Add unit test for BwdTrans operator

This adds a starting point for a unit test validating the currently implemented BwdTrans operator. This is also infrastructure and a template for testing future operators implementation as they are integrated. The unit test is based on Boost.Test. Other popular options exist but if I remember well boost.test is already used for testing some parts of Nektar++.

The test uses a fixture structure InitFields for which the constructor and destructor is called at the beginning and end of the test. It provides access to two (input/output) Field instance that can be then passed to the operator. Member of the fixture object are accessible within the test block without prefixing their name with obj. but for clarity fixture members are prefixed with fixt_.

Code responsible for creating the fields is taken straight from main.cpp, although the session file is hardcoded in the fixture constructor.

• The InitFields fixture currently has pointers to fields as attributes. This bypasses the need for a Field default constructor which the class currently doesn't have -- not obvious to me how t o initialise Field members in that case.
• The test currently fails reporting that no session file was given.

mentioned in issue #1 (closed)

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• 1e6ec539 - fix: Provide fake executable name as first cli argument

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• 7a873d9f - Switch fixt fields to be declared on the heap.

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• 5de52edb - Very basic BwdTrans StdMat unit test.

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• 5cc8c68c - docs: Adds some comments and docstrings

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• 73940333 - Remove code used for debugging

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• 5f80b787 - cast string literals to char*

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resolved all threads

@ccantwel I don't have permissions to merge, so this is all yours.

mentioned in issue #2 (closed)

Should we add it as a test in the CMakeLists.txt, so we can just run ctest after compiling?

We also need to make sure it gets the square.xml file from somewhere. At the moment, we need to manually copy it into the build/tests directory for it to work.

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• b4dbe125 - Register test to CTest

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merged

mentioned in commit eb03cdc8