Testability Explorer: Using Byte-Code Analysis to Engineer Lasting Social Changes in an Organization’s Software Development Process. (Or How to Get Developers to Write Testable Code)
Presented at 2008 OOPSLA by Miško Hevery a Best Practices Coach @ Google
Abstract
Testability Explorer is an open-source tool that identifies hard-to-test Java code. Testability Explorer provides a repeatable objective metric of [...]

by Miško Hevery
After reading the article on Singletons (the design anti-pattern) and how they are really global variables and dependency injection suggestion to simply pass in the reference to the singleton in a constructor (instead of looking them up in global state), many people incorrectly concluded that now they will have to pass the singleton [...]

(the other title: Your Application has a Wiring Problem)
In My main() Method Is Better Than Yours we looked into what a main() method should look like. There we introduced a clear separation between (1) the responsibility of constructing the object graph and (2) the responsibility of running the application. The reason that this separation is [...]

by Miško Hevery
In Singletons are Pathological Liars we discussed the problems of having singletons in your code. Let’s build on that and answer the question “If I don’t have singletons how do I ensure there is only one instance of X and how do I get X to all of the places it is needed?”
An [...]

by Miško Hevery
So you join a new project, which has an extensive mature code base. Your new lead asks you to implement a new feature, and, as a good developer, you start by writing a test. But since you are new to the project, you do a lot of exploratory “What happens if I execute [...]

by Miško Hevery
Procedural languages allowed us to remove GOTOs in our code. I would like to think that OO languages allow us to remove IFs (conditionals). I know you can’t remove of all the IFs, but it is interesting just how many IFs you can remove in an application.
You can’t remove these IFs:

Comparing relative sizes [...]

by Miško Hevery
So you discovered dependency injection and GUICE and you are happily refactoring and writing new tests for you code until you come across this circular reference.
class A {
final B b;
A(B b){
this.b = b;
}
}

class B {
final A a;
B(){
[...]