fix SDE test

Author: vyudu

test/sdesystem.jl

@@ -875,22 +875,22 @@ let
     @parameters p d
     @brownian a
     seq = D(X) ~ p - d*X + a
-    @mtkbuild ssys1 = System([eq], t; name = :ssys)
-    @mtkbuild ssys2 = System([eq], t; name = :ssys)
+    @mtkbuild ssys1 = System([seq], t; name = :ssys)
+    @mtkbuild ssys2 = System([seq], t; name = :ssys)
     @test ssys1 == ssys2 # true
 
     continuous_events = [[X ~ 1.0] => [X ~ X + 5.0]]
     discrete_events = [5.0 => [d ~ d / 2.0]]
 
-    @mtkbuild ssys1 = System([eq], t; name = :ssys, continuous_events)
-    @mtkbuild ssys2 = System([eq], t; name = :ssys)
+    @mtkbuild ssys1 = System([seq], t; name = :ssys, continuous_events)
+    @mtkbuild ssys2 = System([seq], t; name = :ssys)
     @test ssys1 !== ssys2 
 
-    @mtkbuild ssys1 = System([eq], t; name = :ssys, discrete_events)
-    @mtkbuild ssys2 = System([eq], t; name = :ssys)
+    @mtkbuild ssys1 = System([seq], t; name = :ssys, discrete_events)
+    @mtkbuild ssys2 = System([seq], t; name = :ssys)
     @test ssys1 !== ssys2
 
-    @mtkbuild ssys1 = System([eq], t; name = :ssys, continuous_events)
-    @mtkbuild ssys2 = System([eq], t; name = :ssys, discrete_events)
+    @mtkbuild ssys1 = System([seq], t; name = :ssys, continuous_events)
+    @mtkbuild ssys2 = System([seq], t; name = :ssys, discrete_events)
     @test ssys1 !== ssys2 
 end