Change bandwidths(A,k) to bandwidth(A,k) in tests (#264)

* bandwidths(A,k) to bandwidth(A,k) in tests

* fix import

Author: jishnub

test/JacobiTest.jl

@@ -10,6 +10,7 @@ using ApproxFunBase: maxspace, NoSpace, hasconversion,
 using ApproxFunBaseTest: testbandedbelowoperator, testbandedoperator, testspace, testtransforms,
                     testfunctional
 using ApproxFunOrthogonalPolynomials: jacobip
+using BandedMatrices
 using StaticArrays: SVector
 using Static
 using HalfIntegers
@@ -322,7 +323,7 @@ include("testutils.jl")
         end
         @time testbandedoperator(D)
         # only one band should be populated
-        @test bandwidths(D, 1) == -bandwidths(D, 2)
+        @test bandwidth(D, 1) == -bandwidth(D, 2)
 
         @test !isdiag(@inferred Derivative(Legendre()))
         T1 = typeof(Derivative(Legendre()))

test/miscAFBase.jl

@@ -284,7 +284,7 @@ Base.:(==)(a::UniqueInterval, b::UniqueInterval) = (@assert a.parentinterval ==
         P = PartialInverseOperator(C, (0, 6))
         Iapprox = (P * C)[1:10, 1:10]
         @test all(isone, diag(Iapprox))
-        for k in axes(Iapprox,1), j in k + 1:min(k + bandwidths(P,2), size(Iapprox, 2))
+        for k in axes(Iapprox,1), j in k + 1:min(k + bandwidth(P,2), size(Iapprox, 2))
             @test Iapprox[k,j] ≈ 0 atol=eps(eltype(Iapprox))
         end
         B = AbstractMatrix(P[1:10, 1:10])