Address comment

experimental/FTheoryTools/test/tate.jl

@@ -30,9 +30,13 @@ t = global_tate_model(base; completeness_check = false)
   @test is_smooth(ambient_space(t)) == false
   @test toric_variety(calabi_yau_hypersurface(t)) == ambient_space(t)
 
+  isdefined(Main, :test_save_load_roundtrip) || include(
+    joinpath(Oscar.oscardir, "test", "Serialization", "test_save_load_roundtrip.jl")
+  )
+
   mktempdir() do path
     test_save_load_roundtrip(path, t) do loaded
-      @test tate_polynomial(loaded) == tate_polynomial(t)
+      @test tate_polynomial(t) == tate_polynomial(loaded)
       @test tate_section_a1(t) == tate_section_a1(loaded)
       @test tate_section_a2(t) == tate_section_a2(loaded)
       @test tate_section_a3(t) == tate_section_a3(loaded)

experimental/QuadFormAndIsom/test/runtests.jl

@@ -77,6 +77,10 @@ end
   Lf = integer_lattice_with_isometry(L; neg = true)
   @test order_of_isometry(Lf) == -1
 
+  isdefined(Main, :test_save_load_roundtrip) || include(
+    joinpath(Oscar.oscardir, "test", "Serialization", "test_save_load_roundtrip.jl")
+  )
+
   mktempdir() do path
     test_save_load_roundtrip(path, Lf) do loaded
       @test Lf == loaded

test/Serialization/runtests.jl

@@ -1,5 +1,8 @@
 using Oscar
 
+isdefined(Main, :test_save_load_roundtrip) ||
+  include(joinpath(Oscar.oscardir, "test", "Serialization", "test_save_load_roundtrip.jl"))
+
 include("basic_types.jl")
 include("PolyhedralGeometry.jl")
 include("containers.jl")
@@ -13,4 +16,3 @@ include("TropicalGeometry.jl")
 include("QuadForm.jl")
 include("polymake/runtests.jl")
 include("upgrades/runtests.jl")
-

test/Serialization/init_tests.jl → test/Serialization/test_save_load_roundtrip.jl

@@ -1,8 +1,7 @@
-# This file is dedicated for code that needs to be run on every worker before
-# running the tests. This is useful for test-code that is called from multiple files
-# that may run on different workers.
+# This code is needed for multiple test files that may end up on different workers.
+# Thus, this needs to be conditionally included in each of these test files.
 
-function test_save_load_roundtrip(func, path, original::T; params=nothing) where T
+function test_save_load_roundtrip(func, path, original::T; params=nothing) where {T}
   # save and load from a file
   filename = joinpath(path, "original.json")
   save(filename, original)
@@ -31,7 +30,7 @@ function test_save_load_roundtrip(func, path, original::T; params=nothing) where
   io = IOBuffer()
   save(io, original)
   seekstart(io)
-  loaded = load(io, type=T, params=params)
+  loaded = load(io; type=T, params=params)
   if T <: Vector
     @test loaded isa Vector
   else

test/runtests.jl

@@ -104,8 +104,6 @@ end
   Base.cumulative_compile_timing(true)
 end
 
-@everywhere include("Serialization/init_tests.jl")
-
 testlist = [
 
   "Aqua.jl",