+
+        try {
+            Sleep::assertSlept(fn (CarbonInterval $duration) => $duration->totalSeconds === 5, 2);
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("The expected sleep was found [1] times instead of [2].\nFailed asserting that 1 is identical to 2.", $e->getMessage());
+        }
+
+        try {
+            Sleep::assertSlept(fn (CarbonInterval $duration) => $duration->totalSeconds === 6);
+            $this->fail();
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("The expected sleep was found [0] times instead of [1].\nFailed asserting that 0 is identical to 1.", $e->getMessage());
+        }
+    }
+}