add test

Author: TorkelE

test/symbolic_events.jl

@@ -1440,3 +1440,11 @@ end
     @mtkcompile sys = MWE()
     @test_nowarn ODEProblem(sys, [], (0.0, 1.0))
 end
+
+@testset "Test erroneously created events yields errors" begin
+    @parameters p(t) d
+    @variables X(t)
+    @test_throws "Vectors of symbolic conditions are not allowed" SymbolicDiscreteCallback([X < 5.0] => [X ~ Pre(X) + 10.0])
+    @test_throws "Vectors of symbolic conditions are not allowed" SymbolicDiscreteCallback([X < 5.0, X > 10.0] => [X ~ Pre(X) + 10.0])
+    @test_throws "MethodError: no method" SymbolicContinuousCallback((X < 5.0) => [X ~ Pre(X) + 10.0])
+end