Sha256: fe5397a7d557cc98e0989d1c55780763a65d032840af56f24194ddc116547658
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Size: 1.72 KB
Versions: 14
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Stored size: 1.72 KB
Contents
require File.join(File.dirname(__FILE__), "../../spec_helper")
include Nudge
describe IntSubtractInstruction do
it_should_behave_like "every Nudge Instruction"
before(:each) do
@context = Interpreter.new
@i1 = IntSubtractInstruction.new(@context)
end
describe "\#go" do
before(:each) do
@i1 = IntSubtractInstruction.new(@context)
@context.clear_stacks
@int1 = ValuePoint.new("int", 1)
end
describe "\#preconditions?" do
it "should check that there are enough parameters" do
10.times {@context.stacks[:int].push(@int1)}
@i1.preconditions?.should == true
end
it "should raise an error if the preconditions aren't met" do
@context.clear_stacks
lambda{@i1.preconditions?}.should raise_error(Instruction::NotEnoughStackItems)
end
it "should successfully run #go only if all preconditions are met" do
5.times {@context.stacks[:int].push(@int1)}
@i1.should_receive(:cleanup)
@i1.go
end
end
describe "\#derive" do
it "should pop all the arguments" do
2.times {@context.stacks[:int].push(@int1)}
@i1.stub!(:cleanup) # and do nothing
@i1.go
@context.stacks[:int].depth.should == 0
end
end
describe "\#cleanup" do
describe "should push the result" do
{[2,3] => -1, [-2,-4] => 2}.each do |inputs, expected|
params = inputs.inspect
it "should produce #{expected} given #{params}" do
inputs.each {|i| @context.stacks[:int].push(ValuePoint.new("int", i))}
@i1.go
@context.stacks[:int].peek.value.should == expected
end
end
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems