Test for inf norm (#300)

* test for inf norm

* Test for norm

Author: jishnub

Project.toml

@@ -27,7 +27,7 @@ Static = "aedffcd0-7271-4cad-89d0-dc628f76c6d3"
 ApproxFunOrthogonalPolynomialsStaticExt = "Static"
 
 [compat]
-ApproxFunBase = "0.8.53, 0.9.8"
+ApproxFunBase = "0.8.55, 0.9.11"
 ApproxFunBaseTest = "0.1"
 Aqua = "0.6"
 BandedMatrices = "0.16, 0.17"

test/ChebyshevTest.jl

@@ -220,6 +220,10 @@ include("testutils.jl")
         x=Fun()
         @test minimum(x) == -1
         @test maximum(x) == 1
+
+        a = abs(x)
+        @test maximum(abs, x - a) == maximum(abs, a - x) == 2
+        @test norm(x - a, Inf) == norm(a - x, Inf) == 2
     end
 
     @testset "Do not overresolve #7" begin