require "spec" require "../src/*" describe "React" do it "input cells have a value" do input = React::InputCell.new(10) input.value.should eq(10) end pending "an input cell's value can be set" do input = React::InputCell.new(4) input.value = 20 input.value.should eq(20) end pending "compute cells calculate initial value" do input = React::InputCell.new(1) output = React::ComputeCell.new(input) { |input1| input1 + 1 } output.value.should eq(2) end pending "compute cells take inputs in the right order" do one = React::InputCell.new(1) two = React::InputCell.new(2) output = React::ComputeCell.new(one, two) { |input1, input2| input1 + input2 * 10 } output.value.should eq(21) end pending "compute cells update value when dependencies are changed" do input = React::InputCell.new(1) output = React::ComputeCell.new(input) { |input1| input1 + 1 } input.value = 3 output.value.should eq(4) end pending "compute cells can depend on other compute cells" do input = React::InputCell.new(1) times_two = React::ComputeCell.new(input) { |input1| input1 * 2 } times_thirty = React::ComputeCell.new(input) { |input1| input1 * 30 } output = React::ComputeCell.new(times_two, times_thirty) { |input1, input2| input1 + input2 } output.value.should eq(32) input.value = 3 output.value.should eq(96) end pending "compute cells fire callbacks" do value1 = [] of Int32 input = React::InputCell.new(1) output = React::ComputeCell.new(input) { |input1| input1 + 1 } callback1 = output.add_callback { |value| value1 << value } input.value = 3 value1[-1].should eq 4 end pending "callback cells only fire on change" do value1 = [] of Int32 input = React::InputCell.new(1) output = React::ComputeCell.new(input) { |input1| input1 < 3 ? 111 : 222 } callback1 = output.add_callback { |value| value1 << value } input.value = 2 value1.should eq [] of Int32 input.value = 4 value1[-1].should eq 222 end pending "callbacks do not report already reported values" do value1 = [] of Int32 input = React::InputCell.new(1) output = React::ComputeCell.new(input) { |input1| input1 + 1 } callback1 = output.add_callback { |value| value1 << value } input.value = 2 value1[-1].should eq 3 input.value = 3 value1[-1].should eq 4 end pending "callbacks can fire from multiple cells" do value1 = [] of Int32 value2 = [] of Int32 input = React::InputCell.new(1) plus_one = React::ComputeCell.new(input) { |input1| input1 + 1 } minus_one = React::ComputeCell.new(input) { |input1| input1 - 1 } callback1 = plus_one.add_callback { |value| value1 << value } callback2 = minus_one.add_callback { |value| value2 << value } input.value = 10 value1[-1].should eq 11 value2[-1].should eq 9 end pending "callbacks can be added and removed" do value1 = [] of Int32 value2 = [] of Int32 value3 = [] of Int32 input = React::InputCell.new(11) output = React::ComputeCell.new(input) { |input1| input1 + 1 } callback1 = output.add_callback { |value| value1 << value } callback2 = output.add_callback { |value| value2 << value } input.value = 31 value1[-1].should eq 32 value2[-1].should eq 32 output.remove_callback(callback1) callback3 = output.add_callback { |value| value3 << value } input.value = 41 value2[-1].should eq 42 value3[-1].should eq 42 value1.size.should eq 1 end pending "removing a callback multiple times doesn't interfere with other callbacks" do value1 = [] of Int32 value2 = [] of Int32 input = React::InputCell.new(1) output = React::ComputeCell.new(input) { |input1| input1 + 1 } callback1 = output.add_callback { |value| value1 << value } callback2 = output.add_callback { |value| value2 << value } output.remove_callback(callback1) output.remove_callback(callback1) output.remove_callback(callback1) input.value = 2 value2[-1].should eq 3 value1.should eq [] of Int32 end pending "callbacks should only be called once even if multiple dependencies change" do value1 = [] of Int32 input = React::InputCell.new(1) plus_one = React::ComputeCell.new(input) { |input1| input1 + 1 } minus_one1 = React::ComputeCell.new(input) { |input1| input1 - 1 } minus_one2 = React::ComputeCell.new(minus_one1) { |input1| input1 - 1 } output = React::ComputeCell.new(plus_one, minus_one2) { |input1, input2| input1 * input2 } callback1 = output.add_callback { |value| value1 << value } input.value = 4 value1[-1].should eq 10 end pending "callbacks should not be called if dependencies change but output value doesn't change" do value1 = [] of Int32 input = React::InputCell.new(1) plus_one = React::ComputeCell.new(input) { |input1| input1 + 1 } minus_one = React::ComputeCell.new(input) { |input1| input1 - 1 } always_two = React::ComputeCell.new(plus_one, minus_one) { |input1, input2| input1 - input2 } callback1 = always_two.add_callback { |value| value1 << value } input.value = 2 value1.should eq [] of Int32 input.value = 3 value1.should eq [] of Int32 input.value = 4 value1.should eq [] of Int32 input.value = 5 value1.should eq [] of Int32 end end