Functional testing is to verify the function of the product, test one by one according to the functional test cases, and check whether the product meets the user's requirements.
definition
Functional testing, also known as behavior testing, is to test the product characteristics and operational behavior according to the product characteristics, operation description and user scheme to ensure that it meets the design requirements. The functional test of localization software is used to verify whether the application or website can work normally for the target users.
Use the appropriate platform, browser and test scripts to ensure that the target user's experience is good enough, as if the application was specially developed for this market. Functional testing is to test the software according to the functional requirements to ensure that the program runs in the expected way. All the features and functions of the system have been tested to ensure that they meet the requirements and specifications.
Functional testing, also called black-box testing or black-box testing, only needs to consider each function to be tested, and does not need to consider the internal structure and code of the whole software. Generally, based on the interface and architecture of software products, test cases are written according to the requirements, and the input data are evaluated between the expected results and the actual results, so that the products can meet the requirements of users.
App application
Applied electronic technology test;
Printed circuit board (PCB), also known as printed circuit board (PCB), is an important electronic component, a supporter of electronic components, and a provider of circuit connection of electronic components. Because it is made by electronic printing technology, it is called "printed" circuit board.
Before the appearance of printed circuit board, the interconnection between electronic components depended on the direct connection of wires to form a complete circuit. Circuit bread board only exists as an effective experimental tool, and printed circuit boards have become the absolute dominant position in the electronic industry.
At the beginning of the 20th century, in order to simplify the manufacture of electronic machines, reduce the wiring between electronic parts and reduce the manufacturing cost, people began to study the method of replacing wiring with printing. In the past 30 years, engineers have continuously proposed to use metal conductors as wiring on insulating substrates. The most successful thing is that in 1925, Charles Ducas of the United States printed a circuit pattern on an insulating substrate, and then successfully established a conductor for wiring by electroplating.
Until 1936, Austrian Paul isler published the foil technology in Britain, and he used the printed circuit board in a radio device. In Japan, Shigeru Miyamoto's assistant successfully applied for a patent (patent number 1 19384) by spraying wiring method "メタリコンンンン".
Among them, Paul Eisler's method is most similar to the current printed circuit board. This practice is called subtraction, which removes unnecessary metals. The method of Charles Ducas and Hayashi Miyamoto is to add only the required wiring, which is called the addition process. Even so, due to the high calorific value of electronic parts at that time, it was difficult to use the two substrates together [1], so there was no formal practical work, but it also made the printed circuit technology further.