Include test of multi-line seval

pysr/test/test.py

@@ -99,6 +99,19 @@ class TestPipeline(unittest.TestCase):
         # Test options stored:
         self.assertEqual(model.julia_options_.turbo, True)
 
+    def test_multiline_seval(self):
+        if jl.seval('VERSION >= v"1.9"'):
+            # The user should be able to run multiple things in a single seval call:
+            num = jl.seval(
+                """
+                function my_new_objective(x)
+                    x^2
+                end
+                1.5
+            """
+            )
+            self.assertEqual(num, 1.5)
+
     def test_high_precision_search_custom_loss(self):
         y = 1.23456789 * self.X[:, 0]
         model = PySRRegressor(