add tests

Author: schillic

test/Architecture/ActivationFunction.jl

@@ -0,0 +1,5 @@
+# printing
+io = IOBuffer()
+for act in (Id(), ReLU(), Sigmoid(), Tanh(), LeakyReLU(0.1))
+    println(io, act)
+end

test/runtests.jl

@@ -7,6 +7,9 @@ import Flux, MAT, ONNX, YAML
 struct TestActivation <: ActivationFunction end
 
 @testset "Architecture" begin
+    @testset "ActivationFunction" begin
+        include("Architecture/ActivationFunction.jl")
+    end
     @testset "AbstractLayerOp" begin
         include("Architecture/AbstractLayerOp.jl")
     end