added unit tests for data transformer types

[Nityam573]

Closes #2575

Introduced changes

Added u384 tests

Checklist

• ✅ Linked relevant issue
• Updated relevant documentation
• ✅ Added relevant tests
• ✅ Performed self-review of the code
• ✅ Added changes to CHANGELOG.md

[franciszekjob]

Hi @Nityam573 👋,
let me if you're ready for review or need any assistance 😄

[franciszekjob]

Hi @Nityam573 😄,
I see you've added test for u384, are you going to add tests for other types?

Also, please fix formatting and lint, by running cargo fmt and cargo lint as described in the development docs

[Nityam573]

@franciszekjob i am on it will ready for review by tonight

[Nityam573]

@franciszekjob please review

[franciszekjob]

CairoU384 isn't used anywhere in this test, please fix that 🙏

[franciszekjob]

Suggested change

	#[test]
	fn test_invalid_hex() {
	let result = CairoBytes31::from_str("invalid_hex");
	assert!(matches!(result, Err(ParseBytes31Error::CairoFromStrError)));
	}
	#[test]
	fn test_empty_string() {
	let result = CairoBytes31::from_str("");
	assert!(matches!(result, Err(ParseBytes31Error::CairoFromStrError)));
	}
	#[test_case("wrong_string_value"; "wrong string value")]
	#[test_case(""; "empty string")]
	fn test_invalid_string(input: &str) {
	let result = CairoBytes31::from_str(input);
	assert!(matches!(result, Err(ParseBytes31Error::CairoFromStrError)));
	}

Also, we need to add test-case under [dev-dependencies] in Cargo.toml.