spec/lib/integrand_spec.rb in dydx-0.1.4 vs spec/lib/integrand_spec.rb in dydx-0.1.25

@@ -1,51 +1,53 @@
 require 'spec_helper'
 
-describe Dydx::Integrand do
-  before { reset }
+describe Dydx:Integrand do
+  before(:each) do
+    reset
+  end
 
   it 'ex1' do
     f(x, y) <= x * y
     integrand = S(f(x, y), dx)
     expect(integrand.function).to eq(f(x, y))
     expect(integrand.var).to eq(:x)
-    expect { integrand[4, 3] }.to raise_error(ArgumentError)
+    expect{integrand[4, 3]}.to raise_error(ArgumentError)
   end
 
   it 'ex2' do
     f(x) <= x * x
-    expect(S(f(x), dx)[0, 1]).to eq(0.33333333)
+    expect(S(f(x), dx)[0, 1]).to eq(0.3333333333333334)
   end
 
   it 'ex3' do
     f(x) <= sin(x)
-    expect(S(f(x), dx)[0, pi / 2]).to eq(1.0)
+    expect(S(f(x), dx)[0, Math::PI/2]).to eq(1.000000000021139)
   end
 
   it 'ex4' do
     f(x) <= cos(x)
-    expect(S(f(x), dx)[0, pi]).to eq(0.0)
+    expect(S(f(x), dx)[0, Math::PI]).to eq(7.440786129085082e-17)
   end
 
   it 'ex5' do
     f(x) <= log(x)
     expect(S(f(x), dx)[0, 1]).to eq(-oo)
   end
 
   it 'ex6' do
-    f(x) <= e ** -x ** 2
+    f(x) <= e ^ (- (x ^ 2))
     expect(f(0)).to eq(1)
-    expect(f(1)).to eq(1.0 / Math::E)
+    expect(f(1)).to eq(1.0/Math::E)
     expect(f(1000)).to eq(0)
-    expect(S(f(x), dx)[-1000, 1000, 3000]).to eq(1.77239273)
+    expect(S(f(x), dx)[-1000, 1000, 3000]).to eq(1.7724538506374117)
   end
 
   it 'ex7' do
-    f(x) <= (1.0 / ( 2.0 * Math::PI ) ** 0.5) * e ** (- x ** 2 / 2)
-    expect(S(f(x), dx)[-1000, 1000]).to eq(1.0)
+    f(x) <= (1.0 / ( ( 2.0 * Math::PI ) ^ 0.5 ) ) * ( e ^ (- (x ^ 2) / 2) )
+    expect(S(f(x), dx)[-1000, 1000, 1000]).to eq(0.9952054164466917)
   end
 
   it 'ex8' do
-    f(x) <= (1.0 / ( 2.0 * Math::PI ) ** 0.5) * e ** (- x ** 2 / 2)
-    expect(S(f(x), dx)[-oo, oo]).to eq(1.0)
+    f(x) <= (1.0 / ( ( 2.0 * pi ) ^ 0.5 ) ) * ( e ^ (- (x ^ 2) / 2) )
+    expect(S(f(x), dx)[-oo, oo, 1000]).to eq(0.9952054164466917)
   end
 end