diff --git a/tests/test_preprocessing.py b/tests/test_preprocessing.py
index 402afb2..9189515 100644
--- a/tests/test_preprocessing.py
+++ b/tests/test_preprocessing.py
@@ -1,53 +1,35 @@
-import math
-
-import matplotlib.pyplot as plt
-import numpy as np
-import pytest
-
-from cleedpy.preprocessing import lorentzian_smoothing, preprocessing_loop
-from tests.curves_helper import curve_a, curve_a_smoothed, curve_b
-
-
-@pytest.mark.parametrize(
-    "curve, vi, expected",
-    [
-        (np.array(curve_a()), 4, np.array(curve_a_smoothed())),
-    ],
-)
-def test_lorentzian_smoothing(curve, vi, expected):
-    l_curve = lorentzian_smoothing(curve, vi)
-
-    x_values = curve[:, 0]
-    y_values = curve[:, 1]
-    plt.plot(x_values, y_values, marker="o", color="g", label="Input: Initial curve")
-
-    x_values = l_curve[:, 0]
-    y_values = l_curve[:, 1]
-    plt.plot(x_values, y_values, marker="x", color="r", label="Output: Smoothed curve")
-
-    y_min = 0
-    y_max = 0.0110
-    y_step = 0.0005
-    plt.ylim(y_min, y_max)
-    plt.yticks(np.arange(y_min, y_max + y_step, y_step))
-    plt.grid()
-    plt.legend()
-    plt.savefig("test_lorentzian_smoothing_output.png")
-
-    assert np.allclose(expected, l_curve)
-
-
-@pytest.mark.parametrize(
-    "the_curve, exp_curve, shift, r_factor, vi, expected",
-    [
-        ([curve_a(), curve_b()], [curve_a(), curve_b()], 1, "r2_factor", 4, 0),
-    ],
-)
-def test_preprocessing_loop(the_curve, exp_curve, shift, r_factor, vi, expected):
-    assert math.isclose(
-        expected,
-        preprocessing_loop(
-            np.array(the_curve), np.array(exp_curve), shift, r_factor, vi
-        ),
-        abs_tol=5,
-    )
+import matplotlib.pyplot as plt
+import numpy as np
+import pytest
+
+from cleedpy.preprocessing import lorentzian_smoothing
+from tests.curves_helper import curve_a, curve_a_smoothed
+
+
+@pytest.mark.parametrize(
+    "curve, vi, expected",
+    [
+        (np.array(curve_a()), 4, np.array(curve_a_smoothed())),
+    ],
+)
+def test_lorentzian_smoothing(curve, vi, expected):
+    l_curve = lorentzian_smoothing(curve, vi)
+
+    x_values = curve[:, 0]
+    y_values = curve[:, 1]
+    plt.plot(x_values, y_values, marker="o", color="g", label="Input: Initial curve")
+
+    x_values = l_curve[:, 0]
+    y_values = l_curve[:, 1]
+    plt.plot(x_values, y_values, marker="x", color="r", label="Output: Smoothed curve")
+
+    y_min = 0
+    y_max = 0.0110
+    y_step = 0.0005
+    plt.ylim(y_min, y_max)
+    plt.yticks(np.arange(y_min, y_max + y_step, y_step))
+    plt.grid()
+    plt.legend()
+    plt.savefig("test_lorentzian_smoothing_output.png")
+
+    assert np.allclose(expected, l_curve)