Main > Reference Manual > Unit tests > TestOperationPreOp

This test verifies the behavior of pre-operation and post-operation delays.
These are as delay times before and after an operation, which the solver tries to respect but can violate if required.

Several cases are included in this test:

  1. Post-operation time on a fixed-time operation.
    The post-operation time is respected when possible, but when running against a lead time constraint the post-operation time is reduced to meet the demand on-time / asap.
  2. Post-operation time on a time-per operation.
    The constraint is again a lead time constraint.
  3. Post-operation time on fixed-time operation.
    This time the constraint is the late supply of raw material supply. It causes the post-operation time to be reduced.
  4. Post-operation time on multiple levels in the supply path.
    The supply path is four levels deep, and a post-operation time is set at each level.
    In case of material of lead time constraints the post-operation time on the most upstream operation/operations (i.e. operations deeper in the bill of material) is/are shrunk first.