another typo in test

Author: longemen3000

test/runtests.jl

@@ -42,7 +42,7 @@ PolyesterForwardDiff.threaded_jacobian!(g!, y, dx, x, ForwardDiff.Chunk(8),Val{t
 X = randn(10,80);
 dXref = similar(X);
 dX = similar(X);
-ForwardDiff.gradient!(dXref, f, X, ForwardDiff.GradientConfig(f, x, ForwardDiff.Chunk(8), nothing));
+ForwardDiff.gradient!(dXref, f, X, ForwardDiff.GradientConfig(f, X, ForwardDiff.Chunk(8), nothing));
 PolyesterForwardDiff.threaded_gradient!(f, dX, X, ForwardDiff.Chunk(8));
 
 @test dX ≈ dXref