Add UserMerge command

src/Model/Command/UserMerge.php

@@ -0,0 +1,50 @@
+<?php declare(strict_types=1);
+
+namespace Lmc\Matej\Model\Command;
+
+/**
+ * Take all interactions from the source user and merge them to the target user.
+ * Source user will be DELETED and unknown to Matej from this action.
+ */
+class UserMerge extends AbstractCommand
+{
+    /** @var string */
+    private $sourceUserId;
+    /** @var string */
+    private $targetUserId;
+
+    private function __construct(string $targetUserId, string $sourceUserId)
+    {
+        $this->targetUserId = $targetUserId;
+        $this->sourceUserId = $sourceUserId;
+    }
+
+    /**
+     * Merge source user into target user AND DELETE SOURCE USER.
+     */
+    public static function mergeInto(string $targetUserId, string $sourceUserIdToBeDeleted): self
+    {
+        return new static($targetUserId, $sourceUserIdToBeDeleted);
+    }
+
+    /**
+     * Merge source user into target user AND DELETE SOURCE USER.
+     */
+    public static function mergeFromSourceToTargetUser(string $sourceUserIdToBeDeleted, string $targetUserId): self
+    {
+        return new static($targetUserId, $sourceUserIdToBeDeleted);
+    }
+
+    public function getCommandType(): string
+    {
+        return 'user-merge';
+    }
+
+    public function getCommandParameters(): array
+    {
+        return [
+            'target_user_id' => $this->targetUserId,
+            'source_user_id' => $this->sourceUserId,
+        ];
+    }
+}

tests/Model/Command/UserMergeTest.php

@@ -0,0 +1,40 @@
+<?php declare(strict_types=1);
+
+namespace Lmc\Matej\Model\Command;
+
+use Lmc\Matej\TestCase;
+
+class UserMergeTest extends TestCase
+{
+    /** @test */
+    public function shouldGenerateCorrectSignature(): void
+    {
+        $sourceUserId = 'source-user';
+        $targetUserId = 'target-user';
+
+        $command = UserMerge::mergeInto($targetUserId, $sourceUserId);
+        $this->assertUserMergeObject($command, $sourceUserId, $targetUserId);
+
+        $command = UserMerge::mergeFromSourceToTargetUser($sourceUserId, $targetUserId);
+        $this->assertUserMergeObject($command, $sourceUserId, $targetUserId);
+    }
+
+    /**
+     * Execute asserts against user merge object
+     * @param object $object
+     */
+    private function assertUserMergeObject($object, string $sourceUserId, string $targetUserId): void
+    {
+        $this->assertInstanceOf(UserMerge::class, $object);
+        $this->assertSame(
+            [
+                'type' => 'user-merge',
+                'parameters' => [
+                    'target_user_id' => $targetUserId,
+                    'source_user_id' => $sourceUserId,
+                ],
+            ],
+            $object->jsonSerialize()
+        );
+    }
+}