Reomove lookuptable from transferfunction test

#470

tests/src/test_transfer_function.cpp

@@ -88,19 +88,6 @@ SCENARIO("Creating, saving and loading a transfer function",
         REQUIRE(transfer_function.Interpolate(0.5f) == black_color);
       }
     }
-
-    WHEN("We ask for a nearest neighbor interpolated Lookup table") {
-      transfer_function.SetMode(
-          phx::TransferFunction::InterpolationMode::NEAREST_NEIGHBOR);
-      auto lut = transfer_function.GetLookupTable(11);
-      THEN("The Lookuptable is generated correctly") {
-        REQUIRE(lut.at(0).r == Approx(1.0));
-        REQUIRE(lut.at(2).r == Approx(1.0));
-        REQUIRE(lut.at(5).r == Approx(0.0));
-        REQUIRE(lut.at(7).r == Approx(0.0));
-        REQUIRE(lut.at(10).r == Approx(0.0));
-      }
-    }
   }
 
   GIVEN("A test transfer function with only one value") {