add tests to ensure data of all types preserved correctly

(cherry picked from commit c5af41a)

tests/TestStorageTrait.php

@@ -60,6 +60,31 @@ public function test_store_with_ttl()
 		$this->assertNull($storage->retrieve($key));
 	}
 
+	public function data_store_type()
+	{
+		return [
+			'null' => [null],
+			'array' => [[]],
+			'false' => [false],
+			'int' => [1],
+			'zero' => [0],
+			'float' => [3.14],
+			'string' => ['test'],
+			'empty string' => [''],
+		];
+	}
+
+	/**
+	 * @dataProvider data_store_type
+	 */
+	public function test_store_type($data)
+	{
+		$storage = $this->storage;
+
+		$storage->store('test', $data);
+		$this->assertSame($data, $storage->retrieve('test'));
+	}
+
 	public function test_iterator()
 	{
 		$s = $this->storage;