remove unsound threading test

Author: visr

test/test_geos_types.jl

@@ -369,24 +369,6 @@ end
         return nothing
     end
     @test f91(91) === nothing
-    function f91_mixed_contexts(n)
-        nthread = Threads.nthreads()
-        contexts = [LibGEOS.GEOSContext() for i=1:nthread]
-        p = [[[-1.,-1],[+1,-1],[+1,+1],[-1,+1],[-1,-1]]]
-        Threads.@threads :static for i=1:n
-            ctx1 = contexts[rand(1:nthread)]
-            ctx2 = contexts[rand(1:nthread)]
-            ctx3 = contexts[rand(1:nthread)]
-            g1 = LibGEOS.Polygon(p, ctx1)
-            g2 = LibGEOS.Polygon(p, ctx2)
-            for j=1:n
-                @test LibGEOS.intersects(g1, g2, ctx3)
-            end
-        end
-        GC.gc(true)
-        return nothing
-    end
-    @test f91_mixed_contexts(91) === nothing
     @testset "clone" begin
         function f(n)
             # adapted from https://github.com/JuliaGeo/LibGEOS.jl/issues/91#issuecomment-1267732709