Due to what can increase the efficiency of development?

Development is of two types.
1. Personal development.
2. Group development

1.Personal development.
Even if everything always works for You, there will be a user for whom your product will not work or will work differently. The task of the developer is to find the error and fix it. Without tests, You're like a blind kitten, going through a chain of events, tracking the failure, and it's good if you have access to the computer that is having problems, and if there is no access?
When using tests, they will show where the problem is or significantly narrow its search.
And mistakes can be due to:

• Incompatibilities with the new operating environment
• Operating system update
• Hardware errors (motherboard, graphics card, hard drive, etc.))
• Incorrect operation of the driver
• ОBugs in a new development environment or in a new version of components

Wherever there are errors, they seek and eliminate You. Tests help to solve this problem.
In addition to finding errors, tests allow you to make an assessment:

• How will your product work in the new operating environment?
• How complete and fast is Your program?
• How much more efficient is the new development environment than the old one?

Who will answer these questions, and how much time should be spent without tests?
Users can work with the program not as you want, but as You would not even come to mind. And Your task is to check the performance of the program for any incorrect input or incorrect use of Your program.

2. Group development.
For a developer:
If You work in a team and your modules overlap with those of other developers, there may be a situation where modifying other modules may disrupt your functionality.
You are working on another project, and you “arrives” claim that the old module that worked for a long time, today does not work. You're sure you didn't change anything, but who's to blame?
If there are no tests in your module, you need to understand where the error occurred.
With tests ,the “headache” is shifted to the one who created the error - this is the most important thing!
You are released from additional work, you have TIME that You will not spend on correcting other people's errors.
Time - the most valuable resource that nothing can be filled, it can only be spent, and the older you get, the more it imbued. And this free time you can spend with greater benefit.
For managers:
If there is one programmer in the company and he has one simple product, you ask yourself: “Why do we need tests?”But You have a group of programmers who use common libraries, modules, and testing becomes a very important stage of development.
How to control the work of programmers without tests?
The programmer says: “Everything is fine, everything works.”Is that really so? What are your criteria for evaluating developer words?
Tester report?
What percentage of the functional test the tester?
Does the tester have automated tests?
And the programmer?
Is there a programmer's report on the tests performed? \ He turned in his paper. How well is the code executed and how resilient is the code to erroneous data? “Everything is fine, everything works” - you hear the words of the programmer. As a leader, are you better off believing words or seeing confirmed facts ?
And when you give the task to change / expand the functionality, why not the first time everything worked perfectly? Why are there errors after the words “everything is fine, everything works”?
Or Your company adheres to the rule: “Make a release-give to the customer. Mistakes will be corrected later”?
If you are developing a CRM system, perhaps this approach will work more or less painlessly.
If You are developing accounting\inventory accounting, the cost of your error will be more significant in financial terms.
But if you are developing control systems for industrial or medical equipment, this approach is unacceptable. The cost of the mistake can be human life!
Unfortunately, many development departments work according to the rule: “Errors will be corrected later”, even when developing SOFTWARE for industrial equipment management. And if there is in such departments tests, then in much of only on paper. Because the programmer says: “there is No time”, “the time of test imposition is greater than or equal to the development time”.
At the moment TestMeCode is a very quick overlay of the test code. Spend timing. Compare how much a programmer will write a class, and how long will it take to put the test class using TestMeCode. You will be pleasantly surprised.