Python test for multiline

tests_dir/multiline_optimization.py

@@ -0,0 +1,8 @@
+from relational.optimizer import optimize_program
+
+a = optimize_program('''ppl_skills = people ⧓skills
+ppl_skills1 = ppl_skills ∪ (people ⧓skills)
+ppl_skills ∩ ppl_skills1 ⧓ dates''', {})
+
+assert a == '''optm_a = people⧓skills
+optm_b = optm_a⧓dates'''