diff --git a/tests/testthat/test-volsurface.R b/tests/testthat/test-volsurface.R
index 1dbfa79..c247c8e 100644
--- a/tests/testthat/test-volsurface.R
+++ b/tests/testthat/test-volsurface.R
@@ -1,26 +1,26 @@
 context("VolSurface")
 
-testthat::test_that(desc = "vol surface creation works", {
+testthat::test_that("Vol surface creation works", {
   testthat::expect_is(build_vol_surface(), "VolSurface")
 })
 
-testthat::test_that("time variance interpolation works", {
-  testthat::expect_true(is.LinearCubicTimeVarInterpolation(LinearCubicTimeVarInterpolation()))
+testthat::test_that("Time variance interpolation creation works", {
+  testthat::expect_true(
+    is.LinearCubicTimeVarInterpolation(LinearCubicTimeVarInterpolation())
+  )
 })
 
-testthat::test_that("the interpolation is working as expected", {
+testthat::test_that("Time variance interpolation works", {
   term <- c(
     as.Date("2023-08-15"), as.Date("2023-10-10"), as.Date("2020-02-29"),
     as.Date("2021-04-15"), as.Date("2022-06-10"), as.Date("2025-06-10")
   )
   smile <- c(3, 96, 150, 80, 90, 300)
-
   vs <- build_vol_surface()
-  testthat::expect_equal(
-    round(interpolate(vs, list(term = term, smile = smile)), 12)
-    , round(c(
-      0.6076543447950257, 0.26853916752886564, 0.19909034016558932,
-      0.25769535624031686, 0.25855784359768552, 0.26647898600000003
-    ), 12)
+  res <- interpolate(vs, tibble::tibble(term = term, smile = smile))
+  exp <- c(
+    0.6076543447950257, 0.26853916752886564, 0.19909034016558932,
+    0.25769535624031686, 0.25855784359768552, 0.26647898600000003
   )
+  testthat::expect_equal(round(res, 12), round(exp, 12))
 })