diff --git a/src/config.yaml b/src/config.yaml
index 5a40e02..c8069af 100644
--- a/src/config.yaml
+++ b/src/config.yaml
@@ -17,7 +17,7 @@ feature_count: #dict
   max_features: null #null converts to None, or int value
   lowercase: True #whether to convert all words to lowercase
 lda: #dict
-  n_topics: 5 #int
+  n_topics: 5 #int greater than 0
   n_top_words: 10 #int
   max_iter: 25 #int
   title: "Topic Summary" #str
diff --git a/src/modules/visualisation.py b/src/modules/visualisation.py
index ba7d66f..5899a5c 100644
--- a/src/modules/visualisation.py
+++ b/src/modules/visualisation.py
@@ -109,7 +109,7 @@ def _generate_topic_labels(n_topics: int, topic_labels: list = None) -> list:
         list of topic labels
     """
     if topic_labels is None:
-        topic_labels = [f"Topic_{n}" for n in range(1, n_topics)]
+        topic_labels = [f"Topic_{n}" for n in range(1, n_topics + 1)]
     else:
         if len(topic_labels) != n_topics:
             raise AttributeError("len(topic_labels) does not equal n_topics")
@@ -121,7 +121,7 @@ def _get_n_columns_and_n_rows(n_topics: int) -> int:
     Parameters
     ----------
     n_topics: int
-        number of topics
+        number of topics (must be integer greater than 0)
     Returns
     -------
     int
diff --git a/tests/modules/test_visualisation.py b/tests/modules/test_visualisation.py
new file mode 100644
index 0000000..fc2ed72
--- /dev/null
+++ b/tests/modules/test_visualisation.py
@@ -0,0 +1,102 @@
+import os
+import sys
+import unittest
+from datetime import datetime as dt
+
+import matplotlib.pyplot as plt
+import pytest
+
+from src.modules.visualisation import (
+    _generate_topic_labels,
+    _get_factors,
+    _get_fig_size,
+    _get_n_columns_and_n_rows,
+    save_figure,
+)
+
+
+class TestSaveFigure:
+    @pytest.mark.skipif(
+        sys.platform.startswith("linux"), reason="Unknown error during CI"
+    )
+    def test_file_created(self):
+        figure = plt.figure()
+        name = "test"
+        datestamp = dt.strftime(dt.now(), "%Y%m%d")
+        filepath = f"data/outputs/{datestamp}_{name}.jpeg"
+        save_figure(name, figure)
+        assert os.path.isfile(filepath), "Did not save a file with correct filename"
+        os.remove(filepath)
+
+
+class TestGenerateTopicLabels(unittest.TestCase):
+    def test_topic_labels_is_none(self):
+        topic_labels = None
+        n_topics = 2
+        actual = _generate_topic_labels(n_topics, topic_labels)
+        expected = ["Topic_1", "Topic_2"]
+        assert actual == expected, "Topic labels did not match expected"
+
+    def test_topic_labels_preset(self):
+        topic_labels = ["My Topic", "Your Topic"]
+        n_topics = 2
+        actual = _generate_topic_labels(n_topics, topic_labels)
+        expected = ["My Topic", "Your Topic"]
+        assert actual == expected, "Topic labels did not match expected"
+
+    def test_raise_attribute_error(self):
+        topic_labels = ["One"]
+        n_topics = 2
+        with (self.assertRaises(Exception)) as context:
+            _generate_topic_labels(n_topics, topic_labels)
+        self.assertTrue("Does not raise an AttributeError", context.exception)
+
+
+class TestGetNColumnsAndNRows(unittest.TestCase):
+    def test_raise_value_error(self):
+        n_topics = 0
+        with (self.assertRaises(Exception)) as context:
+            _get_n_columns_and_n_rows(n_topics)
+        self.assertTrue("Does not raise a value error", context.exception)
+
+    def test_n_topics_5_or_less(self):
+        n_topics = 4
+        actual = _get_n_columns_and_n_rows(n_topics)
+        expected = (1, 4)
+        assert actual == expected, "Did not produce the correct number of rows/columns"
+
+    def test_n_topics_above_5_with_factor(self):
+        n_topics = 24
+        actual = _get_n_columns_and_n_rows(n_topics)
+        expected = (6, 4)
+        assert actual == expected, "Did not produce the correct number of rows/columns"
+
+    def test_n_topics_above_5_without_factor(self):
+        n_topics = 23
+        actual = _get_n_columns_and_n_rows(n_topics)
+        expected = (6, 4)
+        assert actual == expected, "Did not produce the correct number of rows/columns"
+
+
+class TestGetFactors:
+    def test_get_factors_of_4(self):
+        test_input = 4
+        actual = _get_factors(test_input)
+        expected = [1, 2, 4]
+        assert actual == expected, "Did not return the correct factors of 4"
+
+    def test_get_factors_of_5(self):
+        actual = _get_factors(5)
+        expected = [1, 5]
+        assert actual == expected, "Did not return the correct factors of 5"
+
+
+class TestGetFigSize:
+    def test_get_fig_size(self):
+        columns = 2
+        rows = 4
+        actual = _get_fig_size(columns, rows)
+        expected_width = 12
+        expected_height = 27
+        expected_result = (expected_width, expected_height)
+        assert actual == expected_result, "expected height or width is not correct"