Compat: cumsum doesn't support iterators, @inferred and .≈

Julia 1.0's cumsum doesn't work for iterators -> Collect first

@inferred didn't support Allowed types until v1.2
- Added in JuliaLang/julia#27516
- Add VERSION check and only run type stability checks if >= v1.2

.≈ does seem to be defined in v1.0 (Weird)
- Use separate Eq Checks if 1D or 2D (Don't need to map at all if 1D)
- Replace broadcasting with map -> Seems to work

test/iterate.jl

@@ -25,6 +25,9 @@ macro test_knots(itersym, type, expect...)
 
  # Expect HasShape{N} for ND Iterators
  IteratorSizeExpr = :( Base.HasShape{$(length(expect))}() )
+
+ # Content Check for 1D array of tuples
+ IterEqCheck = :( all(map( (x,y) -> (all∘map)(≈, x, y), kiter, kref )))
  else
  refExpr = expect[1]
  knotTypeExpr = :( eltype($refExpr) )
@@ -36,6 +39,28 @@ macro test_knots(itersym, type, expect...)
 
  # Expect a IteratorSize of HasLength for 1D iterators
  IteratorSizeExpr = :( Base.HasLength() )
+
+ # Content Check for 1D arrays
+ IterEqCheck = :( kiter ≈ kref )
+ end
+
+ # Check Type-stability if v > 1.2
+ @static if VERSION >= v"1.2"
+ # Check Type-stability using inferred
+ type_stability_checks = quote
+ @testset "type stability" begin
+ iteratetype = Union{Nothing, knotType}
+ y = @inferred iteratetype iterate($itersym)
+ if y !== nothing
+ @test_nowarn @inferred iteratetype iterate($itersym, y[2])
+ end
+ isBounded && @test_nowarn @inferred Integer length($itersym)
+ @test_nowarn @inferred Type eltype($itersym)
+ end
+ end
+ else
+ # Skip Type-stability checks as @inferred AllowedTypes is Undefined
+ type_stability_checks = :()
  end
 
  # Build test_knots tests
@@ -90,19 +115,11 @@ macro test_knots(itersym, type, expect...)
  @test eltype(kiter) == eltype(kref)
  @test length(kiter) == length(kref)
  @test size(kiter) == size(kref)
- @test map((x,y) -> all(x .≈ y), kiter, kref) |> all
+ @test $IterEqCheck
  end
 
  # Type stability -> Check that methods are type suitable
- @testset "type stability" begin
- iteratetype = Union{Nothing, knotType}
- y = @inferred iteratetype iterate($itersym)
- if y !== nothing
- @test_nowarn @inferred iteratetype iterate($itersym, y[2])
- end
- isBounded && @test_nowarn @inferred Integer length($itersym)
- @test_nowarn @inferred Type eltype($itersym)
- end
+ $type_stability_checks
  end
 end
 
@@ -148,7 +165,7 @@ function knot_ref(seq, ::Periodic)
  # Generate 200 samples (2x factor on testing done by @test_knots)
  # Then wrap with cycle to get IteratorSize === IsInfinite
  # TODO: Remove when Julia v1 is no longer supported
- ref = Iterators.take(iter, 200) |> cumsum |> Iterators.cycle
+ ref = Iterators.take(iter, 200) |> collect |> cumsum |> Iterators.cycle
  end
 end
 
@@ -162,7 +179,7 @@ function knot_ref(seq, ::Reflect)
  # Generate 200 samples (2x factor on testing done by @test_knots)
  # Then wrap with cycle to get IteratorSize === IsInfinite
  # TODO: Remove when Julia v1 is no longer supported
- ref = Iterators.take(iter, 200) |> cumsum |> Iterators.cycle
+ ref = Iterators.take(iter, 200) |> collect |> cumsum |> Iterators.cycle
  end
 end