test: improve variable names; rm unused loc

Author: DhairyaLGandhi

test/basic_indexing.jl

@@ -282,7 +282,5 @@ y = 2 * x
 @test all(all.(y .== x))
 
 
-x = ArrayPartition(ArrayPartition(rand(3,4), rand(3,4)), rand(2))
-@test (x .* 1.2) isa ArrayPartition{<:Any, <:ArrayPartition}
-
-g = Zygote.gradient(norm, x)[1]
+x_ap = ArrayPartition(ArrayPartition(rand(3,4), rand(3,4)), rand(2))
+@test (x_ap .* 1.2) isa typeof(x_ap)