attempt to fix unit tests

Author: AhmedBasem20

utilities/reduce_output_size.py

@@ -1,14 +1,19 @@
 import pandas as pd
+import os
 
-df = pd.read_csv('test_output.csv')
+file_path = 'test_output.csv'
 
-# Columns to be rounded to four decimal places
-columns_to_round = ['f', 'Dp', 'D', 'f_fitted', 'Dp_fitted', 'D_fitted']
-for column in columns_to_round:
-    df[column] = df[column].round(4)
+# Check if the file exists
+if os.path.exists(file_path):
+    df = pd.read_csv(file_path)
 
-#drop b_values columns.
-df = df.loc[:, ~df.columns.str.startswith('bval')] 
+    # Columns to be rounded to four decimal places
+    columns_to_round = ['f', 'Dp', 'D', 'f_fitted', 'Dp_fitted', 'D_fitted']
+    for column in columns_to_round:
+        df[column] = df[column].round(4)
 
-#compress and save the file.
-df.to_csv('test_output.csv.gz', compression='gzip', index=False)
+    #drop b_values columns.
+    df = df.loc[:, ~df.columns.str.startswith('bval')] 
+
+    #compress and save the file.
+    df.to_csv('test_output.csv.gz', compression='gzip', index=False)