Test for BlockRange with size (#274)

Author: jishnub

test/test_blockindices.jl

@@ -163,6 +163,11 @@ end
 
         b = BlockRange(OffsetArrays.IdOffsetRange.((2:4, 3:5), 2))
         @test b[axes(b)...] === b
+
+        b = BlockRange(3)
+        for i in 1:3
+            @test b[i] == Block(i)
+        end
     end
 
     @testset "firsts/lasts/lengths" begin