Tests for lambdify

spec/lambdify_spec.rb

@@ -0,0 +1,38 @@
+describe 'SymEngine::lambdify' do
+
+  let(:x) { SymEngine::Symbol.new('x') }
+  let(:y) { SymEngine::Symbol.new('y') }
+  let(:z) { SymEngine::Symbol.new('z') }
+
+  describe 'lambda for Addition' do
+    let(:func) { x + y + z }
+    let(:lamb) { SymEngine::lambdify(func) }
+    it 'performs addition with a lambda function' do
+      expect(lamb.call(1, 1, 1)).to eq(3)
+      expect(lamb.call(1, -1, 1)).to eq(1)
+      expect(lamb.call(-1, -1, -1)).to eq(-3)
+    end
+  end
+
+  describe 'lambda for Addition with FixNums' do
+    let(:func) { x + 5}
+    let(:lamb) { SymEngine::lambdify(func) }
+    it 'performs addition with a lambda function' do
+      expect(lamb.call(1)).to eq(6)
+      expect(lamb.call(0)).to eq(5)
+      expect(lamb.call(-1)).to eq(4)
+      expect(lamb.call(Math::PI)).to be_within(0.000000000000001).of(8.141592653589793)
+    end
+  end
+
+  describe 'lambda for sin' do
+    let(:func) { SymEngine::sin(x) }
+    let(:lamb) { SymEngine::lambdify(func) }
+    it 'performs sin calculation with a lambda function' do
+      expect(lamb.call(0)).to be_within(0.000000000000001).of(0.0)
+      expect(lamb.call(Math::PI)).to be_within(0.000000000000001).of(0.0)
+      expect(lamb.call(Math::PI/2)).to be_within(0.000000000000001).of(1.0)
+    end
+  end
+
+end