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diff --git a/src/python/test/test_persistence_graphical_tools.py b/src/python/test/test_persistence_graphical_tools.py
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+""" This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+    Author(s):       Vincent Rouvreau
+
+    Copyright (C) 2021 Inria
+
+    Modification(s):
+      - YYYY/MM Author: Description of the modification
+"""
+
+import gudhi as gd
+import numpy as np
+import matplotlib as plt
+import pytest
+import warnings
+
+
+def test_array_handler():
+    diags = np.array([[1, 2], [3, 4], [5, 6]], float)
+    arr_diags = gd.persistence_graphical_tools._array_handler(diags)
+    for idx in range(len(diags)):
+        assert arr_diags[idx][0] == 0
+        np.testing.assert_array_equal(arr_diags[idx][1], diags[idx])
+
+    diags = [(1.0, 2.0), (3.0, 4.0), (5.0, 6.0)]
+    arr_diags = gd.persistence_graphical_tools._array_handler(diags)
+    for idx in range(len(diags)):
+        assert arr_diags[idx][0] == 0
+        assert arr_diags[idx][1] == diags[idx]
+
+    diags = [(0, (1.0, 2.0)), (0, (3.0, 4.0)), (0, (5.0, 6.0))]
+    assert gd.persistence_graphical_tools._array_handler(diags) == diags
+
+
+def test_min_birth_max_death():
+    diags = [
+        (0, (0.0, float("inf"))),
+        (0, (0.0983494, float("inf"))),
+        (0, (0.0, 0.122545)),
+        (0, (0.0, 0.12047)),
+        (0, (0.0, 0.118398)),
+        (0, (0.118398, 1.0)),
+        (0, (0.0, 0.117908)),
+        (0, (0.0, 0.112307)),
+        (0, (0.0, 0.107535)),
+        (0, (0.0, 0.106382)),
+    ]
+    assert gd.persistence_graphical_tools.__min_birth_max_death(diags) == (0.0, 1.0)
+    assert gd.persistence_graphical_tools.__min_birth_max_death(diags, band=4.0) == (0.0, 5.0)
+
+
+def test_limit_min_birth_max_death():
+    diags = [
+        (0, (2.0, float("inf"))),
+        (0, (2.0, float("inf"))),
+    ]
+    assert gd.persistence_graphical_tools.__min_birth_max_death(diags) == (2.0, 3.0)
+    assert gd.persistence_graphical_tools.__min_birth_max_death(diags, band=4.0) == (2.0, 6.0)
+
+
+def test_limit_to_max_intervals():
+    diags = [
+        (0, (0.0, float("inf"))),
+        (0, (0.0983494, float("inf"))),
+        (0, (0.0, 0.122545)),
+        (0, (0.0, 0.12047)),
+        (0, (0.0, 0.118398)),
+        (0, (0.118398, 1.0)),
+        (0, (0.0, 0.117908)),
+        (0, (0.0, 0.112307)),
+        (0, (0.0, 0.107535)),
+        (0, (0.0, 0.106382)),
+    ]
+    # check no warnings if max_intervals equals to the diagrams number
+    with warnings.catch_warnings():
+        warnings.simplefilter("error")
+        truncated_diags = gd.persistence_graphical_tools._limit_to_max_intervals(
+            diags, 10, key=lambda life_time: life_time[1][1] - life_time[1][0]
+        )
+        # check diagrams are not sorted
+        assert truncated_diags == diags
+
+    # check warning if max_intervals lower than the diagrams number
+    with pytest.warns(UserWarning) as record:
+        truncated_diags = gd.persistence_graphical_tools._limit_to_max_intervals(
+            diags, 5, key=lambda life_time: life_time[1][1] - life_time[1][0]
+        )
+        # check diagrams are truncated and sorted by life time
+        assert truncated_diags == [
+            (0, (0.0, float("inf"))),
+            (0, (0.0983494, float("inf"))),
+            (0, (0.118398, 1.0)),
+            (0, (0.0, 0.122545)),
+            (0, (0.0, 0.12047)),
+        ]
+    assert len(record) == 1
+
+
+def _limit_plot_persistence(function):
+    pplot = function(persistence=[])
+    assert isinstance(pplot, plt.axes.SubplotBase)
+    pplot = function(persistence=[], legend=True)
+    assert isinstance(pplot, plt.axes.SubplotBase)
+    pplot = function(persistence=[(0, float("inf"))])
+    assert isinstance(pplot, plt.axes.SubplotBase)
+    pplot = function(persistence=[(0, float("inf"))], legend=True)
+    assert isinstance(pplot, plt.axes.SubplotBase)
+
+
+def test_limit_plot_persistence():
+    for function in [gd.plot_persistence_barcode, gd.plot_persistence_diagram, gd.plot_persistence_density]:
+        _limit_plot_persistence(function)
+
+
+def _non_existing_persistence_file(function):
+    with pytest.raises(FileNotFoundError):
+        function(persistence_file="pouetpouettralala.toubiloubabdou")
+
+
+def test_non_existing_persistence_file():
+    for function in [gd.plot_persistence_barcode, gd.plot_persistence_diagram, gd.plot_persistence_density]:
+        _non_existing_persistence_file(function)