Add more coverage

Author: mkitti

test/pipes.jl

@@ -5,12 +5,17 @@ using Interpolations
     for BC in (Throw, Flat, Line, Free, Reflect, InPlace, InPlaceQ, Periodic)
         for GT in (OnGrid, OnCell)
             @test BC(GT) == BC(GT())
+            @test BC{GT}(GT) == BC{GT}(GT())
             @test GT |> BC == BC(GT())
             for D in (Cubic, Quadratic)
                 @test GT |> BC |> D == D(BC(GT()))
                 @test GT |> BC |> D{BC{GT}} == D(BC(GT()))
+                @test D{BC}(BC) == D{BC}(BC())
             end
         end
+        @test Linear(Throw{OnGrid}) == Linear(Throw{OnGrid}())
     end
     @test BSpline() == BSpline(Linear())
+    @test_throws ArgumentError Cubic{Throw}(Flat)
+    @test_throws ArgumentError Quadratic{Throw}(Flat)
 end