use gamma instead of factorial in tests (#45)

Author: jishnub

Project.toml

@@ -22,7 +22,7 @@ FastTransforms = "0.10, 0.11, 0.12, 0.13, 0.14"
 InfiniteArrays = "0.5, 0.6, 0.7, 0.8, 0.9, 0.10, 0.11, 0.12"
 IntervalSets = "0.5, 0.6, 0.7"
 Reexport = "0.2, 1"
-SpecialFunctions = "0.8, 0.9, 0.10, 1.0"
+SpecialFunctions = "0.8, 0.9, 0.10, 1.0, 2.0"
 julia = "1.3"
 
 [extras]

test/runtests.jl

@@ -5,7 +5,7 @@ import ApproxFunBase: testspace, testtransforms, testmultiplication, testraggedb
                     testcalculus, Block, Vec, testfunctional, EmptyDomain, UnionDomain
 using LinearAlgebra
 using SpecialFunctions
-import SpecialFunctions: factorial
+_factorial(n) = gamma(n+1)
 using Test
 
 @testset "Periodic Domains" begin
@@ -262,7 +262,7 @@ end
     z=Fun(identity,Circle())
     cfs=exp(z).coefficients[1:2:end]
     for k=1:length(cfs)
-        @test abs(cfs[k]-1/factorial(1.0(k-1))) ≤ 1E-10
+        @test abs(cfs[k]-1/_factorial(k-1)) ≤ 1E-10
     end
 
     ## Test bug in multiplication