code: def test_equals_rule():
      rule = "a == a"
      assert_equal(rule, str(Rule(rule)))
  
      rule2 = "a == a and a == a"
      assert_equal(rule, str(Rule(rule2)))
  
      rule3 = "a < 3.0 and a == a"
      assert_equal(rule3, str(Rule(rule3)))
  
imports: from sklearn.utils.testing import assert_equal, assert_not_equal
  from skrules import Rule, replace_feature_name
label_desc: Use image node_id 4 for calling a global function with example usage: test_equals_rule() without return types