remove unnecessary promote_rule for BlockedUnitRange (#299)

* remove unnecessary promote_rule

* Add promote tests

* move tests to new testset

Author: jishnub

src/blockaxis.jl

@@ -127,7 +127,6 @@ Base.convert(::Type{BlockedUnitRange{CS}}, axis::AbstractUnitRange{Int}) where C
 
 Base.unitrange(b::BlockedUnitRange) = first(b):last(b)
 
-Base.promote_rule(::Type{BlockedUnitRange{CS}}, ::Type{UnitRange{Int}}) where CS = UnitRange{Int}
 Base.promote_rule(::Type{BlockedUnitRange{CS}}, ::Type{Base.OneTo{Int}}) where CS = UnitRange{Int}
 
 """

test/test_blockindices.jl

@@ -117,6 +117,11 @@ import BlockArrays: BlockIndex, BlockIndexRange, BlockSlice
 end
 
 @testset "BlockedUnitRange" begin
+    @testset "promote" begin
+        b = blockedrange([1,2,3])
+        @test promote(b, 1:2) == (1:6, 1:2)
+        @test promote(b, Base.OneTo(2)) == (1:6, 1:2)
+    end
     @testset "Block indexing" begin
         b = blockedrange([1,2,3])
         @test axes(b) == (b,)