spec/lib/algebra/formula_spec.rb in dydx-0.0.4 vs spec/lib/algebra/formula_spec.rb in dydx-0.0.5

@@ -7,12 +7,12 @@
   let(:division)      { (:x / :y) }
   let(:exponentiation){ (:x ^ :y) }
   describe 'Calculate' do
     context 'With Fixnum' do
       let(:formula) { (:x + :y) }
-      it{ expect((formula + 0).to_s).to eq(formula.to_s) }
-      it{ expect((formula - 0).to_s).to eq(formula.to_s) }
+      it{ expect(formula + 0).to eq(formula + 0) }
+      it{ expect(formula - 0).to eq(formula - 0) }
       it{ expect((formula * 0).to_s).to eq('0') }
       it{ expect((formula * 1).to_s).to eq(formula.to_s) }
       it{ expect{(formula / 0).to_s}.to raise_error(ZeroDivisionError) }
       it{ expect(formula / 1).to eq(formula) }
       it{ expect((formula ^ 0).to_s).to eq('1') }
@@ -32,26 +32,31 @@
     it{ expect(addition.d(:x).to_s).to eq('1') }
     it{ expect(addition.d(:y).to_s).to eq('1') }
     it{ expect(addition.d(:z).to_s).to eq('0') }
 
     it{ expect(subtraction.d(:x).to_s).to eq('1') }
-    it{ expect(subtraction.d(:y).to_s).to eq('-1') }
+    it{ expect(subtraction.d(:y).to_s).to eq('( - 1 )') }
     it{ expect(subtraction.d(:z).to_s).to eq('0') }
 
     it{ expect(multiplication.d(:x)).to eq(:y) }
     it{ expect(multiplication.d(:y)).to eq(:x) }
     it{ expect(multiplication.d(:z).to_s).to eq('0') }
 
-    it{ expect(division.d(:x).to_s).to eq("( y ^ -1 )") }
-    it{ expect(division.d(:y).to_s).to eq('( ( - x ) / ( y ^ 2 ) )') }
+    it{ expect(division.d(:x).to_s).to eq("( 1 / y )") }
+    it{ expect(division.d(:y).to_s).to eq('( - ( x / ( y ^ 2 ) ) )') }
     it{ expect(division.d(:z).to_s).to eq('0') }
 
     it{ expect(exponentiation.d(:x).to_s).to eq('( y * ( x ^ ( y - 1 ) ) )') }
     it{ expect(exponentiation.d(:y).to_s).to eq('( ( x ^ y ) * log( x ) )') }
     it{ expect(exponentiation.d(:z).to_s).to eq('0') }
   end
 
   describe '#include?' do
     it{ expect(addition.include?(:x)).to be_true }
     it{ expect(addition.include?(:z)).to be_false }
+  end
+
+  describe '#openable?' do
+    it{ expect((1 + :x).openable?(_(1))).to be_true }
+    it{ expect((1 + :x).openable?(:z)).to be_false }
   end
 end
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