unclejamal

Here's what I meant when I said tests can break even if you only move a method to a different class.

This was the code before we started refactoring:

class BreadShop { ...
public void deposit(int accountId, int creditAmount) {
        Account account = accountRepository.getAccount(accountId);
        if (account != null) {
            final int newBalance = account.deposit(creditAmount);
            events.newAccountBalance(accountId, newBalance);

unclejamal

PODCASTS:
http://rubyrogues.com/ - about programming in general, not always Ruby-specific (below a list of some episodes I found good, among many others)
- http://rubyrogues.com/131-rr-how-to-learn/ - episode about learning
- http://rubyrogues.com/023-rr-book-club-smalltalk-best-practice-patterns-with-kent-beck/ - episode with Kent Beck
- http://rubyrogues.com/068-rr-book-club-growing-object-oriented-software-guided-by-tests/ - episode about the GOOS book

http://pragprog.com/podcasts - about programming in general
- includes interviews with UncleBob, Kent Beck, Ward Cunningham, etc...

http://www.functionalgeekery.com/ - about functional programming

unclejamal

module Roots
  def self.rootn(x,n)
    Math.exp(Math.log(x)/n)
  end
end

module Notes
  def self.c accidental, octave
    Note.new(4, octave, accidental)
  end

unclejamal

require_relative 'music'

describe "music kata" do
  it "models octaves" do
    Notes.c(:simple, 1).pitch.should == 4
    Notes.c(:simple, 2).pitch.should == 16
    Notes.c(:simple, 8).pitch.should == 88
  
    Notes.e(:simple, 1).pitch.should == 8
  end

unclejamal

public class Main {

    public static void main(String[] args) {
        new Main().startTimeExpert();
    }

    private void startTimeExpert() {
        final TimeExpertServer timeExpert = new TimeExpertServer(new RealClock());
        try {
            timeExpert.start();

unclejamal

public void start() {
    server = new Server(6666);
    ServletContextHandler handler = new ServletContextHandler();
    handler.setContextPath("");
    // adds Jersey Servlet with a customized ResourceConfig
    handler.addServlet(new ServletHolder(new ServletContainer(resourceConfig())), "/*");
    server.setHandler(handler);
    try {
        server.start();
    } catch (Exception e) {

unclejamal

@Path("time")
public class TimeResource {

    private final Clock clock;

    public TimeResource(Clock clock) {
        this.clock = clock;
    }

    @GET

unclejamal

@Test
public void saysTheCurrentTime() throws Exception {
    givenTheCurrentTimeIs("20:15");
    whenAUserChecksTheTime();
    thenTheUserSees("It's currently 20:15!");
}

private void givenTheCurrentTimeIs(String currentTime) throws ParseException {
    Date currentTimeAsDate = new SimpleDateFormat("HH:mm").parse(currentTime);
    clock.setNow(currentTimeAsDate);

unclejamal

@Before
public void startApplication() {
    clock = new FixedClock();
    timeExpert = new TimeExpertServer(clock);
    timeExpert.start();
}

unclejamal

public class FixedClock implements Clock {
    private Date fixedNow;

    @Override
    public Date now() {
        return fixedNow;
    }

    public void setNow(Date fixedNow) {
        this.fixedNow = fixedNow;