Fix deprecation warnings in tests

- Remove duplicate initial condition for PT2 test (pt2.xd already in unknowns)
- Remove bound parameter IC setting for PI/LimPI tests (gainPI.k is bound)
- Replace deprecated @mtkbuild with @mtkcompile in analog electrical tests
- Fix deprecated integer indexing on DiffEqArray in hydraulic actuator test
- Remove unused deprecated imports (get_eqs, vars, @set!) in analysis points test
- Fix linearize call to not wrap scalars in vectors

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>

Author: claude

test/Blocks/continuous.jl

@@ -90,7 +90,7 @@ end
     @named pt2 = SecondOrder(; k = k, w = w, d = d)
     @named iosys = System(connect(c.output, pt2.input), t, systems = [pt2, c])
     sys = mtkcompile(iosys)
-    prob = ODEProblem(sys, [unknowns(sys) .=> 0.0...; pt2.xd => 0.0], (0.0, 100.0))
+    prob = ODEProblem(sys, unknowns(sys) .=> 0.0, (0.0, 100.0))
     sol = solve(prob, Rodas4())
     @test sol.retcode == Success
     @test sol[pt2.output.u] ≈ pt2_func.(sol.t, k, w, d) atol = 1.0e-3
@@ -176,7 +176,6 @@ end
         systems = [pi_controller, plant, ref, fb]
     )
     sys = mtkcompile(model)
-    initial_conditions(sys)[sys.pi_controller.gainPI.k] = 1.0
     prob = ODEProblem(sys, Pair[], (0.0, 100.0))
     sol = solve(prob, Rodas4())
     @test sol.retcode == Success
@@ -277,7 +276,6 @@ end
             systems = [pi_controller, plant, ref, fb, sat]
         )
         sys = mtkcompile(model)
-        initial_conditions(sys)[sys.pi_controller.gainPI.k] = 1.0
         prob = ODEProblem(sys, Pair[], (0.0, 20.0))
         sol = solve(prob, Rodas4())
     end

test/Blocks/test_analysis_points.jl

@@ -3,7 +3,7 @@ using SciCompDSL
 using ModelingToolkit
 using ModelingToolkitStandardLibrary.Blocks
 using OrdinaryDiffEq
-using ModelingToolkit: get_eqs, vars, @set!, t_nounits as t
+using ModelingToolkit: t_nounits as t
 using ControlSystemsBase
 
 @named P = FirstOrder(k = 1, T = 1)
@@ -80,7 +80,7 @@ L = P*C
 open_sys, (u, y) = ModelingToolkit.open_loop(sys, :plant_input)
 
 # Linearizing the open-loop system should yield the same system as get_looptransfer
-matrices, _ = linearize(open_sys, [u], [y])
+matrices, _ = linearize(open_sys, u, y)
 @test matrices.A[] == -1
 @test matrices.B[] * matrices.C[] == -1 # either one negative
 @test matrices.D[] == 0

test/Electrical/analog.jl

@@ -633,7 +633,7 @@ end
         end
     end
 
-    @mtkbuild sys = SimpleNMOSCircuit(V_cc = 5.0, V_b = 3.5)
+    @mtkcompile sys = SimpleNMOSCircuit(V_cc = 5.0, V_b = 3.5)
 
     prob = ODEProblem(sys, Pair[], (0.0, 10.0))
     sol = solve(prob)
@@ -673,7 +673,7 @@ end
         end
     end
 
-    @mtkbuild flipped_sys = FlippedNMOSCircuit(V_cc = 5.0, V_b = 3.5)
+    @mtkcompile flipped_sys = FlippedNMOSCircuit(V_cc = 5.0, V_b = 3.5)
 
     flipped_prob = ODEProblem(flipped_sys, Pair[], (0.0, 10.0))
     flipped_sol = solve(flipped_prob)
@@ -717,7 +717,7 @@ end
         end
     end
 
-    @mtkbuild sys = SimplePMOSCircuit(V_s = 5.0, V_b = 2.5, V_d = 3)
+    @mtkcompile sys = SimplePMOSCircuit(V_s = 5.0, V_b = 2.5, V_d = 3)
 
     prob = ODEProblem(sys, Pair[], (0.0, 10.0))
     sol = solve(prob)
@@ -760,7 +760,7 @@ end
         end
     end
 
-    @mtkbuild flipped_sys = FlippedPMOSCircuit(V_s = 5.0, V_b = 2.5, V_d = 3)
+    @mtkcompile flipped_sys = FlippedPMOSCircuit(V_s = 5.0, V_b = 2.5, V_d = 3)
 
     flipped_prob = ODEProblem(flipped_sys, Pair[], (0.0, 10.0))
     flipped_sol = solve(flipped_prob)

test/Hydraulic/isothermal_compressible.jl

@@ -320,7 +320,7 @@ end
     defs[sys.input.buffer] = Parameter(0.5 * x, dt)
 
     # NOTE: bypassing initialization system: https://github.com/SciML/ModelingToolkit.jl/issues/3312
-    prob = ODEProblem(sys, [unknowns(initsys)[1] => initsol[1]], (0, 0.1); build_initializeprob = false)
+    prob = ODEProblem(sys, unknowns(initsys) .=> initsol.u[end], (0, 0.1); build_initializeprob = false)
 
     #TODO: Implement proper initialization system after issue is resolved
     #TODO: How to bring the body back and not have an overdetermined system?