sunng87 / handlebars-rust / 29196519769

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test: add shared TestHandlebars helpers and adopt across render tests (#771)

Introduce an off-by-default `testing` cargo feature exposing a
`#[doc(hidden)] pub mod testing` with a `TestHandlebars` extension trait
over `Registry`: `assert_render_template`, `assert_render`, `register`,
`assert_render_template_ok`, `assert_render_template_err`, and
`assert_render_err`. Method names mirror the underlying `Registry` calls
1:1. The module is compiled for this crate's own tests via a self
dev-dependency, and is also available to downstream users testing custom
helpers/templates. On failure, assertions print the template and the data
so the cause is obvious without a debugger.

Adopt the trait across the render-assert tests in `tests/` and the
`src/` unit-test modules, removing ~750 lines of
`register_template_string(..).is_ok()` / `.unwrap()` / `assert_eq!`
boilerplate. `helper_macro` becomes table-driven. Low-level tests
(template AST, grammar parser, context navigation, render-of-elements,
and the detailed error-inspection tests in registry/render) are
intentionally left untouched.

Two pre-existing issues fixed during the pass:
- `helper_each::test_nested_each_with_path_ups` was missing its `#[test]`
  attribute (dead code); it now runs and passes.
- `partial::teset_partial_context_with_both_hash_and_param` typo renamed
  to `test_...`.

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