Test for ultiplication inference (#307)

Author: jishnub

Project.toml

@@ -30,7 +30,7 @@ ApproxFunOrthogonalPolynomialsPolynomialsExt = "Polynomials"
 ApproxFunOrthogonalPolynomialsStaticExt = "Static"
 
 [compat]
-ApproxFunBase = "0.8.55, 0.9.11"
+ApproxFunBase = "0.8.57, 0.9.13"
 ApproxFunBaseTest = "0.1"
 Aqua = "0.7"
 BandedMatrices = "0.16, 0.17"

test/ChebyshevTest.jl

@@ -8,7 +8,7 @@ using Test
 using ApproxFunBase: transform!, itransform!
 using ApproxFunBaseTest: testspace
 using ApproxFunOrthogonalPolynomials: forwardrecurrence
-import Polynomials 
+import Polynomials
 
 include("testutils.jl")
 

test/OperatorTest.jl

@@ -111,6 +111,11 @@ include("testutils.jl")
         @time testbandedoperator(A)
 
         @test norm((mul_coefficients(A,f.coefficients))-coefficients(x.*f,rangespace(A))) < 100eps()
+
+        M = Multiplication(Fun(),Chebyshev());
+        @test @inferred(M * M * M) * Fun() ≈ Fun(x->x^4, Chebyshev())
+        M1 = Multiplication(Fun());
+        @test @inferred(M1 * (M * M)) * Fun() ≈ Fun(x->x^4, Chebyshev())
     end
 
     @testset "Integral" begin