Testing os emulation in pathlib

pyfakefs/tests/fake_pathlib_test.py

@@ -1337,6 +1337,83 @@ def test_posix_pure_path_parsing(self):
             pathlib.PurePosixPath(path).stem,
         )
 
+    def test_windows_pure_path_str(self):
+        """Verify faked pure Windows paths are formatted using windows separators"""
+        path = r"C:/Windows/cmd.exe"
+        self.assertEqual(
+            str(fake_pathlib.FakePathlibModule.PureWindowsPath(path)),
+            str(pathlib.PureWindowsPath(path)),
+        )
+
+    def test_posix_pure_path_str(self):
+        """Verify faked pure POSIX paths are formatted using POSIX separator."""
+
+        path = r"/bin/bash"
+        self.assertEqual(
+            str(fake_pathlib.FakePathlibModule.PurePosixPath(path)),
+            str(pathlib.PurePosixPath(path)),
+        )
+
+    def test_posix_pure_path_is_absolute(self):
+        """Verify faked pure POSIX paths are formatted using POSIX separator."""
+
+        path = r"/bin/bash"
+        self.assertEqual(
+            fake_pathlib.FakePathlibModule.PurePosixPath(path).is_absolute(),
+            pathlib.PurePosixPath(path).is_absolute(),
+        )
+        path = r"bin/bash"
+        self.assertEqual(
+            fake_pathlib.FakePathlibModule.PurePosixPath(path).is_absolute(),
+            pathlib.PurePosixPath(path).is_absolute(),
+        )
+        path = r"../bin/bash"
+        self.assertEqual(
+            fake_pathlib.FakePathlibModule.PurePosixPath(path).is_absolute(),
+            pathlib.PurePosixPath(path).is_absolute(),
+        )
+
+    def test_windows_pure_path_is_absolute(self):
+        """Verify faked pure POSIX paths are formatted using POSIX separator."""
+
+        path = r"C:/Windows/cmd.exe"
+        self.assertEqual(
+            fake_pathlib.FakePathlibModule.PureWindowsPath(path).is_absolute(),
+            pathlib.PureWindowsPath(path).is_absolute(),
+        )
+        path = r"./cmd.exe"
+        self.assertEqual(
+            fake_pathlib.FakePathlibModule.PureWindowsPath(path).is_absolute(),
+            pathlib.PureWindowsPath(path).is_absolute(),
+        )
+        path = r"../cmd.exe"
+        self.assertEqual(
+            fake_pathlib.FakePathlibModule.PureWindowsPath(path).is_absolute(),
+            pathlib.PureWindowsPath(path).is_absolute(),
+        )
+
+
+class PureWindowsPath(FakePathlibModulePurePathTest, fake_filesystem_unittest.TestCase):
+    def setUp(self) -> None:
+        self.setUpPyfakefs()
+        self.fs.os = OSType.WINDOWS
+
+
+class FakePathlibModulePurePathTestMacos(
+    FakePathlibModulePurePathTest, fake_filesystem_unittest.TestCase
+):
+    def setUp(self) -> None:
+        self.setUpPyfakefs()
+        self.fs.os = OSType.MACOS
+
+
+class FakePathlibModulePurePathTestLinux(
+    FakePathlibModulePurePathTest, fake_filesystem_unittest.TestCase
+):
+    def setUp(self) -> None:
+        self.setUpPyfakefs()
+        self.fs.os = OSType.LINUX
+
 
 class SkipPathlibTest(fake_filesystem_unittest.TestCase):
     def setUp(self):