fix(tests): handle both old and new Rosenbrock cache fields in resize_tests

Julia 1.10 does not support [sources] in Project.toml, so the umbrella
package resolves OrdinaryDiffEqRosenbrock from the registry (old
Rosenbrock23Cache). Use hasfield to handle both cache types.

Author: Harsh Singh

test/integrators/resize_tests.jl

@@ -76,10 +76,20 @@ i = init(prob, Rosenbrock23())
 resize!(i, 5)
 @test length(i.cache.u) == 5
 @test length(i.cache.uprev) == 5
-@test all(length.(i.cache.ks) .== 5)
+if hasfield(typeof(i.cache), :ks)
+    @test all(length.(i.cache.ks) .== 5)
+else
+    @test length(i.cache.k₁) == 5
+    @test length(i.cache.k₂) == 5
+    @test length(i.cache.k₃) == 5
+end
 @test length(i.cache.du1) == 5
 @test length(i.cache.du2) == 5
-@test all(length.(i.cache.dense) .== 5)
+if hasfield(typeof(i.cache), :dense)
+    @test all(length.(i.cache.dense) .== 5)
+else
+    @test length(i.cache.f₁) == 5
+end
 @test length(i.cache.fsalfirst) == 5
 @test length(i.cache.fsallast) == 5
 @test length(i.cache.dT) == 5
@@ -102,10 +112,20 @@ i = init(prob, Rosenbrock23(autodiff = AutoForwardDiff(), linsolve = KrylovJL_GM
 resize!(i, 5)
 @test length(i.cache.u) == 5
 @test length(i.cache.uprev) == 5
-@test all(length.(i.cache.ks) .== 5)
+if hasfield(typeof(i.cache), :ks)
+    @test all(length.(i.cache.ks) .== 5)
+else
+    @test length(i.cache.k₁) == 5
+    @test length(i.cache.k₂) == 5
+    @test length(i.cache.k₃) == 5
+end
 @test length(i.cache.du1) == 5
 @test length(i.cache.du2) == 5
-@test all(length.(i.cache.dense) .== 5)
+if hasfield(typeof(i.cache), :dense)
+    @test all(length.(i.cache.dense) .== 5)
+else
+    @test length(i.cache.f₁) == 5
+end
 @test length(i.cache.fsalfirst) == 5
 @test length(i.cache.fsallast) == 5
 @test length(i.cache.dT) == 5
@@ -119,10 +139,20 @@ i = init(prob, Rosenbrock23(; autodiff = AutoFiniteDiff()))
 resize!(i, 5)
 @test length(i.cache.u) == 5
 @test length(i.cache.uprev) == 5
-@test all(length.(i.cache.ks) .== 5)
+if hasfield(typeof(i.cache), :ks)
+    @test all(length.(i.cache.ks) .== 5)
+else
+    @test length(i.cache.k₁) == 5
+    @test length(i.cache.k₂) == 5
+    @test length(i.cache.k₃) == 5
+end
 @test length(i.cache.du1) == 5
 @test length(i.cache.du2) == 5
-@test all(length.(i.cache.dense) .== 5)
+if hasfield(typeof(i.cache), :dense)
+    @test all(length.(i.cache.dense) .== 5)
+else
+    @test length(i.cache.f₁) == 5
+end
 @test length(i.cache.fsalfirst) == 5
 @test length(i.cache.fsallast) == 5
 @test length(i.cache.dT) == 5