Added tests for new zero matrix function

Author: htsnowden

test/named_array_partition_tests.jl

@@ -9,10 +9,13 @@ using RecursiveArrayTools, Test
     @test x.a ≈ ones(10)
     @test typeof(x .+ x[1:end]) <: Vector # test broadcast precedence 
     @test all(x .== x[1:end])
+    @test ArrayInterface.zeromatrix(x) isa Matrix
+    @test size(ArrayInterface.zeromatrix(x)) == (30,30)
     y = copy(x)
     @test zero(x, (10, 20)) == zero(x) # test that ignoring dims works
     @test typeof(zero(x)) <: NamedArrayPartition
     @test (y .*= 2).a[1] ≈ 2 # test in-place bcast
+    
 
     @test length(Array(x)) == 30
     @test typeof(Array(x)) <: Array