Added a mock (not ideal) to test unicodedecodeerror

z3c/dependencychecker/tests/test_modules_docfiles.py

@@ -1,4 +1,5 @@
 from pathlib import Path
+from unittest import mock
 
 from z3c.dependencychecker.modules import DocFiles
 from z3c.dependencychecker.tests.utils import write_source_file_at
@@ -81,6 +82,20 @@ def test_create_from_files_deep_nested_txt(minimal_structure):
     assert len(modules_found) == 1
 
 
+def test_unicode_decode_error():
+    docfiles = DocFiles("somewhere", "some_file")
+    docfiles._scan = mock.MagicMock
+    # Thanks to
+    # https://gehrcke.de/2015/12/how-to-raise-unicodedecodeerror-in-python-3/
+    # for the error syntax :-)
+    o = b"\x00\x00"
+    docfiles._scan.side_effect = UnicodeDecodeError(
+        "funnycodec", o, 1, 2, "This is just a fake reason!"
+    )
+    # The unicode error logs an error but continues otherwise.
+    assert list(docfiles.scan()) == []
+
+
 def test_create_from_files_deep_nested_rst(minimal_structure):
     path, package_name = minimal_structure
     src_path = path / "src"