feat: Add tests to confirm functionality

tests/integration/test_cli_group.py

@@ -0,0 +1,31 @@
+from click.testing import CliRunner
+
+from dbt_meshify.cli import get_version
+from dbt_meshify.main import cli
+
+
+def test_version_option():
+    """When the --version option is passed, meshify returns the version and exits."""
+
+    runner = CliRunner()
+    result = runner.invoke(
+        cli,
+        [
+            "--version",
+        ],
+    )
+
+    assert result.exit_code == 0
+    assert result.stdout.rstrip() == get_version()
+
+
+def test_no_command_prints_help():
+    """When an invoked subcommand is not provided, print the help and exit."""
+
+    runner = CliRunner()
+    result = runner.invoke(cli)
+
+    assert result.exit_code == 0
+
+    help_result = result = runner.invoke(cli, ["--help"])
+    assert result.stdout == help_result.stdout