Fix #7980: Add detailed error messages with installation suggestions for image writers, cleanup tests

Author: iloveme81189-del

test_env.py

@@ -1,3 +1,16 @@
-import torch, monai
+"""
+Manual environment check for versions of PyTorch and MONAI.
+
+This script helps verify the runtime versions of key libraries during manual testing
+of writer error messages or environment troubleshooting.
+
+Note:
+- This is intended for manual execution only.
+- Consider moving to a diagnostics folder or integrating into automated tests.
+"""
+
+import torch
+import monai
+
 print("Torch version:", torch.__version__)
 print("MONAI version:", monai.__version__)

test_writer_error.py

@@ -1,18 +1,21 @@
 from monai.data.image_writer import resolve_writer, OptionalImportError, SUPPORTED_WRITERS, EXT_WILDCARD, ITKWriter
 
+# Fake extension to simulate unsupported file type
 ext = "fakeext"
 
 print(f"Before clearing fallback writers: {SUPPORTED_WRITERS.get(EXT_WILDCARD)}")
 
-# Temporarily clear fallback writers to simulate no support
+# Temporarily clear fallback writers to simulate no support scenario
 SUPPORTED_WRITERS[EXT_WILDCARD] = ()
 
 try:
+    # Try resolving writer for fake unsupported extension with error flag
     writers = resolve_writer(ext, error_if_not_found=True)
 except OptionalImportError as e:
+    # Catch and print the enhanced OptionalImportError with package hints
     print("Caught OptionalImportError:", e)
 finally:
-    # Restore the fallback writers to avoid side effects
+    # Restore the fallback writers to avoid side effects on other tests
     SUPPORTED_WRITERS[EXT_WILDCARD] = (ITKWriter,)
 
 print(f"After restoring fallback writers: {SUPPORTED_WRITERS.get(EXT_WILDCARD)}")