g_stack_spec.rb

# jruby -S rspec -fs spec/g_stack_spec.rb

require 'java'
import 'cis.GStack'
import 'cis.StackException'

describe GStack, 'once created' do

  # create a GStack
  before(:each) do
    @stack = GStack.new
  end

  # public boolean isEmpty()
  it 'should be empty' do
    @stack.should be_empty
  end

  # public void push(T newItem)
  it 'should accept an item with push' do
    %w{foo bar baz}.each {|s| @stack.push(s)}
    @stack.should_not be_empty
  end

  # public void push(T newItem) throws StackException
  it 'should raise an error on push'

  # public void popAll()
  it 'should clear the stack' do
    %w{foo bar baz}.each {|s| @stack.push(s)}
    @stack.pop_all
    @stack.should be_empty
  end

  # public T pop()
  it 'should pop off top item' do
    %w{foo bar baz}.each {|s| @stack.push(s)}
    @stack.pop.should eq "baz" 
    @stack.to_string.should eq "[foo, bar]"
  end

  # public T pop() throws StackException
  it 'should throw a StackException on pop when empty' do
    expect { @stack.pop }.to raise_error(StackException)
  end

  # public T peek()
  it 'should peek at top item' do
    %w{foo bar baz}.each {|s| @stack.push(s)}
    @stack.peek.should eq "baz" 
    @stack.to_string.should eq "[foo, bar, baz]"
  end

  # public T peek() throws StackException
  it 'should throw a StackException on peek when empty' do
    expect { @stack.peek }.to raise_error(StackException)
  end

  # public String toString()
  it 'should print something useful' do
    %w{foo bar baz}.each {|s| @stack.push(s)}
    @stack.to_string.should eq "[foo, bar, baz]"
  end

end

__END__

$ jruby -S rspec -fs spec/g_stack_spec.rb

Java::Cis::GStack once created
  should be empty
  should accept an item
  should raise an error on push (PENDING: Not yet implemented)
  should clear the stack
  should pop off top item
  should throw a StackException on pop when empty
  should peek at top item
  should throw a StackException on peek when empty
  should print something useful

Pending:
  Java::Cis::GStack once created should raise an error on push
    # Not yet implemented
    # ./spec/g_stack_spec.rb:26