diff --git a/test_files/boolean_formats.xlsx b/test_files/boolean_formats.xlsx
index a7b35b9..c80f17b 100644
Binary files a/test_files/boolean_formats.xlsx and b/test_files/boolean_formats.xlsx differ
diff --git a/test_files/date_formats.xlsx b/test_files/date_formats.xlsx
index 58eb0a8..6b4969e 100644
Binary files a/test_files/date_formats.xlsx and b/test_files/date_formats.xlsx differ
diff --git a/test_files/gen_test_files.py b/test_files/gen_test_files.py
index 0394cbe..e35e654 100644
--- a/test_files/gen_test_files.py
+++ b/test_files/gen_test_files.py
@@ -17,7 +17,7 @@ def generate_number_formats_test():
         ]
     })
     
-    writer = pd.ExcelWriter('number_formats.xlsx', engine='xlsxwriter')
+    writer = pd.ExcelWriter('test_files/number_formats.xlsx', engine='xlsxwriter')
     df.to_excel(writer, index=False, sheet_name='Sheet1')
     
     # Get workbook and worksheet objects
@@ -49,7 +49,7 @@ def generate_date_formats_test():
         ]
     })
     
-    writer = pd.ExcelWriter('date_formats.xlsx', engine='xlsxwriter')
+    writer = pd.ExcelWriter('test_files/date_formats.xlsx', engine='xlsxwriter')
     df.to_excel(writer, index=False, sheet_name='Sheet1')
     
     workbook = writer.book
@@ -92,7 +92,7 @@ def generate_special_values_test():
         ]
     })
     
-    writer = pd.ExcelWriter('special_values.xlsx', engine='xlsxwriter')
+    writer = pd.ExcelWriter('test_files/special_values.xlsx', engine='xlsxwriter')
     df.to_excel(writer, index=False, sheet_name='Sheet1')
     writer.close()
 
@@ -111,7 +111,7 @@ def generate_precision_test():
         ]
     })
     
-    writer = pd.ExcelWriter('precision.xlsx', engine='xlsxwriter')
+    writer = pd.ExcelWriter('test_files/precision.xlsx', engine='xlsxwriter')
     df.to_excel(writer, index=False, sheet_name='Sheet1')
     
     workbook = writer.book
@@ -150,7 +150,7 @@ def generate_string_formats_test():
         ]
     })
     
-    writer = pd.ExcelWriter('string_formats.xlsx', engine='xlsxwriter')
+    writer = pd.ExcelWriter('test_files/string_formats.xlsx', engine='xlsxwriter')
     df.to_excel(writer, index=False, sheet_name='Sheet1')
     
     workbook = writer.book
@@ -173,7 +173,7 @@ def generate_boolean_formats_test():
         ]
     })
     
-    writer = pd.ExcelWriter('boolean_formats.xlsx', engine='xlsxwriter')
+    writer = pd.ExcelWriter('test_files/boolean_formats.xlsx', engine='xlsxwriter')
     df.to_excel(writer, index=False, sheet_name='Sheet1')
     
     workbook = writer.book
diff --git a/test_files/number_formats.xlsx b/test_files/number_formats.xlsx
index c1d477d..6b2af32 100644
Binary files a/test_files/number_formats.xlsx and b/test_files/number_formats.xlsx differ
diff --git a/test_files/precision.xlsx b/test_files/precision.xlsx
index d24693b..9e3f999 100644
Binary files a/test_files/precision.xlsx and b/test_files/precision.xlsx differ
diff --git a/test_files/special_values.xlsx b/test_files/special_values.xlsx
index e6934e0..1cbc9af 100644
Binary files a/test_files/special_values.xlsx and b/test_files/special_values.xlsx differ
diff --git a/test_files/string_formats.xlsx b/test_files/string_formats.xlsx
index 3164982..6817982 100644
Binary files a/test_files/string_formats.xlsx and b/test_files/string_formats.xlsx differ