First set of tests, argument unwrapping/injection

tests/CommandRegistryTest.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace NoccyLabs\React\CommandBus;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+
+#[CoversClass(CommandRegistry::class)]
+class CommandRegistryTest extends \PHPUnit\Framework\TestCase
+{
+
+    public function testAddingNewCommandEmitsEvent()
+    {
+        $count = 0;
+
+        $reg = new CommandRegistry();
+        $reg->on(CommandRegistry::EVENT_REGISTERED, function ($data) use (&$count){
+            $this->assertEquals('foo', $data);
+            $count++;
+        });
+        $reg->register('foo', function () {});
+        $reg->register('foo', function () {});
+
+        $this->assertEquals(1, $count);
+    }
+
+    public function testRemovingCommandEmitsEvent()
+    {
+        $count = 0;
+
+        $reg = new CommandRegistry();
+        $reg->on(CommandRegistry::EVENT_UNREGISTERED, function ($data) use (&$count){
+            $this->assertEquals('foo', $data);
+            $count++;
+        });
+        $reg->register('foo', function () {});
+        $reg->unregister('foo');
+        $reg->unregister('foo');
+
+        $this->assertEquals(1, $count);
+    }
+
+    public function testFindingCommands()
+    {
+        $cmda = function () {};
+        $cmdb = function () {};
+
+        $reg = new CommandRegistry();
+        $reg->register('a', $cmda);
+        $reg->register('b', $cmdb);
+
+        $this->assertEquals('a', $reg->find('a')?->getName());
+        $this->assertEquals('b', $reg->find('b')?->getName());
+    }
+
+    public function testGettingCommandNames()
+    {
+        $cmda = function () {};
+        $cmdb = function () {};
+
+        $reg = new CommandRegistry();
+        $reg->register('a', $cmda);
+        $reg->register('b', $cmdb);
+
+        $this->assertEquals(['a','b'], $reg->getNames());
+    }
+
+}