Only test if unified memory is explicitly supported

Author: christiangnrd

test/test.jl

@@ -83,8 +83,6 @@ function unittest_testsuite(Backend, backend_str, backend_mod, BackendArrayT; sk
         U = allocate(backend, Float32, 5; unified)
         if unified
             @test U[3] isa Float32
-        else
-            @test_throws ErrorException U[3]
         end
 
         x = allocate(backend, Float32, 5)