diff --git a/experiment/trend_analysis/univariate_test/extreme_trend_test/trend_test_one_parameter/gumbel_trend_test_one_parameter.py b/experiment/trend_analysis/univariate_test/extreme_trend_test/trend_test_one_parameter/gumbel_trend_test_one_parameter.py
index 927b7371fd0822e1c002d66a69bc8b0aabe5e950..0d0ff69abfbf7a8024915a0ea254949662563f38 100644
--- a/experiment/trend_analysis/univariate_test/extreme_trend_test/trend_test_one_parameter/gumbel_trend_test_one_parameter.py
+++ b/experiment/trend_analysis/univariate_test/extreme_trend_test/trend_test_one_parameter/gumbel_trend_test_one_parameter.py
@@ -59,6 +59,7 @@ class GevStationaryVersusGumbel(GevTrendTestOneParameter):
     def marker(self):
         return 'X'
 
+
 class GumbelLocationTrendTest(GevTrendTestOneParameterAgainstStationary):
 
     def __init__(self, years, maxima, starting_year, quantile_level=EUROCODE_QUANTILE):
@@ -109,4 +110,4 @@ class GumbelScaleTrendTest(GevTrendTestOneParameterAgainstStationary):
 
     @classproperty
     def marker(self):
-        return 11
\ No newline at end of file
+        return 11
diff --git a/extreme_fit/model/margin_model/linear_margin_model/temporal_linear_margin_models.py b/extreme_fit/model/margin_model/linear_margin_model/temporal_linear_margin_models.py
index 23be15751f9048bd74497c626c4c7fd3abc5b638..9a5ae312a68396b04f232e1452e44f1a0cc96adb 100644
--- a/extreme_fit/model/margin_model/linear_margin_model/temporal_linear_margin_models.py
+++ b/extreme_fit/model/margin_model/linear_margin_model/temporal_linear_margin_models.py
@@ -78,8 +78,10 @@ class GumbelTemporalModel(StationaryTemporalModel):
 class NonStationaryLocationGumbelModel(GumbelTemporalModel, NonStationaryLocationTemporalModel):
     pass
 
+
 class NonStationaryScaleGumbelModel(GumbelTemporalModel, NonStationaryScaleTemporalModel):
     pass
 
+
 class NonStationaryLocationAndScaleGumbelModel(GumbelTemporalModel, NonStationaryLocationAndScaleTemporalModel):
-    pass
\ No newline at end of file
+    pass
diff --git a/test/test_extreme_fit/test_model/test_confidence_interval.py b/test/test_extreme_fit/test_model/test_confidence_interval.py
index 1d8795c568a91f99262c2aace1b34841b5a7d783..6922b113e787b71ca3035de5775d2286571445a2 100644
--- a/test/test_extreme_fit/test_model/test_confidence_interval.py
+++ b/test/test_extreme_fit/test_model/test_confidence_interval.py
@@ -3,11 +3,16 @@ import unittest
 import numpy as np
 import pandas as pd
 
+from experiment.trend_analysis.univariate_test.extreme_trend_test.trend_test_one_parameter.gumbel_trend_test_one_parameter import \
+    GumbelLocationTrendTest
+from experiment.trend_analysis.univariate_test.extreme_trend_test.trend_test_two_parameters.gumbel_test_two_parameters import \
+    GumbelLocationAndScaleTrendTest
 from experiment.trend_analysis.univariate_test.utils import fitted_linear_margin_estimator
 from extreme_fit.model.margin_model.linear_margin_model.abstract_temporal_linear_margin_model import \
     TemporalMarginFitMethod
 from extreme_fit.model.margin_model.linear_margin_model.temporal_linear_margin_models import StationaryTemporalModel, \
-    NonStationaryLocationTemporalModel, NonStationaryLocationAndScaleTemporalModel
+    NonStationaryLocationTemporalModel, NonStationaryLocationAndScaleTemporalModel, \
+    NonStationaryLocationAndScaleGumbelModel, NonStationaryLocationGumbelModel
 from extreme_fit.model.result_from_model_fit.result_from_extremes.confidence_interval_method import \
     ConfidenceIntervalMethodFromExtremes
 from extreme_fit.model.result_from_model_fit.result_from_extremes.eurocode_return_level_uncertainties import \
@@ -80,6 +85,8 @@ class TestConfidenceInterval(unittest.TestCase):
             StationaryTemporalModel: (-4.703945484843988, 30.482318639674023, 65.66858276419204),
             NonStationaryLocationTemporalModel: (-30.361576509947707, 4.159940117114796, 38.6814567441773),
             NonStationaryLocationAndScaleTemporalModel: (-52.797816369170455, 6.0677087210572465, 64.93323381128495),
+            NonStationaryLocationGumbelModel: (8.61171183466113, 11.903294433157592, 15.194877031654055),
+            NonStationaryLocationAndScaleGumbelModel: (6.0605675256893, 10.512751341145462, 14.964935156601623),
         }
 
     def test_ci_boot(self):