11 tests performed on mobile apps before deployment: app testing

Do apps get certified before getting published on various app downloading platforms like Google playstore ??

Today  everyone  is using mobile phones for their various works so more & more applications are created for different uses .

But is it safe  for your device ?

Before looking for answers & getting into thoughts let me tell u  the creaters of mobile applications always test their applications functionality, usability & consistency .

"This procedure is known as mobile application testing."

•usability: how users feels while using   
the application i.e simple & interactive

•functionality: how it is performing in background i.e ram ,battery using etc.

•consistency:data getting transferred & saved properly from both client & server side

There are 2 types of testing :

Automated testing: Emulators & simulators to create a virtual environment to test various devices .

Manual testing: Different users tests the app on different devices ,includes beta testing of apps .

Perquisite knowledge before testing

There are 3 kinds:

Native apps: subjected use in particular devices  like Samsung calculator for Samsung

Mobile web apps: apps which are use used to search websites like Chrome,Firefox


Hybrid apps: combination of both native & mobile web apps like Facebook

Different types of test performed on apps

Document testing :

Prepatory testing where Testers get navigational charts, screen layouts, other requirements invisible on the design. These requirements are analyzed for completeness and inconsistency.

Functional testing :

Here system is tested against requirements .We also examine the output based on various inputs.
This testing checks User Interface, APIs, Database, Security, Client/Server communication and other functionality

Interruption testing:

 Checking about interruption caused due to:
• Incoming & outgoing SMS,MMS & calls.
•Battery discharge/removal.
•network disconnecting/connecting
•charging the device.

Business testing :

A person is able to add his/her item in cart .
Correct is displayed on the product i.e no delays in prices while on festival or like big billions days .
Transactions / withdrawals are safely made .

Constant user feedback testing:

Clicking of the buttons on the app giving perfect response as soons as the icon,button etc. Is clicked/pressed i.e no delays.
Eg : Volume up / down while playing media.

Update testing :

User's data is displayed properly while opening & stored properly while closing the app.

Device resource testing:
Lack of memory to install the application:

Usability testing:

It is aimed to check convenience of an app must 3 criterias:
------>Satisfaction

------->Efficiency

-------->Effectiveness

App is performing well in both portrait & landscape mode.
Zoom in & out is proper functioning .
Buttons etc. are not overlapping with each other.

Compatibility testing:

Unlike web applications, mobile app testing is more challenging because:


Different ranges of mobiles : with keypad ,touch screen etc.

Wide variety of mobile devices: Samsung ,Apple
etc.

Different os : like windows,iOS & android

Different versions of systems:  like android 6, android 9 etc.

Different mobile network range : like 3G,4G etc.

Performance testing:

Its main aims are:

•Load testing: checking the response      time of inputs performed by users.

•Stress testing: increasing / decreasing the loads on a device affects the performance of an app.

•Stability  testing: performance of an app on longer durations.

•concurrency testing:  increasing/decreasing the no. of users at a time affects the performance.

Security testing:

Logins, passwords & various sensitive informations are safely secured or not from various malicious attacks on apps
Or SQL injection & DOS attacks on server side.

Recovery testing:

It verifies the app under test in terms of its ability to withstand and successfully recover from possible failures caused by software errors, hardware failures, or communication problems.


After going through these testing phases it gets certified mark by various app downloading platforms like playstore etc

You have entered a wrong credit card number : dcode.luhn

   

You have entered a wrong credit card number : dcode.luhn                    

 We  are  surrounded by numbers from everywhere , like our pin , password etc;
These numbers really amazed me when I was buying something from Flipkart &accidentally entered a digit wrong of my card number in payment page .It displayed the message as shown below:

After surfing the internet I  learnt about an interesting algorithm behind our card numbers called Luhn's Algorithm.The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist hans Peter luhn., so we're gonna dcode.luhn.

Logic behind numbers

    

Step 1:
Multiply the digits at odd position by 2.

Step 2: 

If the digits multiplied by 2 becomes two digit no or no. greater than 10 then add them . For eg: 

5×2= 10 >>>1+0 = 1. 

7×2= 14 >>>1+4 = 5. 

9×2= 18 >>> 1+8 = 7.

Step 3:

Now add the new odd places digits & even places digits.

1+4+2+2+5+5+6+4+1+6+5+8+9+0+2+0 = 60

Step 4:

Check S the sum obtained in step 3 is divisible by 10 or not ,if it is then the card is valid otherwise not .

so 60/10 Remainder = 0 [true].


Therefore, the above example we use is a valid card number.

Click this link for validating

a different card numbers inputs

Note: dcode.luhn was designed to protect against accidental errors, not malicious attacks

Pseudocode [dcode.luhn]

function checkLuhn(string purportedCC) {
    int sum := integer(purportedCC[length(purportedCC)-1])
    int nDigits := length(purportedCC)
    int parity := nDigits modulus 2
    for i from 0 to nDigits - 2 {
        int digit := integer(purportedCC[i])
        if i modulus 2 = parity
            digit := digit × 2
        if digit > 9
            digit := digit - 9 
        sum := sum + digit
    }
    return (sum modulus 10) = 0
}

Applications

• IMEI numbers
• National Provider Identification number
• Survey codes appearing on MC Donalds' ,Taco Bell etc.
• Social Security Numbers .....so on

Strength

•It can detect any single error.

Weakness:

• Even a 16 digit 0 code will be  a valid card number.

•Transposition of two digits 09 to 90 [vice-versa] is not detectable.
• It can't detect in twin digits 22 <-->55 
  For eg:
      22......... till 16 digits

           2+(4)=6.       [ 2×2=4]     
     
     55..... till 16 digits
        5×(1+0)= 6      [5×2=10]

One more thing I didn't mentioned other things  in are also considered validation

"Comment your queries ,love below &; don't forget to share it"

Why to learn C++ ?

C++ is created by Bjarne Strousoup is one of the  widely used language nowadays .

It is the successor of c language which is a procedural programming language (where we  do a problem step wise) .

Why C++?

•We brought a new concept in our programming language to solve any real life problem easily called OOPS [Object Oriented Programming Language] .

This concept brought power to our  languages .

•It is a generic programming language which means i.e algorithm written for one data type will not be different for different data types.

•It got  rich libraries ,from which we can make new codes.

•It is very fast.

•It's best to use while making system softwares.

APPLICATIONS

•Firefox & chrome have codes written in this language.

•Being closer to hardware mainly used to create system softwares.

•Used as an embedded language in machines.

•Various games like Doom,Counter Strike.

•Database softwares like MySQL

More...

It is written in c++

Job & Salary

Salary information from  gooroo.io
                                

               

•Junior Programmer

•Senior Programmer

•Software Developer

•Quality Analyst

•Game Programmer

•Software Developer Engineer

•C/C++ Analyst

Real meaning of programming language

 Programming language

A computer don't understand  human language as it is a machine.
So in order to interact with a machine
we need to learn a language called machine language or binary language[0 or 1]
In simple words On / Off.
But it is difficult for us to understand or write it.

So in order to communicate with computer we developed a language called programming language / high level language.

This is how a programming language looks like

Computer programs are written in various
programming language which is then converted to machine language using
translators like assembler,compiler & interpreter.

Pic credit: geeks for geeks

Have you ever wondered how double clicking an icon on the windows opens the application well it's because all OS are made up of programming languages so there is a statement in program which tells the computer to open the application if someone presses double click on it.

Android is a program

Every application or machine you use it's made from programming language.

From oldest programming language
[ COBOL & Fortran] to the advanced programming language we use today like
C++,java,python ,PHP etc. which can easily solve any real life problem.We are still working on more..
and each programming language has its own syntax .So one must learn it before writing a program.

Top 10 programming languages

But if you're thinking that whenever a new Programming language comes  it has to replace the old one , then you're wrong
Because every language has its own beauty.