fix: use `set` in `get` method consistently

CHANGELOG.md

+## [3.0.2] - Unreleased
+### Fixed
+- `ArrayContainer::get` now uses `ArrayContainer::set` for value presence check
+
 ## [3.0.1] - 2021-08-14
 ### Added
 - Added set_expiration method for WordPressTransientContainer class
@@ -59,4 +63,4 @@
 
 ## [1.0.0] - 2019-02-04
 ### Added
-- first stable version
\ No newline at end of file
+- first stable version

src/Adapter/ArrayContainer.php

@@ -12,45 +12,45 @@ use WPDesk\Persistence\PersistentContainer;
  * @package WPDesk\Persistence
  */
 class ArrayContainer implements PersistentContainer {
-	use FallbackFromGetTrait;
-
-	/** @var array */
-	protected $array;
-
-	public function __construct( array $initial = [] ) {
-		$this->array = $initial;
-	}
-
-	public function set( string $id, $value ) {
-		if ( $value === null ) {
-			$this->delete( $id );
-		} else {
-			$this->array[ $id ] = $value;
-		}
-	}
-
-	public function delete( string $id ) {
-		unset( $this->array[ $id ] );
-	}
-
-	public function has( $id ): bool {
-		return key_exists( $id, $this->array );
-	}
-
-	public function get( $id ) {
-		if ( ! isset( $this->array[ $id ] ) ) {
-			throw new ElementNotExistsException( sprintf( 'Element %s not exists!', $id ) );
-		}
-
-		return $this->array[ $id ];
-	}
-
-	/**
-	 * Return array that is used internally to save the data.
-	 *
-	 * @return array
-	 */
-	public function get_array() {
-		return $this->array;
-	}
-}
\ No newline at end of file
+    use FallbackFromGetTrait;
+
+    /** @var array */
+    protected $array;
+
+    public function __construct( array $initial = [] ) {
+        $this->array = $initial;
+    }
+
+    public function set( string $id, $value ) {
+        if ($value === null ) {
+            $this->delete($id);
+        } else {
+            $this->array[ $id ] = $value;
+        }
+    }
+
+    public function delete( string $id ) {
+        unset($this->array[ $id ]);
+    }
+
+    public function has( $id ): bool {
+        return key_exists($id, $this->array);
+    }
+
+    public function get( $id ) {
+        if ( ! $this->has( $id ) ) {
+            throw new ElementNotExistsException(sprintf('Element %s not exists!', $id));
+        }
+
+        return $this->array[ $id ];
+    }
+
+    /**
+     * Return array that is used internally to save the data.
+     *
+     * @return array
+     */
+    public function get_array() {
+        return $this->array;
+    }
+}