Add Edge Case and Special Scenario Tests

[AlexanderPumaPucho]

Hi there 👋,
I’m proposing to add a set of tests that cover edge cases and special scenarios to improve TinyDB’s robustness and reliability. These tests focus on situations like empty inputs, large data, special keys, nested structures, invalid configurations, and cache behavior, among others.

The goal is to ensure TinyDB handles uncommon scenarios gracefully and fails safely when necessary, without compromising data integrity. 🎯

Test Summary

Category	What’s Being Tested	Scenarios Covered
Empty or Null Inputs	Validate how the database handles empty or None values.	- Inserting empty dictionaries. - Searching for nonexistent keys. - Attempting to insert None.
Large Data Insertion	Test the database's ability to handle large documents.	- Inserting very large strings and validating proper retrieval.
Special Keys and Values	Check support for unusual key-value combinations.	- Keys with unusual characters. - None values. - Complex nested structures.
Nonexistent Keys	Verify operations with keys that don’t exist.	- Searching, updating, or deleting nonexistent keys.
Operations on Empty DB	Validate functionality when the database is empty.	- Querying, counting, updating, or deleting when no data exists.
Invalid Configurations	Handle errors with incorrect configurations.	- Using an invalid storage class.
Transform Errors	Ensure failed transformations don’t corrupt data.	- Simulating exceptions during data transformations. - Ensuring partial transformations don’t affect database integrity.
Cache Behavior	Validate cache consistency during reads and writes.	- Testing read-after-write consistency. - Multiple writes with a defined cache limit.
JSON Storage and Persistence	Validate JSON storage behavior and file size.	- Ensuring data is saved and retrieved correctly. - Verifying the file isn’t empty after saving data. - Confirming file handles are properly closed.

I hope this contribution is helpful. I’m happy to make adjustments, respond to feedback, or assist however needed 🚀.
Thanks for considering my proposal!

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