diff --git a/src/REF2021_processing/process_submissions_and_results.py b/src/REF2021_processing/process_submissions_and_results.py
index 606a145..c4e0e40 100644
--- a/src/REF2021_processing/process_submissions_and_results.py
+++ b/src/REF2021_processing/process_submissions_and_results.py
@@ -238,11 +238,12 @@ def preprocess_impacts(dset):
     return dset
 
 
-def preprocess_sheet(source):
+def preprocess_sheet(source, output_path):
     """Preprocess a sheet from the raw data.
 
     Args:
         sname (str): Name of the sheet to preprocess.
+        output_path (str): Path to save the pre-processed data.
     """
 
     # set the input excel file name and index
@@ -304,7 +305,7 @@ def preprocess_sheet(source):
     # set the index name and save the pre-processed data
     dset.index.name = "Record"
     rw.export_dataframe(
-        dset, os.path.join(rw.SOURCES["submissions"]["output_path"], sname), sname
+        dset, os.path.join(output_path, sname), sname
     )
 
 
@@ -336,14 +337,16 @@ def preprocess_sheet(source):
 
     if source_name == "results":
         SHEET_NAME = rw.SOURCES["results"]["sheet"]
+        OUTPUT_PATH = rw.SOURCES["results"]["output_path"]
     else:
         SHEET_NAME = rw.SOURCES["submissions"]["sheets"][source_name]
+        OUTPUT_PATH = rw.SOURCES["submissions"]["output_path"]
 
     STATUS = utils.setup_logger(SHEET_NAME, verbose=args.verbose)
 
     # run pre-processing
     if STATUS:
-        preprocess_sheet(source_name)
+        preprocess_sheet(source_name, OUTPUT_PATH)
     else:
         print(f"{utils.FAILED_ICON} failed: setup logger")
 
diff --git a/src/REF2021_processing/read_write.py b/src/REF2021_processing/read_write.py
index 2825d74..9080fa7 100644
--- a/src/REF2021_processing/read_write.py
+++ b/src/REF2021_processing/read_write.py
@@ -48,6 +48,7 @@
         "filename": "REF-2021-Results-All-2022-05-06.xlsx",
         "header_index": 6,
         "sheet": "Results",
+        "output_path": "data/processed/sheets/"
     },
 }
 
diff --git a/tests/folders_and_files_test.py b/tests/folders_and_files_test.py
index bc1aae8..093ce31 100644
--- a/tests/folders_and_files_test.py
+++ b/tests/folders_and_files_test.py
@@ -3,16 +3,97 @@
 import REF2021_processing.read_write as rw
 
 
-def test_log_folder_exists():
-    """Test if the log folder exists."""
+# Submissions
+# ===========
+def test_process_submissions_logs_exist():
+    """Test if the logs files for submissions exist."""
 
-    fpath = rw.LOGS["path"]
-    assert os.path.exists(fpath), f"{fpath} does not exist"
+    for sheet in rw.SOURCES["submissions"]["sheets"].values():
+        fpath = f"{rw.LOGS['path']}{sheet}{rw.LOGS['extension']}"
+        assert os.path.exists(fpath), f"{fpath} does not exist"
 
 
-def test_process_submissions_logs_exist():
-    """Test if the logs files for submissions exist."""
+def test_process_submissions_logs_empty():
+    """Test if the logs files for submissions are empty."""
 
     for sheet in rw.SOURCES["submissions"]["sheets"].values():
         fpath = f"{rw.LOGS['path']}{sheet}{rw.LOGS['extension']}"
+        assert not os.path.getsize(fpath) == 0, f"{fpath} is empty"
+
+
+def test_process_submissions_output_exist():
+    """Test if the processed files for submissions exist."""
+
+    for sheet in rw.SOURCES["submissions"]["sheets"].values():
+        fpath = (
+            f"{rw.SOURCES['submissions']['output_path']}{sheet}{rw.OUTPUT_EXTENSION}"
+        )
         assert os.path.exists(fpath), f"{fpath} does not exist"
+
+
+def test_process_submissions_output_empty():
+    """Test if the processed files for submissions are empty."""
+
+    for sheet in rw.SOURCES["submissions"]["sheets"].values():
+        fpath = (
+            f"{rw.SOURCES['submissions']['output_path']}{sheet}{rw.OUTPUT_EXTENSION}"
+        )
+        assert not os.path.getsize(fpath) == 0, f"{fpath} is empty"
+
+
+# Results
+# =======
+# Results logs
+def test_process_results_logs_exist():
+    """Test if the logs files for results exist."""
+
+    sheet = rw.SOURCES["results"]["sheet"]
+    fpath = f"{rw.LOGS['path']}{sheet}{rw.LOGS['extension']}"
+    assert os.path.exists(fpath), f"{fpath} does not exist"
+
+
+def test_process_results_logs_empty():
+    """Test if the logs files for results are empty."""
+
+    sheet = rw.SOURCES["results"]["sheet"]
+    fpath = f"{rw.LOGS['path']}{sheet}{rw.LOGS['extension']}"
+    assert not os.path.getsize(fpath) == 0, f"{fpath} is empty"
+
+
+# Results output
+def test_process_results_output_exist():
+    """Test if the processed files for results exist."""
+
+    fpath = (
+        f"{rw.SOURCES['results']['output_path']}"
+        f"{rw.SOURCES['results']['sheet']}{rw.OUTPUT_EXTENSION}"
+    )
+    assert os.path.exists(fpath), f"{fpath} does not exist"
+
+
+def test_process_results_output_empty():
+    """Test if the processed files for results are empty."""
+
+    fpath = (
+        f"{rw.SOURCES['results']['output_path']}"
+        f"{rw.SOURCES['results']['sheet']}{rw.OUTPUT_EXTENSION}"
+    )
+    assert not os.path.getsize(fpath) == 0, f"{fpath} is empty"
+
+
+# Environment statements
+# =======================
+def test_process_environment_statements_logs_exist():
+    """Test if the logs files for environment statements exist."""
+
+    for _, config in rw.SOURCES["environment_statements"].items():
+        fpath = f"{rw.LOGS['path']}{config['name']}{rw.LOGS['extension']}"
+        assert os.path.exists(fpath), f"{fpath} does not exist"
+
+
+def test_process_environment_statements_logs_empty():
+    """Test if the logs files for environment statements are empty."""
+
+    for _, config in rw.SOURCES["environment_statements"].items():
+        fpath = f"{rw.LOGS['path']}{config['name']}{rw.LOGS['extension']}"
+        assert not os.path.getsize(fpath) == 0, f"{fpath} is empty"