more tests

Author: isaacsas

test/problem_building_test.jl

@@ -86,4 +86,15 @@ let
 
     dprob3 = DiscreteProblem(u₀, [0.0, 1.0], p)
     @test dprob.tspan === (0.0, 1.0)
+
+    dprob4 = DiscreteProblem{true}(nothing, nothing, p)
+    dprob4b = DiscreteProblem{true}(nothing, nothing)
+    dprob5 = DiscreteProblem{true}(SciMLBase.DISCRETE_INPLACE_DEFAULT, u₀, tspan, p)
+    dprob6 = DiscreteProblem{true}(SciMLBase.DISCRETE_INPLACE_DEFAULT, u₀, tspan)
+    dprob7 = DiscreteProblem{true}((du,u,p,t) -> du[1] = 0, u₀, tspan)
+    @test dprob7.u0 === u₀
+    @test dprob7.tspan === tspan
+    dprob8 = DiscreteProblem{true}(nothing, u₀, tspan)
+    @test dprob8.u0 === u₀
+    @test dprob8.tspan === tspan
 end