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Contents
require 'minitest/autorun'
require 'geometry/transformation/composition'
describe Geometry::Transformation::Composition do
Composition = Geometry::Transformation::Composition
Transformation = Geometry::Transformation
subject { Composition.new }
describe "when constructed" do
it "must accept multiple transformations" do
composition = Composition.new(Transformation.new, Transformation.new)
composition.size.must_equal 2
end
it "must reject anything that isn't a Transformation" do
-> { Composition.new :foo }.must_raise TypeError
end
end
describe "attributes" do
describe "has_rotation?" do
it "must properly be true" do
Composition.new(Transformation.new angle:90).has_rotation?.must_equal true
end
it "must properly be false" do
subject.has_rotation?.must_equal false
end
end
end
describe "when composing" do
it "must append a Transformation" do
(Composition.new(Transformation.new) + Transformation.new).size.must_equal 2
end
it "must merge with a Composition" do
(Composition.new(Transformation.new) + Composition.new(Transformation.new)).size.must_equal 2
end
end
describe "when transforming a Point" do
it "must handle composed translations" do
composition = Composition.new(Transformation.new origin:[1,2]) + Composition.new(Transformation.new [3,4])
composition.transform(Point[5,6]).must_equal Point[9, 12]
end
end
end
Version data entries
15 entries across 15 versions & 3 rubygems