Member of Technical Staff II

Design a Singleton class, and write unit tests for each method within it. Also, how can you verify that the class is indeed a Singleton?

How can you mock the behavior of a FileReader (for unit testing purpose)?

• There are two processes that wish to communicate with each other. How many different ways are possible?
• What is difference between a Process and a Service in Windows?

• Write into a file using 2 Threads such that the odd line numbers are printed by Thread 1 and the even line numbers are printed by Thread 2.
  E.g.  Line 0: Thread 2
          Line 1: Thread 1
          Line 2: Thread 2
• What are Win32 APIs? How can these APIs be invoked by C#?

• What is the difference between a process running in System Context vs a process running in User Context?
• How does async-await work in .NET? Explain what happens behind the scene when you use .ConfigureAwait(false) with an async call.

You have been given two strings, 'str1' and 'str2'.

Your task is to return true if the given two strings are isomorphic to each other, else return false.

Note :

Two strings are isomorphic if a one-to-one mapping is possible for every character of the first string ‘str1’ to every character of the second string ‘str2’ while preserving the order of the characters.

All occurrences of every character in the first string ‘str1’ should map to the same character in the second string, ‘str2’.

For example :

If str1 = “aab” and str2 = “xxy” then the output will be 1. ‘a’ maps to ‘x’ and ‘b’ maps to ‘y’.

If str1 = “aab” and str2 = “xyz” then the output will be 0. There are two different characters in 'str1', while there are three different characters in 'str2'. So there won't be one to one mapping between 'str1' and 'str2'.

• How can you resolve merge conflicts in the most efficient way?
• Tell me about your current project, and your roles and contributions to it
• Two developers are working in different time zones, and their works are interlinked with each other. What are the best practices they should follow to ensure a streamlined process?