test/math_test.rb in polynomials-0.1.2 vs test/math_test.rb in polynomials-0.1.4

@@ -1,65 +1,65 @@
 require 'test_helper'
 class TestMath < MiniTest::Unit::TestCase
-  def test_nulls_for_constant_functions
+  def test_roots_for_constant_functions
     polynomial = Polynomial.parse('5')
-    assert_equal Set[],polynomial.nulls
+    assert_equal Set[],polynomial.roots
   end
 
-  def test_nulls_for_linear_functions
+  def test_roots_for_linear_functions
     polynomial = Polynomial.parse('5x + 2')
-    assert_equal Set[-2.0/5.0],polynomial.nulls
+    assert_equal Set[-2.0/5.0],polynomial.roots
   end
 
-  def test_nulls_quadratic_functions
+  def test_roots_quadratic_functions
     polynomial = Polynomial.parse('3x^2 + 2x - 40')
     p = 2.0/3.0
     q = -40.0/3.0
     root = Math.sqrt((p/2)**2 - q)
     fraction = -(p/2)
-    assert_equal Set[(fraction - root).round(10), (fraction + root).round(10)],polynomial.nulls
+    assert_equal Set[(fraction - root).round(10), (fraction + root).round(10)],polynomial.roots
 
     polynomial = Polynomial.parse('3x^2 - 40')
-    assert_equal Set[Math.sqrt(40.0/3).round(10), -Math.sqrt(40.0/3).round(10)], polynomial.nulls
+    assert_equal Set[Math.sqrt(40.0/3).round(10), -Math.sqrt(40.0/3).round(10)], polynomial.roots
   end
 
-  def test_nulls_for_cubic_functions
+  def test_roots_for_cubic_functions
     polynomial = Polynomial.parse('1x^3  + 1x^2  + 2x - 1')
-    assert_equal(1, polynomial.nulls.size)
-    assert_equal Set[0.3926467817], polynomial.nulls
+    assert_equal(1, polynomial.roots.size)
+    assert_equal Set[0.3926467817], polynomial.roots
 
     polynomial = Polynomial.parse('2x^3  - 4x^2  - 22x + 24')
-    assert_equal Set[4.0,-3.0,1.0], polynomial.nulls
+    assert_equal Set[4.0,-3.0,1.0], polynomial.roots
   end
 
-  def test_nulls_for_cubic_functions_with_complex
+  def test_roots_for_cubic_functions_with_complex
     coefficients = Polynomial.parse('3x^3   - 10x^2   + 14x + 27').terms.first(4).map{ |t| t.last.coefficient }
     assert_equal Set[-1.0, Complex(2.1666666666666634,2.0749832663314605), Complex(2.1666666666666634,-2.0749832663314605)],Math.roots_of_cubic_function(*coefficients, true)
   end
 
-  def test_nulls_for_cubic_functions_one_real_all_equal
+  def test_roots_for_cubic_functions_one_real_all_equal
     polynomial = Polynomial.parse('1x^3   + 6x^2   + 12x + 8')
-    assert_equal(1, polynomial.nulls.size)
-    assert_equal(-2, polynomial.nulls.first)
+    assert_equal(1, polynomial.roots.size)
+    assert_equal(-2, polynomial.roots.first)
   end
 
-  def test_nulls_for_quartic_functions
+  def test_roots_for_quartic_functions
     polynomial = Polynomial.parse('3x^4   + 6x^3   - 123x^2   - 126x + 1080')
-    assert_equal Set[5.0, 3.0, -4.0, -6.0], polynomial.nulls
+    assert_equal Set[5.0, 3.0, -4.0, -6.0], polynomial.roots
 
     polynomial = Polynomial.parse('-20x^4   + 5x^3   + 17x^2   - 29x + 87')
-    assert_equal Set[-1.6820039266,1.4875831103], polynomial.nulls
+    assert_equal Set[-1.6820039266,1.4875831103], polynomial.roots
   end
 
-  def test_nulls_without_term_with_exponent_of_zero
+  def test_roots_without_term_with_exponent_of_zero
     polynomial = Polynomial.parse('3x^3 + 3x^2')
-    assert_equal Set[0.0,-1.0], polynomial.nulls
+    assert_equal Set[0.0,-1.0], polynomial.roots
 
     polynomial = Polynomial.parse('1 x^4')
-    assert_equal Set[0.0], polynomial.nulls
+    assert_equal Set[0.0], polynomial.roots
   end
 
-  def test_nulls_biquadratic_equation
+  def test_roots_biquadratic_equation
     polynomial = Polynomial.parse('4x^4 + 2x^2 - 1')
-    assert_equal Set[0.5558929703, -0.5558929703], polynomial.nulls
+    assert_equal Set[0.5558929703, -0.5558929703], polynomial.roots
   end
 end