Adds a bunch of additional sample config toml files. Via the
`datatest_runner`, these each correspond to a test case to check that
the toml is correctly (in-)validated according to the schema.
The `valid/*.toml` files typically define multiple related config
options at once. Where there's some overlap with the default configs in
`cli/src/config`, the aim was to choose different allowed values, e.g.
hex colors, file size in bytes (numeric), etc.
The `invalid/*.toml` files typically only define a single offending
property such as to not obscure individual false negatives. All of the
"invalid" files are still valid toml as the aim is not to test the
`toml_edit` crate or Taplo.
The sample files all contain a Taplo schema directive. This allows them
to be validated against the schema on the fly by Taplo's LSP and derived
IDE plugins to speed up editing and immediately highlight offending
options.
Closes#5695.
The `datatest-stable` crate allows to dynamically instantiate test cases
based on available files. This is applied to `test_config_schema` to
create one test case per config file. As case in point, the test case
for `hints.toml` was missing previously, hence the total number of tests
is up one.
This will become useful when adding more config examples to somewhat
exhaust the schema.
`datatest-stable` uses a custom test harness and thus cannot be used in
the same integration test binary that all of the other test modules run
in. However, if data-driven tests are to be used for other applications,
they can share in the same binary, so the module structure is already
set up to mirror the central "runner" approach.
