test: Move element test to unified folder

[cathay4t]

No description provided.

[gemini-code-assist]

Code Review

This pull request moves the element tests from src/element.rs to a unified src/tests/ directory. However, this change introduces compilation errors because the new test module is not declared in src/tests/mod.rs and the imports in the moved test file still use super instead of referencing the correct crate paths.

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src/element.rs (12-13)

Moving the element tests to the unified src/tests/ directory introduces two issues that will prevent the tests from compiling and running:

1. Missing Module Declaration: The new test file src/tests/element.rs is not declared in src/tests/mod.rs. You need to add mod element; to src/tests/mod.rs so that the tests are compiled and executed.
2. Broken Imports: In src/tests/element.rs, the imports use use super::{...}. Previously, super referred to crate::element where these types are defined. Now that the file is under crate::tests, super refers to crate::tests, which does not contain these types. You should update the imports in src/tests/element.rs to use use crate::{...} instead.