extmod/vfs_posix: Additional tests for coverage of error cases.

cwalther · cwalther · commit 7980261f0130 · 2023-08-02T13:15:21.000+02:00
Signed-off-by: Christian Walther &lt;cwalther@gmx.ch&gt;
diff --git a/tests/extmod/vfs_posix.py b/tests/extmod/vfs_posix.py
@@ -194,6 +194,49 @@ def write_files_without_closing():
 # restore CWD
 os.chdir(curdir)
 
+# test error cases with long paths
+if sys.platform == "win32":
+    # Windows doesn't let you change into a directory whose full path is too
+    # long, so this cannot be tested.
+    def testlongpath():
+        return True
+
+else:
+
+    def testlongpath():
+        longname = 62 * "long"
+        for n in range(300):
+            os.mkdir(longname)
+            os.chdir(longname)
+            try:
+                os.getcwd()
+            except OSError as e:
+                # expecting ERANGE from getcwd() after a few iterations, then we
+                # are in the situation to be tested
+                if e.errno == 34:
+                    break
+                else:
+                    print("getcwd():", repr(e))
+                    return False
+
+        try:
+            print(os.VfsPosix("something"))
+        except OSError as e:
+            # expecting ERANGE
+            if e.errno != 34:
+                print("VfsPosix():", repr(e))
+                return False
+
+        # clean up
+        for i in range(n + 1):
+            os.chdir("..")
+            os.rmdir(longname)
+
+        return True
+
+
+print("testlongpath():", testlongpath())
+
 # rmdir
 os.rmdir(temp_dir)
 print(temp_dir in os.listdir())
diff --git a/tests/extmod/vfs_posix.py.exp b/tests/extmod/vfs_posix.py.exp
@@ -35,5 +35,6 @@ chdir("/mnt/dir"): None
 getcwd(): /mnt/dir
 chdir(".."): None
 getcwd(): /mnt
+testlongpath(): True
 False
 rmdir OSError
