Consider extending test-functions-doc with invocation of undeclared functions

[hohwille]

As a devonfw-ide PO, I want automated tests on the code so that bugs are detected early.
Developing bash is tedious. Where other programming languages like Java or C# would raise compile errors, we get successful build and tests even though the code is obviously broken.

As we have a strict convention to name all functions following the pattern do[A-Z][a-zA-Z]* we could easily extend our test-functions-doc with a check that greps all such patterns from functions and for each unique of them (sort -u) check if has been declared.
Otherwise raise and error and break the build.

So if functions contains e.g. doUndefinedFunction but not function doUndefinedFunction() then the test should report that doUndefinedFunction is undefined and fail.

[mustafaokyay]

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