Split JET tests to separate nopre test group with own Project.toml

- Create test/nopre/ directory with dedicated Project.toml for JET
- Add activate_nopre_env() function in runtests.jl
- Remove JET from main Project.toml extras/targets/compat
- Add nopre test group to CI matrix, excluded from Julia pre-release
- This matches OrdinaryDiffEq's pattern for tests that shouldn't run on pre

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: claude

.github/workflows/CI.yml

@@ -22,10 +22,14 @@ jobs:
           - DataDrivenSR
           - DataDrivenSparse
           - DataDrivenLux
+          - nopre
         version:
           - '1'
           - 'lts'
           - 'pre'
+        exclude:
+          - group: nopre
+            version: 'pre'
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2

Project.toml

@@ -30,7 +30,6 @@ CommonSolve = "0.2"
 DataInterpolations = "4, 5, 6, 7, 8"
 DiffEqBase = "6"
 DocStringExtensions = "0.7, 0.8, 0.9"
-JET = "0.9, 0.10, 0.11"
 MLUtils = "0.3, 0.4"
 ModelingToolkit = "11"
 OrdinaryDiffEqTsit5 = "1"
@@ -49,12 +48,11 @@ Symbolics = "7"
 julia = "1.10"
 
 [extras]
-JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b"
 OrdinaryDiffEqTsit5 = "b1df2697-797e-41e3-8120-5422d3b24e4a"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Test", "Random", "SafeTestsets", "Pkg", "OrdinaryDiffEqTsit5", "JET"]
+test = ["Test", "Random", "SafeTestsets", "Pkg", "OrdinaryDiffEqTsit5"]

test/nopre/Project.toml

@@ -0,0 +1,7 @@
+[deps]
+DataDrivenDiffEq = "2445eb08-9709-466a-b3fc-47e12bd697a2"
+JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[compat]
+JET = "0.9, 0.10, 0.11"

test/jet_tests.jl test/nopre/jet_tests.jltest/jet_tests.jl renamed to test/nopre/jet_tests.jl

@@ -16,6 +16,12 @@ function activate_subpkg_env(subpkg)
     return Pkg.instantiate()
 end
 
+function activate_nopre_env()
+    Pkg.activate(joinpath(@__DIR__, "nopre"))
+    Pkg.develop(PackageSpec(path = dirname(@__DIR__)))
+    return Pkg.instantiate()
+end
+
 @time begin
     if GROUP == "All" || GROUP == "Core" || GROUP == "Downstream"
         @testset "All" begin
@@ -41,13 +47,12 @@ end
                 include("./commonsolve/commonsolve.jl")
             end
         end
-
-        # Run JET analysis tests only in CI or when GROUP explicitly includes JET
-        # Note: JET tests may take longer due to static analysis overhead
-        if get(ENV, "CI", "false") == "true" || get(ENV, "RUN_JET_TESTS", "false") == "true"
-            @safetestset "JET Static Analysis" begin
-                include("./jet_tests.jl")
-            end
+    elseif GROUP == "nopre"
+        # nopre tests are excluded from Julia pre-release versions in CI
+        # to avoid failures from upstream changes (e.g., JET type inference)
+        activate_nopre_env()
+        @safetestset "JET Static Analysis" begin
+            include("nopre/jet_tests.jl")
         end
     else
         dev_subpkg(GROUP)