spec/straightedge_spec.rb in straightedge-0.1.0 vs spec/straightedge_spec.rb in straightedge-0.1.1

@@ -3,6 +3,41 @@
 
 describe Straightedge do
   it "should have a VERSION constant" do
     subject.const_get('VERSION').should_not be_empty
   end
+
+  context "contracts" do
+
+    context "example scene" do
+      let(:scene) { Director.new.current_scene }
+      it "should be constructed without issues" do
+	expect { scene.render }.not_to raise_error
+      end
+
+    end
+
+    context "classical constructions" do
+=begin
+    the classical straightedge and compass constructions: 
+
+      - Creating the line through two existing points
+      - Creating the circle through one point with centre another point
+      - Creating the point which is the intersection of two existing, non-parallel lines
+      - Creating the one or two points in the intersection of a line and a circle (if they intersect)
+      - Creating the one or two points in the intersection of two circles (if they intersect).
+=end
+
+      describe "creating a line between two points" do
+	let(:a) { [0,4] }
+	let(:b) { [3,0] }
+
+	let(:line) { Line.new([a,b]) }
+
+	it 'should have length 5' do
+	  expect(line.length).to eql(5.0)
+	end
+      end
+    end
+  end
 end
+