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Versions: 8
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Stored size: 1.61 KB
Contents
require File.join(File.dirname(__FILE__), "../../spec_helper")
include Nudge
describe NameSwapInstruction do
it_should_behave_like "every Nudge Instruction"
before(:each) do
@context = Interpreter.new
@i1 = NameSwapInstruction.new(@context)
end
describe "\#go" do
before(:each) do
@i1 = NameSwapInstruction.new(@context)
@name1 = ReferencePoint.new("name1")
end
describe "\#preconditions?" do
it "should check that there are enough parameters" do
2.times {@context.stacks[:name].push(@name1)}
@i1.preconditions?.should == true
end
it "should raise an error if the preconditions aren't met" do
@context.clear_stacks # there are no params at all
lambda{@i1.preconditions?}.should raise_error(Instruction::NotEnoughStackItems)
end
it "should successfully run #go only if all preconditions are met" do
3.times {@context.stacks[:name].push(@name1)}
@i1.should_receive(:cleanup)
@i1.go
end
end
describe "\#derive" do
it "should pop all the arguments" do
2.times {@context.stacks[:name].push(@name1)}
@i1.stub!(:cleanup) # and do nothing
@i1.go
@context.stacks[:name].depth.should == 0
end
end
describe "\#cleanup" do
it "should swap the top two values" do
@context.stacks[:name].push ReferencePoint.new("x")
@context.stacks[:name].push ReferencePoint.new("y")
@i1.go
@context.pop_value(:name).should == "x"
@context.pop_value(:name).should == "y"
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems