test/polynomial_test.rb in polynomials-0.4.3 vs test/polynomial_test.rb in polynomials-0.4.4

@@ -93,6 +93,12 @@
 
   def test_calculation_of_function_with_absolute_term_linear
     polynomial = Polynomial.parse('5x + 2')
     assert_equal 7, polynomial.(1)
   end
+
+  def test_constant_zero_polynomial
+    constant_function = Polynomial.new(0)
+    assert_equal Set[], constant_function.roots
+    assert_equal nil, constant_function.curvature_behaviour
+  end
 end