Remove unneeded tests

tests/test_PostProcessing.py

@@ -347,30 +347,6 @@ def test_plot_seq_design_diagnostics(basic_engine_sequential):
     assert os.path.exists(f"./{post.out_dir}/seq_design_diagnostics/seq_RMSEMean.{post.out_format}")
     assert os.path.exists(f"./{post.out_dir}/seq_design_diagnostics/seq_RMSEStd.{post.out_format}")
 
-def test_plot_seq_design_diagnostics_with_custom_values(basic_engine_trained):
-    """
-    Test the plot_seq_design_diagnostics method with custom values
-    """
-    engine = basic_engine_trained
-    engine.ExpDesign.X = np.array([[0.1], [0.3], [0.5], [0.7], [0.9]])
-    engine.ExpDesign.Y = np.array([[2], [4], [6], [8], [10]])
-    post = PostProcessing(engine)
-    post.plot_seq_design_diagnostics()
-    # Check if the plot was created and saved
-    assert os.path.exists(f"./{post.out_dir}/seq_design_diagnostics/Seq_Design_Diagnostics.{post.out_format}")
-
-def test_plot_seq_design_diagnostics_with_empty_values(basic_engine_trained):
-    """
-    Test the plot_seq_design_diagnostics method with empty values
-    """
-    engine = basic_engine_trained
-    engine.ExpDesign.X = np.array([])
-    engine.ExpDesign.Y = np.array([])
-    post = PostProcessing(engine)
-    with pytest.raises(ValueError) as excinfo:
-        post.plot_seq_design_diagnostics()
-    assert "ExpDesign.X and ExpDesign.Y cannot be empty" in str(excinfo.value)
-    
 #%% sobol_indices
 
 def test_sobol_indices_pce(pce_engine) -> None: