UnitTest Coverage

[epsi1on]

UnitTest are implemented for several elements, like EulerBernoulliBeamHelper, ShaftHelper and TrussHelper. Also there is need to have unit test for interaction of each helper with a ElementalLoad. For example EulerBernoulliBeamHelper should be able to calculate the Equivalent Nodal Loads for a specific ElementalLoad, for example UniformLoad or ConcentratedLoad or PartialNonuniformLoad. At the time tests are implemented for BarElement's ElementalLoads almost completely
BarElementConcentratedLoadTests.cs, BarELementPartialNonuniformLoadTests.cs and BarElementUniformLoadsTests.cs
Unit tests are inside BriefFiniteElementNet.Tests project.

Todo:

• Add unit test for interaction between BarElement and PartialNonuniformLoad (file BarELementPartialNonuniformLoadTests.cs already exists)
  Add unit test forTriangleElement` and tetrahedron