Update ChebyshevTest.jl

Author: putianyi889

test/ChebyshevTest.jl

@@ -202,4 +202,10 @@ using ApproxFunOrthogonalPolynomials, ApproxFunBase, LinearAlgebra, Test
         f = 1/(1 + 25*(x^2))
         @test norm(f, Inf) ≈ 1.0
     end
+    
+    @testset "Jacobi" begin
+        S=Chebyshev()
+        @test S.a==-0.5
+        @test S.b==-0.5
+    end
 end