Fix further case of Path vs MockPopen

testfixtures/popen.py

@@ -22,7 +22,9 @@ def shell_join(command: Command) -> str:
     elif isinstance(command, Iterable):
         quoted_parts = []
         for part in command:
-            if not isinstance(part, str):
+            if isinstance(part, PathLike):
+                part = str(part)
+            elif not isinstance(part, str):
                 raise TypeError(f'{part!r} in {command} was {type(part)}, must be str')
             quoted_parts.append(shlex.quote(part))
         return " ".join(quoted_parts)

testfixtures/tests/test_popen.py

@@ -103,6 +103,18 @@ def test_command_is_incorrect_type(self):
         with ShouldRaise(TypeError("42 was <class 'int'>, must be str")):
             Popen(42)
 
+    def test_command_is_sequence_of_pathlike(self):
+        Popen = MockPopen()
+        Popen.set_command('a command')
+
+        process = Popen(['a', Path('command')])
+
+        compare(process.wait(), 0)
+        compare([
+                call.Popen(['a', Path('command')]),
+                call.Popen_instance.wait(),
+                ], Popen.mock.method_calls)
+
     def test_command_is_sequence_of_incorrect_type(self):
         Popen = MockPopen()
         Popen.set_command('a command')