From c22c92e9ba4c5d3cec4df5c28996fb2af409b5a2 Mon Sep 17 00:00:00 2001
From: Felix Benning <felix.benning@gmail.com>
Date: Mon, 5 Jun 2023 17:23:04 +0200
Subject: [PATCH] push broken state (upstream issue)

https://github.com/JuliaGaussianProcesses/KernelFunctions.jl/issues/517
---
 test/diffKernel.jl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/test/diffKernel.jl b/test/diffKernel.jl
index 647c25f..32e642d 100644
--- a/test/diffKernel.jl
+++ b/test/diffKernel.jl
@@ -15,8 +15,11 @@
     ]
         k = EnableDiff(k1)
         for x in [0, 1, -1, 42]
-            # correlation with self should be positive
-            @test k((x, partial(1)), (x, partial(1))) > 0 skip = true
+            # correlation with self should be positive 
+            ## This fails for Matern and RationalQuadraticKernel
+            # because its implementation branches on x == y resulting in a zero derivative
+            # (cf. https://github.com/JuliaGaussianProcesses/KernelFunctions.jl/issues/517)
+            @test k((x, partial(1)), (x, partial(1))) > 0
 
             # the slope should be positively correlated with a point further down
             @test k(