def test_plant_decreases():
# first get a benchmark
plant_biomass = 90.
soil_water = 0
grazing_loss = 0.3
senescence = 0.1
growth_constant = 0.05
uptake = 10.
uptake_saturation = 3.
change_1 = PG.calc_plant_change(plant_biomass, soil_water, uptake,
uptake_saturation, growth_constant,
senescence, grazing_loss)
# now increase grazing_loss
grazing_loss = 0.5
change_2 = PG.calc_plant_change(plant_biomass, soil_water, uptake,
uptake_saturation, growth_constant,
senescence, grazing_loss)
assert (change_1 > change_2)
# now increase senescence
senescence = 0.2
change_3 = PG.calc_plant_change(plant_biomass, soil_water, uptake,
uptake_saturation, growth_constant,
senescence, grazing_loss)
assert (change_2 > change_3)
def test_plant_increases():
# first get a benchmark
plant_biomass = 90.0
soil_water = 0
grazing_loss = 0.3
senescence = 0.1
growth_constant = 0.05
uptake = 10.0
uptake_saturation = 3.0
change_1 = PG.calc_plant_change(
plant_biomass,
soil_water,
uptake,
uptake_saturation,
growth_constant,
senescence,
grazing_loss,
)
# now increase the soil water
soil_water = 3.0
change_2 = PG.calc_plant_change(
plant_biomass,
soil_water,
uptake,
uptake_saturation,
growth_constant,
senescence,
grazing_loss,
)
assert change_2 > change_1
def test_plant_change_zero():
plant_biomass = 0.
soil_water = 0
grazing_loss = 0.3
senescence = 0.1
growth_constant = 0.05
uptake = 10.
uptake_saturation = 3.
assert (PG.calc_plant_change(plant_biomass, soil_water, uptake,
uptake_saturation, growth_constant,
senescence, grazing_loss) == 0)