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fc43bd457b
New 137-line test file included in main test/runtests.jl: - Tests extract_strain() function (displacement gradient → strain tensor) - Tests extract_strain_rate() function (velocity gradient → strain rate tensor) - Tests pure extension, shear deformation, and general deformation cases - Tests quasi-static strain rate from increments - Validates symmetric tensor properties and engineering shear strain Ensures strain extraction functions work correctly for continuum mechanics.