diff --git a/test/Dual.jl b/test/Dual.jl
index ab24ee4..0535dbd 100644
--- a/test/Dual.jl
+++ b/test/Dual.jl
@@ -1,12 +1,23 @@
 if isdefined(Base, :get_extension)
     import ForwardDiff
 
+    to_dual(z::Real) = ForwardDiff.Dual(z)
     to_dual(z::Complex) = Complex(ForwardDiff.Dual(real(z)), ForwardDiff.Dual(imag(z)))
 
     @testset "Dual" begin
         z = 0.5 + 0.8im
 
+        @test PolyLog.reli1(to_dual(real(z))) ≈ PolyLog.reli1(real(z)) rtol=1e-14
+        @test PolyLog.reli2(to_dual(real(z))) ≈ PolyLog.reli2(real(z)) rtol=1e-14
+        @test PolyLog.reli3(to_dual(real(z))) ≈ PolyLog.reli3(real(z)) rtol=1e-14
+        @test PolyLog.reli4(to_dual(real(z))) ≈ PolyLog.reli4(real(z)) rtol=1e-14
+
+        @test PolyLog.li0(to_dual(z)) ≈ PolyLog.li0(z) rtol=1e-14
+        @test PolyLog.li1(to_dual(z)) ≈ PolyLog.li1(z) rtol=1e-14
+        @test PolyLog.li2(to_dual(z)) ≈ PolyLog.li2(z) rtol=1e-14
+
         for n in -10:10
+            @test PolyLog.reli(n, to_dual(real(z))) ≈ PolyLog.reli(n, real(z)) rtol=1e-14
             @test PolyLog.li(n, to_dual(z)) ≈ PolyLog.li(n, z) rtol=1e-14
         end
     end