Use SciMLTesting v1.0.0 (run_tests harness)

[ChrisRackauckas-Claude]

Replaces the hand-written GROUP-dispatch in test/runtests.jl with a single SciMLTesting.run_tests(...) call (SciMLTesting v1.0.0).

Shape

Single-package, GROUP-dispatched, QA in an isolated test/qa sub-env, default GROUP="Core".

Mapping (behavior-equivalent)

• core = thunk reproducing the original Core||All body verbatim: include("interface_tests.jl"), include("jet_tests.jl"), and the inline @ode_def_bare/solve MATLAB-runtime checks. A thunk (not a file include) is required because that body runs in the runtests.jl scope where using DiffEqBase, MATLABDiffEq, ParameterizedFunctions is in effect.
• QA = groups["QA"] with a declared env = test/qa. A declared-env group is not run under "All" and is selectable only via GROUP="QA", exactly matching the original (if GROUP == "QA"). activate_group_env reproduces the old activate_qa_env (activate test/qa + Pkg.develop the repo root + instantiate). QA body kept verbatim (custom JET.report_package + report-count assertion), not collapsed into run_qa.
• default = "Core" preserves the original get(ENV, "GROUP", "Core").

Routing verified for every CI-relevant GROUP: unset→core, All→core, Core→core, QA→qa.

Project.toml

• [extras]/[targets].test/[compat]: add SciMLTesting (UUID 09d9d899-...), drop Pkg (only the old harness used it; Pkg. appears in no other test file; SciMLTesting bundles Pkg).

Ignore until reviewed by @ChrisRackauckas.

🤖 Generated with Claude Code

[ChrisRackauckas-Claude]

Closing: this run_tests v1.0.0 conversion is NOT behavior-equivalent. This repo runs QA only for GROUP=="QA" and excludes it from "All" (the default local ]test). In released SciMLTesting v1.0.0 the only encodings are (a) the qa= kwarg, which also runs QA under "All" (changes behavior), or (b) a groups["QA"] entry, which is unreachable for GROUP=="QA": run_tests' elseif group=="QA" branch short-circuits and throws no qa body was provided before reaching the groups table (src lines 499-501, before 504). Empirically reproduced (GROUP="QA" throws). Blocked on SciML/SciMLTesting.jl#5; re-attempt after that lands + a new release.