diff --git a/tests/RRuleTest.php b/tests/RRuleTest.php
new file mode 100644
index 0000000..8316577
--- /dev/null
+++ b/tests/RRuleTest.php
@@ -0,0 +1,109 @@
+<?php
+
+namespace ipl\Tests\Scheduler;
+
+use DateTime;
+use ipl\Scheduler\RRule;
+use PHPUnit\Framework\TestCase;
+
+class RRuleTest extends TestCase
+{
+    public function testIsDueWithoutEndTime()
+    {
+        $start = new DateTime();
+        $rrule = (new RRule('FREQ=MINUTELY'))
+            ->startAt($start);
+
+        $start->setTime($start->format('H'), $start->format('i'), $start->format('s'));
+
+        $this->assertTrue($rrule->isDue((clone $start)->modify('+1 minute')));
+    }
+
+    public function testIsDueWithEndTime()
+    {
+        $start = new DateTime();
+        $start->setTime($start->format('H'), $start->format('i'), $start->format('s'));
+
+        $end = clone $start;
+        $end->modify('+2 minute');
+
+        $rrule = (new RRule('FREQ=MINUTELY'))
+            ->startAt($start)
+            ->endAt($end);
+
+        $this->assertTrue($rrule->isDue((clone $start)->modify('+1 minute')));
+        $this->assertFalse($rrule->isDue((clone $end)->modify('+1 minute')));
+    }
+
+    public function testIsExpiredWithoutEndTime()
+    {
+        $rrule = (new RRule('FREQ=MINUTELY'))
+            ->startAt(new DateTime());
+
+        $this->assertFalse($rrule->isExpired(new DateTime('+1 day')));
+    }
+
+    public function testIsExpiredWithEndTime()
+    {
+        $rrule = (new RRule('FREQ=MINUTELY'))
+            ->startAt(new DateTime())
+            ->endAt(new DateTime('+5 minute'));
+
+        $this->assertFalse($rrule->isExpired(new DateTime('+2 minute')));
+        $this->assertTrue($rrule->isExpired(new DateTime('+10 minute')));
+    }
+
+    public function testGetNextDueWithoutEndTime()
+    {
+        $start = new DateTime();
+        $start->setTime($start->format('H'), $start->format('i'), $start->format('s'));
+
+        $rrule = (new RRule('FREQ=MINUTELY'))
+            ->startAt($start);
+
+        $this->assertEquals((clone $start)->modify('+1 minute'), $rrule->getNextDue($start));
+    }
+
+    public function testGetNextDueWithEndTime()
+    {
+        $end = new DateTime('+5 minutes');
+        $rrule = (new RRule('FREQ=MINUTELY'))
+            ->startAt(new DateTime())
+            ->endAt($end);
+
+        $this->assertEquals($end, $rrule->getNextDue(new DateTime('+2 hours')));
+    }
+
+    public function testGetNextRecurrencesWithDefaultLimit()
+    {
+        $rrule = (new RRule('FREQ=MINUTELY'))
+            ->startAt(new DateTime('-1 hour'));
+
+        $this->assertCount(1, iterator_to_array($rrule->getNextRecurrences(new DateTime())));
+    }
+
+    public function testGetNextRecurrencesWithCustomResultSetLimit()
+    {
+        $start = new DateTime('-2 day');
+        $rrule = (new RRule('FREQ=MINUTELY'))
+            ->startAt($start)
+            ->limitTransformer(5);
+
+        $this->assertCount(5, iterator_to_array($rrule->getNextRecurrences(new DateTime())));
+
+        $start->modify('+2 day');
+        $rrule->startAt($start);
+
+        $this->assertCount(5, iterator_to_array($rrule->getNextRecurrences(new DateTime())));
+    }
+
+    public function testMonthlyOn31DoesNotSkippFebruaryAndOtherMonths()
+    {
+        $start = new DateTime('January 31');
+        $recurrences = (new RRule('FREQ=MONTHLY'))
+            ->startAt($start)
+            ->getNextRecurrences($start->modify('+5 days'));
+
+        $this->assertEquals(new DateTime('February 28'), $recurrences->current());
+    }
+}