require File.dirname(__FILE__) + '/spec_helper.rb'
require 'fault_injection.rb'

include FaultInjection

describe FaultConditionLine do
  it "raise if invalid arguments are specified" do
	Proc.new{
	  FaultConditionLine.new({:file=>'foo.rb', :line=>-5})
	}.should raise_error(ArgumentError)
  end

  it "implements attr_accessors" do
	c = FaultConditionLine.new("foo.rb",300)
	c.file.should be_eql("foo.rb")
	c.line.should be_eql(300)
  end

  it "matches file name and line numbers" do
	c = FaultConditionLine.new("foo.rb",300)
	c.should_raise_on("foo.rb",300).should be_true
	c.should_raise_on("foo.rb",305).should_not be_true
	c.should_raise_on("bar.rb",300).should_not be_true
	c.should_raise_on("bar.rb",199).should_not be_true

	c.should_raise_on("dir/foo.rb",300).should be_true
	c.should_raise_on("dir/bar.rb",300).should_not be_true
	c.should_raise_on("dir/foo.rb",390).should_not be_true

	c.should_raise_on(caller).should_not be_true
  end

  it "can inject a fault with probability" do
	c = FaultConditionLine.new("foo.rb",99)
	c.probability = 0.5
	
	try_count = 3000
	raise_count = 0
	try_count.times { raise_count += 1 if c.should_raise_on('foo.rb',99) }
	
	probab = raise_count.to_f / try_count
	probab.should be_close(0.5,0.05)
	
	c.should_raise_on('bar.rb',99).should_not be_true
  end
  
  it "can inject a fault with count limit." do
	c = FaultConditionLine.new('foo.rb',99)
	c.limit_times = 5

	5.times do
	  c.should_raise_on('foo.rb',99).should be_true
	  c.should_raise_on('foo.rb',100).should_not be_true
	end

	c.limit_times.should be_eql(0)
	c.should_raise_on('foo.rb',99).should_not be_true
	c.should_raise_on('foo.rb',100).should_not be_true
  end

  it "can inject a fault with both count limit and probability" do
	try_count = 3000
	
	c = FaultConditionLine.new("foo.rb",99)
	c.probability = 0.5
	c.limit_times = try_count

	raise_count = 0
	all_count   = 0
	while raise_count < try_count
	  all_count += 1
	  raise_count += 1 if c.should_raise_on('foo.rb',99)
	end
	
	probab = raise_count.to_f / all_count
	probab.should be_close(0.5,0.05)

	c.limit_times.should be_eql(0)
	c.should_raise_on('foo.rb',99).should_not be_true	
  end
end