Add test for pointer.

Author: chriselrod

src/OffsetArrays.jl

@@ -294,7 +294,7 @@ end
     A
 end
 
-@inline Base.pointer(A::OffsetArray) = pointer(parent(A))
+@inline Base.unsafe_convert(::Type{Ptr{T}}, A::OffsetArray{T}) where {T} = pointer(parent(A))
 
 # For fast broadcasting: ref https://discourse.julialang.org/t/why-is-there-a-performance-hit-on-broadcasting-with-offsetarrays/32194
 Base.dataids(A::OffsetArray) = Base.dataids(parent(A))

test/runtests.jl

@@ -1390,4 +1390,10 @@ end
     @test arr == adapt(Array, s_arr)
 end
 
+@testset "Pointer" begin
+    A = rand(4, 5)
+    O = OffsetArray(@view(A[1:3,1:2:5]), -1:1, -1:1)
+    @test pointer(A) === pointer(O')
+end
+
 include("origin.jl")