Revert "Delete test_scaffold.py"

This reverts commit de9e87f.

Author: EwoutH

tests/test_scaffold.py

@@ -0,0 +1,21 @@
+# noqa: D100
+import os
+import unittest
+
+from click.testing import CliRunner
+
+from mesa.main import cli
+
+
+class ScaffoldTest(unittest.TestCase):
+    """Test mesa project scaffolding command."""
+
+    @classmethod
+    def setUpClass(cls):  # noqa: D102
+        cls.runner = CliRunner()
+
+    def test_scaffold_creates_project_dir(self):  # noqa: D102
+        with self.runner.isolated_filesystem():
+            assert not os.path.isdir("example_project")
+            self.runner.invoke(cli, ["startproject", "--no-input"])
+            assert os.path.isdir("example_project")