From a7236802906231baa326a6f69de1dfc6de77cea2 Mon Sep 17 00:00:00 2001
From: simonpcouch <simonpatrickcouch@gmail.com>
Date: Thu, 8 Sep 2022 16:20:50 -0400
Subject: [PATCH] fix formatting in `prompt_missing_implementation()`

---
 R/misc.R                                | 2 +-
 tests/testthat/_snaps/fit_interfaces.md | 7 +++++++
 tests/testthat/test_fit_interfaces.R    | 1 +
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/R/misc.R b/R/misc.R
index ae0358ce4..bceb2f9e2 100644
--- a/R/misc.R
+++ b/R/misc.R
@@ -183,7 +183,7 @@ prompt_missing_implementation <- function(cls,
   msg <- c(
     "!" = "{.pkg parsnip} could not locate an implementation for `{cls}` {mode} \\
            model specifications{if (isTRUE(user_specified_engine)) {
-           ' using the `{engine}` engine' } else {''}}."
+           paste0(' using the `', engine, '` engine')} else {''}}."
     )
 
   if (nrow(avail) == 0 && nrow(all) > 0) {
diff --git a/tests/testthat/_snaps/fit_interfaces.md b/tests/testthat/_snaps/fit_interfaces.md
index 05dc8dcc1..b3f3b70ff 100644
--- a/tests/testthat/_snaps/fit_interfaces.md
+++ b/tests/testthat/_snaps/fit_interfaces.md
@@ -12,3 +12,10 @@
     i Please install (if needed) and load to continue.
     
 
+---
+
+    ! parsnip could not locate an implementation for `cubist_rules` model specifications using the `Cubist` engine.
+    i The parsnip extension package rules implements support for this specification.
+    i Please install (if needed) and load to continue.
+    
+
diff --git a/tests/testthat/test_fit_interfaces.R b/tests/testthat/test_fit_interfaces.R
index 27075ef3b..c3d4ab4ce 100644
--- a/tests/testthat/test_fit_interfaces.R
+++ b/tests/testthat/test_fit_interfaces.R
@@ -109,4 +109,5 @@ test_that('No loaded engines', {
   )
   expect_snapshot_error({cubist_rules() %>% fit(mpg ~., data = mtcars)})
   expect_snapshot_error({poisson_reg() %>% fit(mpg ~., data = mtcars)})
+  expect_snapshot_error({cubist_rules(engine = "Cubist") %>% fit(mpg ~., data = mtcars)})
 })