diff --git a/test/testsuite.jl b/test/testsuite.jl
index e4aea4f7..b5c58f52 100644
--- a/test/testsuite.jl
+++ b/test/testsuite.jl
@@ -17,6 +17,9 @@ using Test
 using Adapt
 
 test_result(@nospecialize(a), @nospecialize(b); kwargs...) = a == b
+test_result(::Nothing, ::Nothing; kwargs...) = true
+test_result(::Nothing, @nospecialize(b); kwargs...) = false
+test_result(@nospecialize(a), ::Nothing; kwargs...) = false
 test_result(a::Number, b::Number; kwargs...) = ≈(a, b; kwargs...)
 test_result(a::Missing, b::Missing; kwargs...) = true
 test_result(a::Number, b::Missing; kwargs...) = false
diff --git a/test/testsuite/indexing.jl b/test/testsuite/indexing.jl
index 9558a998..005b24f0 100644
--- a/test/testsuite/indexing.jl
+++ b/test/testsuite/indexing.jl
@@ -159,6 +159,7 @@ end
         # 1D
         @test compare(findfirst, AT, rand(Bool, 100))
         @test compare(x->findfirst(>(0.5f0), x), AT, rand(Float32, 100))
+        @test compare(findfirst, AT, fill(false, 10))
         let x = fill(false, 10)
             @test findfirst(x) == findfirst(AT(x))
         end