test/polynomial_test.rb in polynomials-0.1.6 vs test/polynomial_test.rb in polynomials-0.1.7

@@ -65,9 +65,14 @@
 
     polynomial = Polynomial.parse('5x^2')
     assert_equal({ left: Set[-1.0/0..+1.0/0] }, polynomial.curvature_behaviour)
   end
 
+  def test_no_extremums
+    polynomial = Polynomial.parse('5')
+    assert_equal({}, polynomial.extrema)
+  end
+
   def test_no_curve_and_no_inflection_points
     polynomials = []
     polynomials << Polynomial.parse('5 x + 4')
     polynomials << Polynomial.parse('4')
     polynomials.each do |polynomial|