diff --git a/.gitignore b/.gitignore
index 90f8fbb..cb5660a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -161,7 +161,7 @@ cython_debug/
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
+.idea/
 
 ### Python Patch ###
 # Poetry local configuration file - https://python-poetry.org/docs/configuration/#local-configuration
diff --git a/arithmetic_formatter/__init__.py b/arithmetic_formatter/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/arithmetic_formatter/tests.py b/arithmetic_formatter/test_formatter.py
similarity index 97%
rename from arithmetic_formatter/tests.py
rename to arithmetic_formatter/test_formatter.py
index 254ec0b..d5d5b90 100644
--- a/arithmetic_formatter/tests.py
+++ b/arithmetic_formatter/test_formatter.py
@@ -6,6 +6,7 @@
 
 
 class UnitTests(unittest.TestCase):
+
     @parameterized.expand([
         param(name="test_two_problems_arrangement1",
               args=[['3801 - 2', '123 + 49']],
@@ -59,7 +60,8 @@ class UnitTests(unittest.TestCase):
               msg='Expected solutions to be correctly displayed in output when calling "arithmetic_arranger()" with '
                   'five arithmetic problems and a second argument of `True`.')
     ])
-    def test_arithmetic_formatter(self, name: str, args: List[Union[List[str], Optional[bool]]], expected: str, msg: str):
+    def test_arithmetic_formatter(self, name: str, args: List[Union[List[str], Optional[bool]]], expected: str,
+                                  msg: str):
         actual: str = formatter(*args)
         self.assertEqual(actual, expected, msg)
 
diff --git a/budget_app/__init__.py b/budget_app/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/budget_app/tests.py b/budget_app/test_budget.py
similarity index 99%
rename from budget_app/tests.py
rename to budget_app/test_budget.py
index 05f2e38..97b5c0b 100644
--- a/budget_app/tests.py
+++ b/budget_app/test_budget.py
@@ -1,6 +1,6 @@
 import unittest
 
-from budget import Category, create_spend_chart
+from budget_app.budget import Category, create_spend_chart
 
 
 class UnitTests(unittest.TestCase):
diff --git a/polygon_area_calculator/__init__.py b/polygon_area_calculator/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/polygon_area_calculator/tests.py b/polygon_area_calculator/test_polygon_area_calc.py
similarity index 98%
rename from polygon_area_calculator/tests.py
rename to polygon_area_calculator/test_polygon_area_calc.py
index 8334900..2d603d2 100644
--- a/polygon_area_calculator/tests.py
+++ b/polygon_area_calculator/test_polygon_area_calc.py
@@ -1,6 +1,6 @@
 import unittest
 
-from calculator import Rectangle, Square
+from polygon_area_calculator.calculator import Rectangle, Square
 
 
 class UnitTests(unittest.TestCase):
diff --git a/probability_calculator/__init__.py b/probability_calculator/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/probability_calculator/tests.py b/probability_calculator/test_prob_calc.py
similarity index 96%
rename from probability_calculator/tests.py
rename to probability_calculator/test_prob_calc.py
index 3a147e5..daaccd3 100644
--- a/probability_calculator/tests.py
+++ b/probability_calculator/test_prob_calc.py
@@ -1,6 +1,6 @@
 import unittest
 
-from calculator import Hat, experiment
+from probability_calculator.calculator import Hat, experiment
 
 
 class UnitTests(unittest.TestCase):
diff --git a/time_calculator/__init__.py b/time_calculator/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/time_calculator/tests.py b/time_calculator/test_time_calc.py
similarity index 100%
rename from time_calculator/tests.py
rename to time_calculator/test_time_calc.py