fix

Author: oscardssmith

lib/ModelingToolkitBase/test/implicit_discrete_system.jl

@@ -30,7 +30,8 @@ rng = StableRNG(22525)
     @mtkcompile sys = System([x(k) ~ x(k) * x(k - 1) - 3], t)
     if @isdefined(ModelingToolkit)
         @test_throws ModelingToolkitBase.MissingGuessError prob = ImplicitDiscreteProblem(
-            sys, [], tspan
+            sys, [], tspan,
+            missing_guess_values = MissingGuessValue.Error()
         )
     end
 end

lib/ModelingToolkitBase/test/initial_values.jl

@@ -203,7 +203,7 @@ end
 
     @test_throws ModelingToolkitBase.MissingGuessError ODEProblem(
         pend, [x => 1, g => 1], (0, 1); guesses = [y => λ, λ => y + 1],
-        missing_guess_value==MissingGuessValue.Error()
+        missing_guess_value = MissingGuessValue.Error()
     )
     ODEProblem(
         pend, [x => 1, D(y) => 0, g => 1], (0, 1);

lib/ModelingToolkitBase/test/initializationsystem.jl

@@ -627,7 +627,7 @@ if @isdefined(ModelingToolkit)
         ssys = mtkcompile(sys)
         @test_throws ModelingToolkitBase.MissingGuessError ODEProblem(
             ssys, [x => 3], (0, 1),
-            missing_guess_values = MissingGuessValue.Error()
+            missing_guess_value = MissingGuessValue.Error()
         ) # y should have a guess
     end
 end