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diff --git a/tests/test_depth_inf/__init__.py b/tests/test_depth_inf/__init__.py
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diff --git a/tests/test_depth_inf/factorial.py b/tests/test_depth_inf/factorial.py
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+++ b/tests/test_depth_inf/factorial.py
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+#!/usr/bin/python3
+import pysnooper
+# test recursion
+@pysnooper.snoop(depth=float("inf"), color = False)
+def factorial(x):
+    """This is a recursive function
+    to find the factorial of an integer"""
+
+    if x == 1:
+        return 1
+    else:
+        return (x * factorial(x-1))
+
diff --git a/tests/test_depth_inf/test_depth_inf.py b/tests/test_depth_inf/test_depth_inf.py
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+++ b/tests/test_depth_inf/test_depth_inf.py
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+# Copyright 2019 Ram Rachum and collaborators.
+# This program is distributed under the MIT license.
+
+import io
+import textwrap
+import threading
+import types
+import os
+import sys
+
+from pysnooper.utils import truncate
+import pytest
+
+import pysnooper
+from pysnooper.variables import needs_parentheses
+from ..utils import (assert_output, assert_sample_output, VariableEntry,
+                    CallEntry, LineEntry, ReturnEntry, OpcodeEntry,
+                    ReturnValueEntry, ExceptionEntry, ExceptionValueEntry,
+                    SourcePathEntry, CallEndedByExceptionEntry,
+                    ElapsedTimeEntry)
+from .. import mini_toolbox
+from . import factorial
+
+
+def test_multiple_files():
+    with mini_toolbox.OutputCapturer(stdout=False,
+                                     stderr=True) as output_capturer:
+        result = factorial.factorial(3)
+    assert result == 6
+    output = output_capturer.string_io.getvalue()
+    assert_output(
+        output,
+        (
+            SourcePathEntry(source_path_regex=r'.*factorial\.py$'),
+            VariableEntry('x', '3'),
+            CallEntry(),
+            LineEntry(),
+            LineEntry(),
+            VariableEntry('x', '2'),
+            CallEntry(),
+            LineEntry(),
+            LineEntry(),
+            VariableEntry('x', '1'),
+            CallEntry(),
+            LineEntry(),
+            LineEntry(),
+            ReturnEntry(),
+            ReturnValueEntry('1'),
+            ElapsedTimeEntry(),
+            ReturnEntry(),
+            ReturnValueEntry('2'),
+            ElapsedTimeEntry(),
+            ReturnEntry(),
+            ReturnValueEntry('6'),
+            ElapsedTimeEntry()
+        )
+    )
+
+