chore(core): setup fixes (#749)

Author: brendt

src/Tempest/Core/src/Composer.php

@@ -39,10 +39,6 @@ public function __construct(
         if (! isset($this->mainNamespace) && count($this->namespaces)) {
             $this->mainNamespace = $this->namespaces[0];
         }
-
-        if (! isset($this->mainNamespace)) {
-            throw new KernelException("Tempest requires at least one PSR-4 namespace to be defined in composer.json.");
-        }
     }
 
     public function setMainNamespace(ComposerNamespace $namespace): self

src/Tempest/Core/src/Environment.php

@@ -47,7 +47,7 @@ public function isOther(): bool
 
     public static function fromEnv(): self
     {
-        $value = env('ENVIRONMENT', 'production');
+        $value = env('ENVIRONMENT', 'local');
 
         return self::tryFrom($value) ?? throw new InvalidEnvironment($value);
     }

src/Tempest/Core/src/Kernel.php

@@ -186,7 +186,7 @@ private function registerKernelErrorHandler(): self
             $handler = new HttpProductionErrorHandler();
             set_exception_handler($handler->handleException(...));
             set_error_handler($handler->handleError(...)); // @phpstan-ignore-line
-        } else {
+        } elseif (PHP_SAPI !== 'cli') {
             $whoops = new Run();
             $whoops->pushHandler(new PrettyPageHandler());
             $whoops->register();

tests/Integration/Core/ComposerTest.php

@@ -92,13 +92,6 @@ public function takes_src_namespace_in_priority(): void
         $this->assertSame('src/', $composer->mainNamespace->path);
     }
 
-    #[Test]
-    public function errors_without_namespace(): void
-    {
-        $this->expectException(KernelException::class);
-        $this->initializeComposer([]);
-    }
-
     #[Test]
     public function errors_without_composer_file(): void
     {