tests, I have the unit test framework in hand and an idea of new class. So let's get started.
Let say I want to encapsulate an unchangeable C character buffer with a length into the simple class `const_string`.
-Rationale: a string class that does not allocate a memory and provide a convenient read-only access to the preallocated
+Rationale: a string class that does not allocate a memory and provide a convenient read-only access to the pre-allocated
character buffer. I will probably want `const_string` to have an interface similar to the class std::string. What will I
do first? In my new life I will start with writing a test module for future class `const_string`. It will look like
this: