Przejdź do głównej zawartości

Looking back at the year 2015

I want to share some of my reflections over what I experienced in the ending year 2015 in software development area.

I attended two conferences this year: Agile Central Europe and Scrumdays (and ran a Practical Scrum workshop at the latter). The most influential and interesting speeches, in my opinion, were these two:
At each conference, there were lots of Scrum Masters (probably more than 50% of the attendees), quite many Product Owners, many "other people" and very little developers. What were they doing while their Scrum Masters and POs were at a conference? What other kind of gathering they attended last year?
Scaled Scrum / Scaled Agile
It seems like everybody wants to be doing Scaled Something nowadays and everybody wants Scaled Scrum more than they want decent Scrum. When Gunther Verheyen gave his presentation about Nexus at Scrumdays conference he made a joke that everybody wants Scaled Scrum to produce more crappy software. I believe Scrum Masters and Product Owners should pay attention to doing Scrum well not at least to the same degree as to doing scaling well.

Programming languages popularity
Java is making a strong comeback. According to TIOBE, it now has about 20% share. It had 14% at the end of 2014 and now it is back at the level it had in 2005 (15 years ago!). The popularity of Java is corroborated by the amount of job offers in this domain. This is very interesting trend, because a while back it seemed it will go out of favor.

Interestingly, pure C language has not fallen below 15% for the last 7 years and has pretty constant share.


Popularne posty z tego bloga

Unit Testing code with IO file operations (in Python)

We may often come across a piece of code that was written without Unit Tests at all. In addition, the piece of code may be dealing with IO like file writing and reading, which makes it more difficult to Unit Test it when we are trying to refactor and modify. Let's suppose the code in question looks like this:

def writeInitialsToFile(filename, name, surname):
    initials = name[0] + '.' + surname[0] + '.'
    with open(filename, 'w') as file:

def readInitials(filename):
    initials = None
    with open(filename, 'r') as file:
        initials = file.readline()
    return initials

A straightforward and bad idea would be to write a couple of Unit Tests that make use of a real file and simply test the reading and writing. Is therea a better way to test this code?

First of all, we need a way to replace the real file with something else. For both reading and writing we will now have a couple of functions, one that expects a stream fo…

Piotr's Less Obvious Advice on Google Mock: State maintenance

Google Mock provides several ways to maintain state inside mock objects. One way of implementing state maintenance is with SaveArg. Consider the following example.

We have a class Configurator, which allows a caller to set and get values of a parameter:

class Configurator

    virtual ~Configurator() {}

    virtual void setParamX(int n) = 0;
    virtual int getParamX() = 0;

And we have a class Client that calls Configurator's methods and it also has a method incParamXBy, that can be used to increase the current value of paramX by a certain value.

class Client

    Client(Configurator & cfg);
    virtual ~Client() {}

    void setParamX(int n);
    void incParamXBy(int n);
    int getParamX();


    Configurator & _cfg;

incParamXBy internally calls setParamX and getParamX on Configurator:

void Client::incParamXBy(int n)
    _cfg.setParamX(_cfg.getParamX() + n);

Let's assume that the initial value of paramX is A and that we want to increase paramX by…

Piotr's Less Obvious Advice on Google Mock: Returning new objects from a mock

Google Mock provides a way to return newly created objects from a mock method. Suppose we have a  Generator class that is supposed to generate new objects when createNewRecord method is called:

class Generator
    virtual ~Generator() {}
    virtual Record * createNewRecord() = 0;

...and suppose we want to mock this class:

class MockGenerator : public Generator
    MOCK_METHOD0(createNewRecord, Record * ());

Suppose the caller class Client has run method defined as follows:

void Client::run()
    for(int i = 0; i < 3; i++)
        rec_tab[i] = gen.createNewRecord();

We want the mock to return a pointer to a new object each time createNewRecord is called. This is how we can express this in the test code:

TEST(ClientTest, CanRun)
    MockGenerator gen;
    Client c(gen);

    EXPECT_CALL(gen, createNewRecord())
                 //this is equivalent of returning new Record(1,2,3)