fix tests

stdlib/Profile/src/Profile.jl

@@ -95,6 +95,10 @@ using keywords or in the order `(n, delay)`.
 """
 function init(; n::Union{Nothing,Integer} = nothing, delay::Union{Nothing,Real} = nothing, limitwarn::Bool = true)
     n_cur = ccall(:jl_profile_maxlen_data, Csize_t, ())
+    if n_cur == 0 && isnothing(n) && isnothing(delay)
+        # indicates that the buffer hasn't been initialized at all, so set the default
+        return default_init()
+    end
     delay_cur = ccall(:jl_profile_delay_nsec, UInt64, ())/10^9
     if n === nothing && delay === nothing
         nthreads = Sys.iswindows() ? 1 : Threads.nthreads() # windows only profiles the main thread