Rails 4 Test Prescriptions: Build a Healthy Codebase by Noel Rappin

By Noel Rappin

Does your Rails code be afflicted by bloat, brittleness, or inaccuracy? healing those issues of a customary dose of test-driven improvement. Rails four try Prescriptions is a complete consultant to how assessments will help layout and write greater Rails functions. during this thoroughly revised variation, you'll examine why trying out works and the way to check successfully utilizing Rails four, Minitest five, and RSpec three, in addition to renowned checking out libraries resembling factory_girl and Cucumber. Do what the physician ordered to make your functions believe all higher. unwanted side effects may well contain greater code, fewer insects, and happier developers.

Your Ruby on Rails software is in poor health. points in time are looming, yet each time you are making the slightest swap to the code, whatever else breaks. not anyone recalls what that difficult piece of code was once imagined to do, and no-one can inform what it truly does. Plus, it has insects. you would like test-driven improvement, a method for bettering the layout, maintainability, and long term viability of software.

Containing either useful code examples and dialogue of why checking out works, this booklet starts off with the main simple gains introduced as a part of middle Ruby on Rails. as soon as you've built-in these beneficial properties into your coding perform, you'll how to use renowned third-party checking out instruments reminiscent of RSpec, Mocha, Cucumber, and factory_girl. You'll try the part elements of a Rails software, together with the back-end version good judgment and the front-end reveal good judgment. utilizing Rails examples, you'll use trying out to permit your code to reply higher to destiny swap. Plus, you'll see how one can deal with real-world trying out situations.

This thoroughly revised version includes a new educational, in addition to new examples through the ebook. Many chapters, together with the JavaScript bankruptcy, have passed through significant adjustments to mirror new instruments and new practices. And there are fresh chapters on trying out for safeguard, and trying out exterior prone.

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In this graph, you can see that the transistor density has continued climbing according to Moore’s Law. However, power consumption and CPU frequency have leveled off as we have bumped up against signal integrity issues and issues transferring heat from a device with such a small thermal mass to ambient Frequency Fig. 7 The Law of Dynamic Power, when graphed as a function of processor frequency, shows that as the frequency of a processor increases, the amount of power that is required to charge and discharge the processor’s capacitive load grows at an exponential rate.

These topics are discussed in the coming chapters. Summary • Software engineering is a new field when compared to Classical Thermodynamics. The number and variation of types of software development processes, patterns, refactoring techniques, and architectural styles are high. • The field of Software Thermal Management sits at the intersection of Thermodynamics, Electrical Engineering, and Software Engineering. 4 Crossroads 43 Fig. 17 Software plays a special role in thermal management architectures.

Summary • Moore’s Law says that the number of transistors per square inch has and will continue to increase at an exponential rate. • Moore’s Law has remained amazingly accurate for nearly 50 years (although we’ll see some caveats to this in Sect. 2. 2 Thermal Wall Interestingly, if we look closer, an odd phenomenon has emerged: although transistor density has continued to climb, CPU speed has not followed in the same manner. Clock speeds and power consumption have both leveled off starting in 2005 as 20 2 Landscape: History, Present Barriers, and The Road Forward Intel Transistor Density (000) 1e+07 1e+05 1e+03 1e+01 1970 1980 1990 2000 2010 Date of Introduction Fig.

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