Add test

Author: N5N3

test/reducedim.jl

@@ -544,3 +544,11 @@ end
 @testset "type stability (issue #43461)" begin
     @test (@inferred maximum(Float64, reshape(1:4,2,:); dims = 2)) == reshape([3,4],2,1)
 end
+
+@testset "Min/Max initialization test" begin
+    A = Vector{Union{Missing,Int}}(1:4)
+    A[2] = missing
+    @test @inferred(minimum(exp, A; dims = 1))[1] === missing
+    @test @inferred(maximum(exp, A; dims = 1))[1] === missing
+    @test @inferred(extrema(exp, A; dims = 1))[1] === (missing, missing)
+end