fix tests for JuliaDiff/ChainRulesCore.jl#298 (#370)

* fix tests for JuliaDiff/ChainRulesCore.jl#298

* Apply suggestions from code review

Co-authored-by: Lyndon White <[email protected]>

Co-authored-by: Lyndon White <[email protected]>

Author: simeonschaub

Project.toml

@@ -12,7 +12,7 @@ Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
-ChainRulesCore = "0.9.26"
+ChainRulesCore = "0.9.29"
 ChainRulesTestUtils = "0.6.1"
 Compat = "3"
 FiniteDifferences = "0.11, 0.12"

test/rulesets/Random/random.jl

@@ -46,7 +46,7 @@ Random.rand(d::NormalDistribution) = d.μ + d.σ*randn()
             x, pb = rrule(rand, args...)
             @test x isa xType
             dself, dargs = Iterators.peel(pb(10.0))
-            @test dself isa Zero
+            @test iszero(dself)
             @test all(darg isa DoesNotExist for darg in dargs)
         end