Prefer command handlers to not throw exceptions

.gitignore

@@ -1,3 +1,4 @@
 vendor/
 build/
 .idea/
+.phpunit.result.cache

contracts/Handler.php

@@ -2,16 +2,13 @@
 
 namespace Stratadox\CommandHandling;
 
-use Throwable;
-
 interface Handler
 {
     /**
      * Handles an inputted command, either performing an action or throwing an
      * exception.
      *
      * @param object $command The command to handle.
-     * @throws Throwable      When the command is denied.
      */
     public function handle(object $command): void;
 }

src/OnExceptionCases.php

@@ -40,7 +40,6 @@ public function handle(object $command): void
             $this->handler->handle($command);
         } catch (Throwable $exception) {
             $this->middleware->invoke($command, $exception);
-            throw $exception;
         }
     }
 }

tests/InvokingMiddlewareInExceptionCases.php

@@ -30,13 +30,8 @@ function invoking_the_middleware_for_rejected_commands()
             AlwaysFailingCommand::class => new AlwaysThrowingHandler(),
         ]));
 
-        try {
-            $input->handle(new AlwaysFailingCommand());
+        $input->handle(new AlwaysFailingCommand());
 
-            $this->fail('Expecting an exception while handling the command.');
-        } catch (Throwable $exception) {
-            $this->assertInstanceOf(CommandDenied::class, $exception);
-        }
         $this->assertInstanceOf(
             AlwaysFailingCommand::class,
             $middleware->observedCommand()
@@ -77,7 +72,7 @@ function invoking_the_middleware_for_specific_commands_only()
         try {
             $input->handle(new AlwaysFailingCommand());
 
-            $this->fail('Expecting an exception while handling the command.');
+            $this->fail('Exceptions should not be caught by default.');
         } catch (Throwable $exception) {
             $this->assertInstanceOf(CommandDenied::class, $exception);
         }