diff --git a/mathics/builtin/files_io/importexport.py b/mathics/builtin/files_io/importexport.py
index 8f70ca7f3..176d34dbd 100644
--- a/mathics/builtin/files_io/importexport.py
+++ b/mathics/builtin/files_io/importexport.py
@@ -1092,7 +1092,7 @@ class RegisterImport(Builtin):
 
     def apply(self, formatname, function, posts, evaluation, options):
         """ImportExport`RegisterImport[formatname_String, function_, posts_,
-                OptionsPattern[ImportExport`RegisterImport]]"""
+        OptionsPattern[ImportExport`RegisterImport]]"""
 
         if function.has_form("List", None):
             leaves = function.get_leaves()
@@ -1174,7 +1174,7 @@ class RegisterExport(Builtin):
 
     def apply(self, formatname, function, evaluation, options):
         """ImportExport`RegisterExport[formatname_String, function_,
-                OptionsPattern[ImportExport`RegisterExport]]"""
+        OptionsPattern[ImportExport`RegisterExport]]"""
         EXPORTERS[formatname.get_string_value()] = (function, options)
 
         return Symbol("Null")
@@ -1704,41 +1704,6 @@ class Export(Builtin):
 
     ## FORMATS
 
-    ## Text
-    #> Export["abc.txt", 1 + x + y]
-     = abc.txt
-    #> FilePrint[%]
-     | 1 + x + y
-    #> DeleteFile[%%]
-
-    #> Export["abc.txt", "ä", CharacterEncoding -> "ISOLatin1"];
-    #> strm = OpenRead["abc.txt", BinaryFormat -> True];
-    #> BinaryRead[strm]
-     = 195
-    #> Close[strm];
-    #> DeleteFile["abc.txt"];
-
-    #> Export["abc.txt", "ä", CharacterEncoding -> "UTF-8"];
-    #> strm = OpenRead["abc.txt", BinaryFormat -> True];
-    #> BinaryRead[strm]
-     = 195
-    #> Close[strm];
-    #> DeleteFile["abc.txt"];
-
-    ## CSV
-    #> Export["abc.csv", {{1, 2, 3}, {4, 5, 6}}]
-     = abc.csv
-    #> FilePrint[%]
-     | 1,2,3
-     | 4,5,6
-    #> DeleteFile[%%]
-
-    ## SVG
-    #> Export["sine.svg", Plot[Sin[x], {x,0,1}]]
-     = sine.svg
-    #> FileFormat[%]
-     = SVG
-    #> DeleteFile[%%]
     """
 
     messages = {
@@ -2193,12 +2158,6 @@ class B64Encode(Builtin):
      = Integrate[f[x], {x, 0, 2}]
     """
 
-    # mmatera: please put in pytest conditionally
-    # >> System`Convert`B64Dump`B64Encode["∫ f  x"]
-    #  = 4oirIGYg752MIHg=
-    # >> System`Convert`B64Dump`B64Decode[%]
-    #  = ∫ f  x
-
     context = "System`Convert`B64Dump`"
     name = "B64Encode"
 
diff --git a/test/test_datentime.py b/test/test_datentime.py
index a512282c0..b993473ae 100644
--- a/test/test_datentime.py
+++ b/test/test_datentime.py
@@ -54,7 +54,7 @@ def test_datelist():
         check_evaluation(str_expr, str_expected)
 
 
-def test_datelist():
+def test_datestring():
     for str_expr, str_expected in (
         ## Check Leading 0s
         # (
diff --git a/test/test_importexport.py b/test/test_importexport.py
index 0c9c04e9e..4203c5d5c 100644
--- a/test/test_importexport.py
+++ b/test/test_importexport.py
@@ -1,5 +1,9 @@
 # -*- coding: utf-8 -*-
-from .helper import check_evaluation
+import tempfile
+import os
+import os.path as osp
+import sys
+from .helper import check_evaluation, session
 
 
 def test_import():
@@ -12,3 +16,49 @@ def test_import():
         ),
     ):
         check_evaluation(str_expr, str_expected, message)
+
+def run_export(temp_dirname: str, short_name: str, file_data:str, character_encoding):
+    file_path = osp.join(temp_dirname, short_name)
+    expr = fr'Export["{file_path}", {file_data}'
+    expr += ', CharacterEncoding -> "{character_encoding}"' if character_encoding else ""
+    expr += "]"
+    result = session.evaluate(expr)
+    assert result.to_python(string_quotes=False) == file_path
+    return file_path
+
+def check_data(temp_dirname: str, short_name: str, file_data:str,
+               character_encoding=None, expected_data=None):
+    file_path = run_export(temp_dirname, short_name, fr'"{file_data}"', character_encoding)
+    if expected_data is None:
+        expected_data = file_data
+    assert open(file_path, "r").read() == expected_data
+
+
+# Github Action Windows CI servers have problems with releasing files using
+# a tempfile.TemporaryDirectory context manager.
+# Leave out until we figure how to work around this.
+if not (os.environ.get("CI", False) or sys.platform in ("win32",)):
+    def test_export():
+        with tempfile.TemporaryDirectory(prefix="mtest-") as temp_dirname:
+            # Check exporting text files (file extension ".txt")
+            check_data(temp_dirname, "add_expr.txt", "1 + x + y")
+            check_data(temp_dirname, "AAcute.txt", "\u00C1", "ISOLatin1")
+            check_data(temp_dirname, "AAcuteUTF.txt", "\u00C1", "UTF-8")
+
+            # Check exporting CSV files (file extension ".csv")
+            file_path = run_export(temp_dirname, "csv_list.csv", "{{1, 2, 3}, {4, 5, 6}}", None)
+            assert open(file_path, "r").read() == "1,2,3\n4,5,6"
+
+            # Check exporting SVG files (file extension ".svg")
+            file_path = run_export(temp_dirname, "sine.svg", "Plot[Sin[x], {x,0,1}]", None)
+            data = open(file_path, "r").read().strip()
+            if not os.environ.get("CI", None):
+                assert data.startswith("<svg")
+                assert data.endswith("</svg>")
+
+# TODO:
+# mmatera: please put in pytest conditionally
+# >> System`Convert`B64Dump`B64Encode["∫ f  x"]
+#  = 4oirIGYg752MIHg=
+# >> System`Convert`B64Dump`B64Decode[%]
+#  = ∫ f  x