Add test

Author: gdalle

src/dense.jl

@@ -140,7 +140,7 @@ function Base.show(io::IO, backend::AutoFiniteDiff)
         print(io, "relstep=", repr(backend.relstep; context = io), ", ")
     !isnothing(backend.absstep) &&
         print(io, "absstep=", repr(backend.absstep; context = io), ", ")
-    (isnothing(backend.dir) || !backend.dir) &&
+    backend.dir != true &&
         print(io, "dir=", repr(backend.dir; context = io))
     print(io, ")")
 end

test/runtests.jl

@@ -63,7 +63,8 @@ function every_ad_with_options()
         AutoEnzyme(mode = :forward),
         AutoFastDifferentiation(),
         AutoFiniteDiff(),
-        AutoFiniteDiff(fdtype = :fd, fdjtype = :fdj, fdhtype = :fdh),
+        AutoFiniteDiff(fdtype = :fd, fdjtype = :fdj, fdhtype = :fdh,
+            relstep = 1, absstep = 2, dir = false),
         AutoFiniteDifferences(; fdm = :fdm),
         AutoForwardDiff(),
         AutoForwardDiff(chunksize = 3, tag = :tag),