ProductFun coefficient tests (#292)

Author: jishnub

Project.toml

@@ -27,7 +27,7 @@ Static = "aedffcd0-7271-4cad-89d0-dc628f76c6d3"
 ApproxFunOrthogonalPolynomialsStaticExt = "Static"
 
 [compat]
-ApproxFunBase = "0.8.48, 0.9.3"
+ApproxFunBase = "0.8.49, 0.9.4"
 ApproxFunBaseTest = "0.1"
 Aqua = "0.6"
 BandedMatrices = "0.16, 0.17"

test/MultivariateTest.jl

@@ -531,6 +531,12 @@ include("testutils.jl")
             b = ((P * KroneckerOperator(A)) * P)(xi, yi)
             @test a ≈ b
         end
+
+        @testset "coefficients" begin
+            local P = ProductFun((x,y) -> x*y, Chebyshev()^2)
+            @test coefficients(P, space(P)) == coefficients(P)
+            @test Fun(ProductFun(P, Ultraspherical(1)^2)) ≈ Fun(P)
+        end
     end
 
     @testset "Functional*Fun" begin