Tests for convert() and SymEngine()

Author: rajithv

spec/symengine_spec.rb

@@ -4,4 +4,19 @@
       expect(SymEngine.ascii_art).to_not be_empty
     end
   end
+
+  describe 'convert' do
+    subject { SymEngine::convert(Complex(2, 3)) }
+
+    it { is_expected.to be_a SymEngine::Complex }
+    its(:to_s) { is_expected.to eq '2 + 3*I' }
+  end
+
+  describe 'SymEngine()' do
+    subject { SymEngine(Rational('1/3')) }
+
+    it { is_expected.to be_a SymEngine::Rational }
+    its(:to_s) { is_expected.to eq '1/3' }
+  end
+
 end