Add interfaces for easier testing capabilities

src/Collections/MessageCollection.php

@@ -3,26 +3,27 @@
 namespace DirectoryTree\ImapEngine\Collections;
 
 use DirectoryTree\ImapEngine\Message;
+use DirectoryTree\ImapEngine\MessageInterface;
 
 class MessageCollection extends PaginatedCollection
 {
     /**
      * Find a message by its UID.
      */
-    public function find(int $uid): ?Message
+    public function find(int $uid): ?MessageInterface
     {
         return $this->first(
-            fn (Message $message) => $message->uid() === $uid
+            fn (MessageInterface $message) => $message->uid() === $uid
         );
     }
 
     /**
      * Find a message by its UID or throw an exception.
      */
-    public function findOrFail(int $uid): Message
+    public function findOrFail(int $uid): MessageInterface
     {
         return $this->firstOrFail(
-            fn (Message $message) => $message->uid() === $uid
+            fn (MessageInterface $message) => $message->uid() === $uid
         );
     }
 }

src/FileMessage.php

@@ -2,6 +2,8 @@
 
 namespace DirectoryTree\ImapEngine;
 
+use BadMethodCallException;
+
 class FileMessage implements MessageInterface
 {
     use HasParsedMessage;
@@ -13,6 +15,14 @@ public function __construct(
         protected string $contents
     ) {}
 
+    /**
+     * {@inheritDoc}
+     */
+    public function uid(): int
+    {
+        throw new BadMethodCallException('FileMessage does not support a UID');
+    }
+
     /**
      * Get the string representation of the message.
      */

src/Folder.php

@@ -11,7 +11,7 @@
 use Illuminate\Support\ItemNotFoundException;
 use JsonSerializable;
 
-class Folder implements Arrayable, JsonSerializable
+class Folder implements Arrayable, FolderInterface, JsonSerializable
 {
     /**
      * The folder's cached capabilities.
@@ -55,33 +55,33 @@ public function flags(): array
     }
 
     /**
-     * Get the folder delimiter.
+     * {@inheritDoc}
      */
     public function delimiter(): string
     {
         return $this->delimiter;
     }
 
     /**
-     * Get the folder name.
+     * {@inheritDoc}
      */
     public function name(): string
     {
         return last(explode($this->delimiter, $this->path));
     }
 
     /**
-     * Determine if the folder is the same as the given folder.
+     * {@inheritDoc}
      */
-    public function is(Folder $folder): bool
+    public function is(FolderInterface $folder): bool
     {
-        return $this->path === $folder->path
-            && $this->mailbox->config('host') === $folder->mailbox->config('host')
-            && $this->mailbox->config('username') === $folder->mailbox->config('username');
+        return $this->path === $folder->path()
+            && $this->mailbox->config('host') === $folder->mailbox()->config('host')
+            && $this->mailbox->config('username') === $folder->mailbox()->config('username');
     }
 
     /**
-     * Begin querying for messages.
+     * {@inheritDoc}
      */
     public function messages(): MessageQuery
     {
@@ -92,7 +92,7 @@ public function messages(): MessageQuery
     }
 
     /**
-     * Begin idling on the current folder.
+     * {@inheritDoc}
      */
     public function idle(callable $callback, ?callable $query = null, int $timeout = 300): void
     {
@@ -134,7 +134,7 @@ function (int $msgn) use ($callback, $fetch) {
     }
 
     /**
-     * Move or rename the current folder.
+     * {@inheritDoc}
      */
     public function move(string $newPath): void
     {
@@ -144,15 +144,15 @@ public function move(string $newPath): void
     }
 
     /**
-     * Select the current folder.
+     * {@inheritDoc}
      */
     public function select(bool $force = false): void
     {
         $this->mailbox->select($this, $force);
     }
 
     /**
-     * Get the folder's status.
+     * {@inheritDoc}
      */
     public function status(): array
     {
@@ -171,7 +171,7 @@ public function status(): array
     }
 
     /**
-     * Examine the current folder and get detailed status information.
+     * {@inheritDoc}
      */
     public function examine(): array
     {
@@ -181,7 +181,7 @@ public function examine(): array
     }
 
     /**
-     * Expunge the mailbox and return the expunged message sequence numbers.
+     * {@inheritDoc}
      */
     public function expunge(): array
     {
@@ -191,7 +191,7 @@ public function expunge(): array
     }
 
     /**
-     * Delete the current folder.
+     * {@inheritDoc}
      */
     public function delete(): void
     {

src/FolderInterface.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace DirectoryTree\ImapEngine;
+
+interface FolderInterface
+{
+    /**
+     * Get the folder's mailbox.
+     */
+    public function mailbox(): MailboxInterface;
+
+    /**
+     * Get the folder path.
+     */
+    public function path(): string;
+
+    /**
+     * Get the folder flags.
+     *
+     * @return string[]
+     */
+    public function flags(): array;
+
+    /**
+     * Get the folder delimiter.
+     */
+    public function delimiter(): string;
+
+    /**
+     * Get the folder name.
+     */
+    public function name(): string;
+
+    /**
+     * Determine if the current folder is the same as the given.
+     */
+    public function is(FolderInterface $folder): bool;
+
+    /**
+     * Begin querying for messages.
+     */
+    public function messages(): MessageQuery;
+
+    /**
+     * Begin idling on the current folder.
+     */
+    public function idle(callable $callback, ?callable $query = null, int $timeout = 300): void;
+
+    /**
+     * Move or rename the current folder.
+     */
+    public function move(string $newPath): void;
+
+    /**
+     * Select the current folder.
+     */
+    public function select(bool $force = false): void;
+
+    /**
+     * Get the folder's status.
+     */
+    public function status(): array;
+
+    /**
+     * Examine the current folder and get detailed status information.
+     */
+    public function examine(): array;
+
+    /**
+     * Expunge the mailbox and return the expunged message sequence numbers.
+     */
+    public function expunge(): array;
+
+    /**
+     * Delete the current folder.
+     */
+    public function delete(): void;
+}

src/FolderRepository.php

@@ -5,7 +5,7 @@
 use DirectoryTree\ImapEngine\Collections\FolderCollection;
 use DirectoryTree\ImapEngine\Connection\Responses\UntaggedResponse;
 
-class FolderRepository
+class FolderRepository implements FolderRepositoryInterface
 {
     /**
      * Constructor.
@@ -15,41 +15,41 @@ public function __construct(
     ) {}
 
     /**
-     * Find a folder.
+     * {@inheritDoc}
      */
-    public function find(string $folder): ?Folder
+    public function find(string $folder): ?FolderInterface
     {
         return $this->get($folder)->first();
     }
 
     /**
-     * Find a folder or throw an exception.
+     * {@inheritDoc}
      */
-    public function findOrFail(string $folder): Folder
+    public function findOrFail(string $folder): FolderInterface
     {
         return $this->get($folder)->firstOrFail();
     }
 
     /**
-     * Create a new folder.
+     * {@inheritDoc}
      */
-    public function create(string $folder): Folder
+    public function create(string $folder): FolderInterface
     {
         $this->mailbox->connection()->create($folder);
 
         return $this->find($folder);
     }
 
     /**
-     * Find or create a folder.
+     * {@inheritDoc}
      */
-    public function firstOrCreate(string $folder): Folder
+    public function firstOrCreate(string $folder): FolderInterface
     {
         return $this->find($folder) ?? $this->create($folder);
     }
 
     /**
-     * Get the mailboxes folders.
+     * {@inheritDoc}
      */
     public function get(?string $match = '*', ?string $reference = ''): FolderCollection
     {

src/FolderRepositoryInterface.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace DirectoryTree\ImapEngine;
+
+use DirectoryTree\ImapEngine\Collections\FolderCollection;
+
+interface FolderRepositoryInterface
+{
+    /**
+     * Find a folder.
+     */
+    public function find(string $folder): ?FolderInterface;
+
+    /**
+     * Find a folder or throw an exception.
+     */
+    public function findOrFail(string $folder): FolderInterface;
+
+    /**
+     * Create a new folder.
+     */
+    public function create(string $folder): FolderInterface;
+
+    /**
+     * Find or create a folder.
+     */
+    public function firstOrCreate(string $folder): FolderInterface;
+
+    /**
+     * Get the mailboxes folders.
+     */
+    public function get(?string $match = '*', ?string $reference = ''): FolderCollection;
+}