if (NOT OGS_USE_MPI)
    # Comparison test for richards mechanics w/o deformations.
    OgsTest(PROJECTFILE RichardsMechanics/RichardsFlow_2d_richardsflow.prj)
    OgsTest(PROJECTFILE Parabolic/Richards/flow_fully_saturated.prj)
endif()

AddTest(
    NAME 2D_RichardsFlow_h_us_quad_ogs5
    PATH Parabolic/Richards
    EXECUTABLE ogs
    EXECUTABLE_ARGS RichardsFlow_2d_compare_ogs5.prj
    TESTER vtkdiff
    DIFF_DATA
    h_us_quad_1000.vtu richards_ts_100_t_100.000000.vtu PRESSURE1 pressure 1e-1 1e-1
    REQUIREMENTS NOT OGS_USE_MPI
)

AddTest(
    NAME 2D_RichardsFlow_h_us_quad_small
    PATH Parabolic/Richards
    EXECUTABLE ogs
    EXECUTABLE_ARGS RichardsFlow_2d_small.prj
    TESTER vtkdiff
    RUNTIME 7
    DIFF_DATA
    ref_t_1600.000000.vtu richards_ts_1100_t_1600.000000.vtu pressure pressure 1e-8 1e-8
    REQUIREMENTS NOT OGS_USE_MPI
)

AddTest(
    NAME 2D_RichardsFlow_h_us_quad
    PATH Parabolic/Richards
    RUNTIME 65
    EXECUTABLE ogs
    EXECUTABLE_ARGS RichardsFlow_2d_large.prj
    TESTER vtkdiff
    DIFF_DATA
    ref_t_20000.000000.vtu richards_ts_18200_t_20000.000000.vtu pressure pressure 1e-8 1e-8
    REQUIREMENTS NOT OGS_USE_MPI
)

AddTest(
    NAME 2D_RichardsFlow_h_us_quad_small_PID_adaptive_dt
    PATH Parabolic/Richards
    EXECUTABLE ogs
    EXECUTABLE_ARGS RichardsFlow_2d_small_PID_adaptive_dt.prj
    TESTER vtkdiff
    DIFF_DATA
    richards_pcs_PID_adaptive_dt_t_1600.vtu  richards_pcs_PID_adaptive_dt_t_1600.vtu pressure pressure 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_1600.vtu  richards_pcs_PID_adaptive_dt_t_1600.vtu saturation saturation 1e-8 1e-9
# The following three comparisons are used just to check whether the output is
# made at the fixed times of 10, 50, 100 and 500, which are given in the project
# file of RichardsFlow_2d_small_adaptive_dt.prj
    richards_pcs_PID_adaptive_dt_t_10.vtu  richards_pcs_PID_adaptive_dt_t_10.vtu pressure pressure 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_10.vtu  richards_pcs_PID_adaptive_dt_t_10.vtu saturation saturation 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_50.vtu  richards_pcs_PID_adaptive_dt_t_50.vtu pressure pressure 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_50.vtu  richards_pcs_PID_adaptive_dt_t_50.vtu saturation saturation 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_100.vtu  richards_pcs_PID_adaptive_dt_t_100.vtu pressure pressure 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_100.vtu  richards_pcs_PID_adaptive_dt_t_100.vtu saturation saturation 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_500.vtu  richards_pcs_PID_adaptive_dt_t_500.vtu pressure pressure 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_500.vtu  richards_pcs_PID_adaptive_dt_t_500.vtu saturation saturation 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_1000.vtu  richards_pcs_PID_adaptive_dt_t_1000.vtu pressure pressure 1e-8 1e-9
    richards_pcs_PID_adaptive_dt_t_1000.vtu  richards_pcs_PID_adaptive_dt_t_1000.vtu saturation saturation 1e-8 1e-9
    REQUIREMENTS NOT OGS_USE_MPI
)

AddTest(
    NAME 2D_RichardsFlow_h_us_quad_small_iteration_adaptive_dt
    PATH Parabolic/Richards
    EXECUTABLE ogs
    EXECUTABLE_ARGS RichardsFlow_2d_small_iteration_adaptive_dt.prj
    REQUIREMENTS NOT OGS_USE_MPI
    RUNTIME 51
    # No vtkdiff comparison here, because of the different file names for
    # different machines, which again is due to the adaptive time stepping
    # scheme. When the output file format can be specified in the project files,
    # e.g. in the form Richards_%t where %t is the current time, the output will
    # no longer be ambiguous.
)

#PETSc/MPI
#AddTest(
#    NAME 2D_RichardsFlow_h_us_quad_small_PID_adaptive_dt
#    PATH Parabolic/Richards
#    EXECUTABLE_ARGS RichardsFlow_2d_small_PID_adaptive_dt.prj
#    WRAPPER mpirun
#    WRAPPER_ARGS -np 1
#    TESTER vtkdiff
#    REQUIREMENTS OGS_USE_MPI
#    RUNTIME 220
#    DIFF_DATA
#    ref_t_1600.000000.vtu richards_ts_803_t_1600_000000_0.vtu pressure pressure 1e-8 1e-3
#)

# Comparison test for richards mechanics w/o deformations.
AddTest(
    NAME Parallel_RichardsMechanics_RichardsFlow_2d_richardsflow
    PATH RichardsMechanics
    EXECUTABLE ogs
    EXECUTABLE_ARGS RichardsFlow_2d_richardsflow.prj
    WRAPPER mpirun
    WRAPPER_ARGS -np 1
    TESTER vtkdiff
    REQUIREMENTS OGS_USE_MPI
    DIFF_DATA
    RichardsFlow_2d_richardsflow_ts_99_t_1900.000000.vtu RichardsFlow_2d_richardsflow_ts_99_t_1900_000000_0.vtu pressure pressure 5e-8 1e-10
    RichardsFlow_2d_richardsflow_ts_99_t_1900.000000.vtu RichardsFlow_2d_richardsflow_ts_99_t_1900_000000_0.vtu saturation saturation 1e-10 1e-11
)