added a simple test for sql_shell

Author: dantownsend

tests/apps/sql_shell/__init__.py

@@ -0,0 +1,14 @@
+from unittest import TestCase
+from unittest.mock import patch, MagicMock
+
+from piccolo.apps.sql_shell.commands.run import run
+
+
+class TestRun(TestCase):
+    @patch("piccolo.apps.sql_shell.commands.run.subprocess")
+    def test_run(self, subprocess: MagicMock):
+        """
+        A simple test to make sure it executes without raising any exceptions.
+        """
+        run()
+        self.assertTrue(subprocess.run.called)