fix type inference of chebyshev points

Author: dlfivefifty

src/chebyshevtransform.jl

@@ -119,7 +119,7 @@ end
 
 
 # Matrix inputs
-# 
+#
 #
 # function chebyshevtransform!(X::AbstractMatrix{T}; kind::Integer=1) where T<:fftwNumber
 #     if kind == 1
@@ -296,6 +296,8 @@ function chebyshevpoints(::Type{T}, n::Integer; kind::Int=1) where T<:Number
         else
             T[cospi(k/(n-one(T))) for k=0:n-1]
         end
+    else
+        throw(ArgumentError("kind $kind not a valid kind of Chebyshev points"))
     end
 end
 chebyshevpoints(n::Integer; kind::Int=1) = chebyshevpoints(Float64, n; kind=kind)

test/chebyshevtests.jl

@@ -6,11 +6,12 @@ using FastTransforms, Compat, Compat.Test
         @test chebyshevpoints(10; kind=2) == chebyshevpoints(Float64, 10; kind=2)
         for T in (Float32, Float64, ComplexF32, ComplexF64)
             @test chebyshevpoints(T, 0, kind=1) == chebyshevpoints(T, 0, kind=2) == T[]
-            @test chebyshevpoints(T, 1, kind=1) == chebyshevpoints(T, 1, kind=2) == T[]
+            @test chebyshevpoints(T, 1, kind=1) == chebyshevpoints(T, 1, kind=2) == T[0]
 
             n = 20
             @inferred(chebyshevpoints(T, n, kind=1))
-            @inferred(chebyshevpoints(T, n, kind=1))
+            @inferred(chebyshevpoints(T, n, kind=2))
+            @test_throws ArgumentError chebyshevpoints(n, kind=-1)
         end
     end