diff --git a/tests/fixtures/utilities/flutter_mach.txt b/tests/fixtures/utilities/flutter_mach.txt
new file mode 100644
index 000000000..675072670
--- /dev/null
+++ b/tests/fixtures/utilities/flutter_mach.txt
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diff --git a/tests/fixtures/utilities/flutter_safety_factor.txt b/tests/fixtures/utilities/flutter_safety_factor.txt
new file mode 100644
index 000000000..d16f406a6
--- /dev/null
+++ b/tests/fixtures/utilities/flutter_safety_factor.txt
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diff --git a/tests/unit/test_utilities.py b/tests/unit/test_utilities.py
index aeb374db6..68dbc3d7f 100644
--- a/tests/unit/test_utilities.py
+++ b/tests/unit/test_utilities.py
@@ -3,7 +3,7 @@
 import numpy as np
 import pytest
 
-from rocketpy import utilities
+from rocketpy import Function, utilities
 
 
 @pytest.mark.parametrize(
@@ -132,35 +132,77 @@ def test_liftoff_by_mass(mock_show, flight):
     assert f.plot() == None
 
 
-@pytest.mark.skip(reason="legacy tests")
-@patch("matplotlib.pyplot.show")
-def test_fin_flutter_analysis(mock_show, flight):
+def test_fin_flutter_analysis(flight_calisto_custom_wind):
     """Tests the fin_flutter_analysis function. It tests the both options of
     the see_graphs parameter.
     Parameters
     ----------
-    flight : rocketpy.Flight
+    flight_calisto_custom_wind : Flight
         A Flight object with a rocket with fins. This flight object was created
         in the conftest.py file.
     """
     flutter_mach, safety_factor = utilities.fin_flutter_analysis(
         fin_thickness=2 / 1000,
         shear_modulus=10e9,
-        flight=flight,
+        flight=flight_calisto_custom_wind,
+        see_prints=False,
         see_graphs=False,
     )
+    assert np.isclose(flutter_mach(0), 1.00482, atol=5e-3)
+    assert np.isclose(flutter_mach(10), 1.1413572089696549, atol=5e-3)
+    assert np.isclose(flutter_mach(np.inf), 1.0048188594647927, atol=5e-3)
+    assert np.isclose(safety_factor(0), 64.78797, atol=5e-3)
+    assert np.isclose(safety_factor(10), 2.1948620401502072, atol=5e-3)
+    assert np.isclose(safety_factor(np.inf), 65.40588722032527, atol=5e-3)
 
-    assert abs(flutter_mach(15) - 1.085461074199555) < 1e-3
-    assert abs(safety_factor(15) - 3.364511241274865) < 1e-3
+
+def test_flutter_prints(flight_calisto_custom_wind):
+    """Tests the _flutter_prints function.
+
+    Parameters
+    ----------
+    flight_calisto_custom_wind : Flight
+        A Flight object with a rocket with fins. This flight object was created
+        in the conftest.py file.
+    """
+    flutter_mach = Function("tests/fixtures/utilities/flutter_mach.txt")
+    safety_factor = Function("tests/fixtures/utilities/flutter_safety_factor.txt")
     assert (
-        utilities.fin_flutter_analysis(
+        utilities._flutter_prints(  # pylint: disable=protected-access
             fin_thickness=2 / 1000,
             shear_modulus=10e9,
-            flight=flight,
-            see_graphs=True,
+            s=0.009899999999999999,
+            ar=1.2222222222222223,
+            la=0.5,
+            flutter_mach=flutter_mach,
+            safety_factor=safety_factor,
+            flight=flight_calisto_custom_wind,
         )
-        == None
-    )
+        is None
+    ), "An error occurred while running the utilities._flutter_prints function."
+
+
+@patch("matplotlib.pyplot.show")
+def test_flutter_plots(mock_show, flight_calisto_custom_wind):
+    """Tests the _flutter_plots function.
+
+    Parameters
+    ----------
+    mock_show : mock
+        Mock of the matplotlib.pyplot.show function. This is here so the plots
+        are not shown during the tests.
+    flight_calisto_custom_wind : Flight
+        A Flight object with a rocket with fins. This flight object was created
+        in the conftest.py file.
+    """
+    flutter_mach = Function("tests/fixtures/utilities/flutter_mach.txt")
+    safety_factor = Function("tests/fixtures/utilities/flutter_safety_factor.txt")
+    assert (
+        utilities._flutter_plots(  # pylint: disable=protected-access
+            flight_calisto_custom_wind, flutter_mach, safety_factor
+        )
+        is None
+    ), "An error occurred while running the utilities._flutter_plots function."
 
 
 def test_get_instance_attributes(flight_calisto_robust):