Fix partitions(0), closes #143

Author: FedericoStra

src/partitions.jl

@@ -17,7 +17,11 @@ end
 Base.length(p::IntegerPartitions) = npartitions(p.n)
 Base.eltype(p::IntegerPartitions) = Vector{Int}
 
-function Base.iterate(p::IntegerPartitions, xs = Int[])
+function Base.iterate(p::IntegerPartitions, xs = nothing)
+    if xs === nothing
+        p.n == 0 && return Int[], Int[]
+        xs = Int[]
+    end
     length(xs) == p.n && return
     xs = nextpartition(p.n,xs)
     (xs, xs)

test/partitions.jl

@@ -1,7 +1,7 @@
 @testset "partitions" begin
 
     @testset "partitions(n::Integer)" begin
-        @test_broken collect(partitions(0)) == [[]]
+        @test collect(partitions(0)) == [[]]
         @test collect(partitions(1)) == [[1]]
         @test collect(partitions(2)) == [[2], [1, 1]]
         @test collect(partitions(3)) == [[3], [2, 1], [1, 1, 1]]