test: update tests to use ImperativeAffect

Author: AayushSabharwal

test/symbolic_events.jl

@@ -1067,8 +1067,7 @@ end
 @testset "Initialization" begin
     @variables x(t)
     seen = false
-    f = ModelingToolkit.FunctionalAffect(
-        f = (i, u, p, c) -> seen = true, sts = [], pars = [], discretes = [])
+    f = ModelingToolkit.ImperativeAffect(f = (o, m, ctx, int) -> seen = true)
     cb1 = ModelingToolkit.SymbolicContinuousCallback(
         [x ~ 0], nothing, initialize = [x ~ 1.5], finalize = f)
     @mtkbuild sys = System(D(x) ~ -1, t, [x], []; continuous_events = [cb1])
@@ -1080,16 +1079,13 @@ end
 
     @variables x(t)
     seen = false
-    f = ModelingToolkit.FunctionalAffect(
-        f = (i, u, p, c) -> seen = true, sts = [], pars = [], discretes = [])
+    f = ModelingToolkit.ImperativeAffect(f = (o, m, ctx, int) -> seen = true)
     cb1 = ModelingToolkit.SymbolicContinuousCallback(
         [x ~ 0], nothing, initialize = [x ~ 1.5], finalize = f)
     inited = false
     finaled = false
-    a = ModelingToolkit.FunctionalAffect(
-        f = (i, u, p, c) -> inited = true, sts = [], pars = [], discretes = [])
-    b = ModelingToolkit.FunctionalAffect(
-        f = (i, u, p, c) -> finaled = true, sts = [], pars = [], discretes = [])
+    a = ModelingToolkit.ImperativeAffect(f = (o, m, ctx, int) -> inited = true)
+    b = ModelingToolkit.ImperativeAffect(f = (o, m, ctx, int) -> finaled = true)
     cb2 = ModelingToolkit.SymbolicContinuousCallback(
         [x ~ 0.1], nothing, initialize = a, finalize = b)
     @mtkbuild sys = System(D(x) ~ -1, t, [x], []; continuous_events = [cb1, cb2])