Update callbacks and tests (#482)

---------

Co-authored-by: giovanni <giovanni.canali98@yahoo.it>

tests/test_callback/test_progress_bar.py

@@ -5,29 +5,32 @@ from pina.callback.processing_callback import PINAProgressBar
 from pina.problem.zoo import Poisson2DSquareProblem as Poisson
 
 
-# # make the problem
-# poisson_problem = Poisson()
-# boundaries = ['nil_g1', 'nil_g2', 'nil_g3', 'nil_g4']
-# n = 10
-# poisson_problem.discretise_domain(n, 'grid', locations=boundaries)
-# poisson_problem.discretise_domain(n, 'grid', locations='laplace_D')
-# model = FeedForward(len(poisson_problem.input_variables),
-#                     len(poisson_problem.output_variables))
+# make the problem
+poisson_problem = Poisson()
+boundaries = ["g1", "g2", "g3", "g4"]
+n = 10
+condition_names = list(poisson_problem.conditions.keys())
+poisson_problem.discretise_domain(n, "grid", domains=boundaries)
+poisson_problem.discretise_domain(n, "grid", domains="D")
+model = FeedForward(
+    len(poisson_problem.input_variables), len(poisson_problem.output_variables)
+)
 
-# # make the solver
-# solver = PINN(problem=poisson_problem, model=model)
+# make the solver
+solver = PINN(problem=poisson_problem, model=model)
 
 
-# def test_progress_bar_constructor():
-#     PINAProgressBar(['mean'])
+def test_progress_bar_constructor():
+    PINAProgressBar()
 
-# def test_progress_bar_routine():
-#     # make the trainer
-#     trainer = Trainer(solver=solver,
-#                       callback=[
-#                           PINAProgressBar(['mean', 'laplace_D'])
-#                       ],
-#                       accelerator='cpu',
-#                       max_epochs=5)
-#     trainer.train()
-#     # TODO there should be a check that the correct metrics are displayed
+
+def test_progress_bar_routine():
+    # make the trainer
+    trainer = Trainer(
+        solver=solver,
+        callbacks=[PINAProgressBar(["val", condition_names[0]])],
+        accelerator="cpu",
+        max_epochs=5,
+    )
+    trainer.train()
+    # TODO there should be a check that the correct metrics are displayed