diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index acd207b..a6964df 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -18,6 +18,9 @@
         <testsuite name="Meritoo Package - Main Test Suite">
             <directory>tests</directory>
         </testsuite>
+        <testsuite name="Collection">
+            <directory>tests/Collection</directory>
+        </testsuite>
     </testsuites>
 
     <filter>
diff --git a/tests/Collection/BaseCollectionTest.php b/tests/Collection/BaseCollectionTest.php
index 0b64961..f6ea186 100644
--- a/tests/Collection/BaseCollectionTest.php
+++ b/tests/Collection/BaseCollectionTest.php
@@ -140,6 +140,24 @@ class BaseCollectionTest extends BaseTestCase
         static::assertInstanceOf(ArrayIterator::class, $this->simpleCollection->getIterator());
     }
 
+    /**
+     * @param mixed               $element       The element to add
+     * @param int                 $expectedCount Expected count of elements in collection
+     * @param CollectionInterface $collection    The collection
+     *
+     * @dataProvider provideElementToAddWithInvalidType
+     */
+    public function testAddWithInvalidType(
+        $element,
+        int $expectedCount,
+        CollectionInterface $collection
+    ): void {
+        $collection->add($element);
+
+        static::assertFalse($collection->has($element));
+        static::assertSame($expectedCount, $collection->count());
+    }
+
     /**
      * @param mixed               $element       The element to add
      * @param int                 $expectedCount Expected count of elements in collection
@@ -371,6 +389,24 @@ class BaseCollectionTest extends BaseTestCase
         static::assertSame($expected, $collection->toArray(), $description);
     }
 
+    public function provideElementToAddWithInvalidType(): ?Generator
+    {
+        yield [
+            ['test'],
+            0,
+            new StringCollection(),
+        ];
+
+        yield [
+            123,
+            2,
+            new StringCollection([
+                'I am 1st',
+                'I am 2nd',
+            ]),
+        ];
+    }
+
     /**
      * Provides element to add to collection
      *