There are millions of test combinations. Its not possible to test each and every combination both in manual as well as in automation testing.
2) Misunderstanding of company processes:
Some times we dont pay proper attention what the company-defined processes are and these are for what purposes. There are some myths in testers that they should only go with company processes even these processes are not applicable for their current testing scenario. This results in incomplete and inappropriate application testing.
3) Relationship with developers:
Big challenge. Requires very skilled tester to handle this relation positively and even by completing the work in testers way. There are simply hundreds of excuses developers or testers can make when they are not agree with some points. For this tester also requires good communication, troubleshooting and analyzing skill.
4) Regression testing:
When project goes on expanding the regression testing work simply becomes uncontrolled. Pressure to handle the current functionality changes, previous working functionality checks and bug tracking.
5) Lack of skilled testers:
I will call this as wrong management decision while selecting or training testers for their project task in hand. These unskilled fellows may add more chaos than simplifying the testing work. This results into incomplete, insufficient and ad-hoc testing throughout the testing life cycle.
6) Testing always under time constraint:
There is huge list of tasks that you need to complete within specified time. This includes writing, executing, automating and reviewing the test cases.
7) Which tests to execute first?
If you are facing the challenge stated in point no 6, then how will you take decision which test cases should be executed and with what priority? Which tests are important over others? This requires good experience to work under pressure.
8 ) Understanding the requirements:
Some times testers are responsible for communicating with customers for understanding the requirements.
9) Automation testing:
Many sub challenges Decision of automation or manual testing will need to address the pros and cons of each process.
10) Decision to stop the testing:
Very difficult decision. Requires core judgment of testing processes and importance of each process.
11) One test team under multiple projects:
Challenging to keep track of each task. Communication challenges. Many times results in failure of one or both the projects.
12) Reuse of Test scripts:
Application development methods are changing rapidly, making it difficult to manage the test tools and test scripts. Test script migration or reuse is very essential but difficult task.
13) Testers focusing on finding easy bugs:
If organization is rewarding testers based on number of bug then some testers only concentrate on finding easy bugs those dont require deep understanding and testing. A hard or subtle bug remains unnoticed in such testing approach.
14) To cope with attrition:
Increasing salaries and benefits making many employees leave the company at very short career intervals. Managements are facing hard problems to cope with attrition rate. Challenges New testers require project training from the beginning, complex projects are difficult to understand, delay in shipping date.