Update test_chebyshev.jl (#201)

Author: DanielVandH

test/test_chebyshev.jl

@@ -580,7 +580,7 @@ import BandedMatrices: isbanded
     end
 
     @testset "diff of truncation" begin
-        MemoryLayout(diff(ChebyshevT()[:,1:5]) * randn(5)) isa ExpansionLayout
+        @test MemoryLayout(diff(ChebyshevT()[:,1:5]) * randn(5)) isa ExpansionLayout
     end
 end
 
@@ -619,4 +619,4 @@ end
     T = Chebyshev()
     @test blockaxes(T) == (blockaxes(T,1),blockaxes(T,2)) == (Block.(Base.OneTo(1)), Block.(Base.OneTo(1)))
     @test blockaxes(T,3) == Base.OneTo(1)
-end
+end