fix bad tests

Author: vtjnash

test/channels.jl

@@ -390,6 +390,7 @@ end
         t = Timer(0) do t
             tc[] += 1
         end
+        Libc.systemsleep(0.005)
         @test isopen(t)
         Base.process_events()
         @test !isopen(t)
@@ -402,6 +403,7 @@ end
         t = Timer(0) do t
             tc[] += 1
         end
+        Libc.systemsleep(0.005)
         @test isopen(t)
         close(t)
         @test !isopen(t)

test/reflection.jl

@@ -507,7 +507,6 @@ f18888() = nothing
 let
     world = Core.Compiler.get_world_counter()
     m = first(methods(f18888, Tuple{}))
-    @test isempty(m.specializations)
     ft = typeof(f18888)
 
     code_typed(f18888, Tuple{}; optimize=false)