added exception test

tests/test_exception.py

@@ -0,0 +1,27 @@
+from masonite.app import App
+from masonite.view import View
+from masonite.exception_handler import ExceptionHandler
+import pytest
+from masonite.exceptions import MissingContainerBindingNotFound
+
+class ApplicationMock:
+    DEBUG = True
+
+class StorageMock:
+    STATICFILES = {}
+
+container = App()
+container.bind('Application', ApplicationMock)
+container.bind('View', View(container).render)
+container.bind('Storage', StorageMock)
+container.bind('ExceptionHandler', ExceptionHandler(container))
+
+def test_exception_renders_view():
+    with pytest.raises(MissingContainerBindingNotFound):
+        assert container.make('ExceptionHandler').load_exception(KeyError)
+
+
+def test_exception_raises_exception():
+    container.make('Application').DEBUG = False
+    with pytest.raises(KeyError):
+        assert container.make('ExceptionHandler').load_exception(KeyError)