diff --git a/tests/testthat/_snaps/constructors.md b/tests/testthat/_snaps/constructors.md
index cb4da4dc..5c6bf9a1 100644
--- a/tests/testthat/_snaps/constructors.md
+++ b/tests/testthat/_snaps/constructors.md
@@ -169,6 +169,37 @@
       Range (transformed scale): [-10, -1]
       Values: 2
 
+---
+
+    Code
+      mtry_ish <- mtry()
+      mtry_ish$label <- NULL
+      print(mtry_ish)
+    Message
+      Quantitative Parameter
+      Range: [1, ?]
+
+---
+
+    Code
+      fun_ish <- weight_func()
+      fun_ish$label <- NULL
+      print(fun_ish)
+    Message
+      Qualitative Parameter
+      10 possible values include:
+      'rectangular', 'triangular', 'epanechnikov', 'biweight', 'triweight', 'cos',
+      'inv', 'gaussian', 'rank', and 'optimal'
+
+---
+
+    Code
+      signed_hash()
+    Message
+      Signed Hash Value (qualitative)
+      2 possible values include:
+      TRUE and FALSE
+
 # bad ranges
 
     Code
diff --git a/tests/testthat/_snaps/encode_unit.md b/tests/testthat/_snaps/encode_unit.md
index 6c07fa6e..8ef3c3b4 100644
--- a/tests/testthat/_snaps/encode_unit.md
+++ b/tests/testthat/_snaps/encode_unit.md
@@ -1,3 +1,27 @@
+# to [0, 1] for qualitative values
+
+    Code
+      encode_unit(prune_method(), "don't prune", direction = "forward")
+    Condition
+      Error in `encode_unit()`:
+      ! Some values are not in the reference set of possible values: "bad_vals"}.
+
+---
+
+    Code
+      encode_unit(prune_method(), 13, direction = "forward")
+    Condition
+      Error in `encode_unit()`:
+      ! `value` should be a character vector.
+
+# to [0, 1] for quantitative values
+
+    Code
+      eencode_unit(penalty(), "penalty", direction = "forward")
+    Condition
+      Error in `eencode_unit()`:
+      ! could not find function "eencode_unit"
+
 # bad args
 
     Code
@@ -95,3 +119,11 @@
       Error in `encode_unit()`:
       ! Values should be on [0, 1].
 
+---
+
+    Code
+      encode_unit(mtry(), 1:2, direction = "backward")
+    Condition
+      Error in `encode_unit()`:
+      ! The parameter object contains unknowns.
+
diff --git a/tests/testthat/_snaps/grids.md b/tests/testthat/_snaps/grids.md
index 09e3e5c4..19da2638 100644
--- a/tests/testthat/_snaps/grids.md
+++ b/tests/testthat/_snaps/grids.md
@@ -101,3 +101,11 @@
       8 0.00001          1  
       9 1                1  
 
+# new param grid from conventional data frame
+
+    Code
+      new_param_grid(as.matrix(x))
+    Condition
+      Error in `new_param_grid()`:
+      ! `x` must be a data frame to construct a new grid from.
+
diff --git a/tests/testthat/test-aaa_values.R b/tests/testthat/test-aaa_values.R
index ea50ae06..df971a6a 100644
--- a/tests/testthat/test-aaa_values.R
+++ b/tests/testthat/test-aaa_values.R
@@ -32,6 +32,8 @@ test_that("transforms", {
   expect_equal(
     value_transform(mtry(), 1:3), 1:3
   )
+  expect_false(value_validate(prior_terminal_node_coef(), 0))
+  expect_false(value_validate(activation(), "ham"))
 })
 
 
diff --git a/tests/testthat/test-constructors.R b/tests/testthat/test-constructors.R
index c330962a..d1ff8b90 100644
--- a/tests/testthat/test-constructors.R
+++ b/tests/testthat/test-constructors.R
@@ -87,6 +87,20 @@ test_that("printing", {
   expect_snapshot(
     value_set(cost_complexity(), log10(c(.09, .0001)))
   )
+
+  expect_snapshot({
+    mtry_ish <- mtry()
+    mtry_ish$label <- NULL
+    print(mtry_ish)
+  })
+
+  expect_snapshot({
+    fun_ish <- weight_func()
+    fun_ish$label <- NULL
+    print(fun_ish)
+  })
+
+  expect_snapshot(signed_hash())
 })
 
 
diff --git a/tests/testthat/test-encode_unit.R b/tests/testthat/test-encode_unit.R
index 77a4495f..1f114d2d 100644
--- a/tests/testthat/test-encode_unit.R
+++ b/tests/testthat/test-encode_unit.R
@@ -7,6 +7,14 @@ test_that("to [0, 1] for qualitative values", {
 
   z_back <- encode_unit(z, rev(z_0), direction = "backward")
   expect_equal(z_back, rev(prune_method()$values))
+  expect_snapshot(
+    error = TRUE,
+    encode_unit(prune_method(), "don't prune", direction = "forward")
+  )
+  expect_snapshot(
+    error = TRUE,
+    encode_unit(prune_method(), 13, direction = "forward")
+  )
 })
 
 
@@ -26,6 +34,10 @@ test_that("to [0, 1] for quantitative values", {
   y_trans <- encode_unit(y, y_0, direction = "backward", original = FALSE)
   expect_equal(y_orig, 214, tolerance = 0.01)
   expect_equal(y_trans, log10(214), tolerance = 0.01)
+  expect_snapshot(
+    error = TRUE,
+    eencode_unit(penalty(), "penalty", direction = "forward")
+  )
 })
 
 
@@ -98,4 +110,8 @@ test_that("bad args", {
     error = TRUE,
     encode_unit(z, 1:2, direction = "backward")
   )
+  expect_snapshot(
+    error = TRUE,
+    encode_unit(mtry(), 1:2, direction = "backward")
+  )
 })
diff --git a/tests/testthat/test-grids.R b/tests/testthat/test-grids.R
index b860b9b1..781493dd 100644
--- a/tests/testthat/test-grids.R
+++ b/tests/testthat/test-grids.R
@@ -8,6 +8,10 @@ test_that("regular grid", {
     nrow(grid_regular(mixture(), trees(), levels = 2)),
     4
   )
+  expect_equal(
+    nrow(grid_regular(mixture(), trees(), levels = 2, filter = trees == 1)),
+    2
+  )
   expect_equal(
     nrow(grid_regular(mixture(), trees(), levels = 2:3)),
     prod(2:3)
@@ -56,6 +60,10 @@ test_that("random grid", {
     nrow(grid_random(prod_degree(), prune_method(), size = 50)),
     12
   )
+  expect_equal(
+    nrow(grid_random(list(mixture(), trees()), size = 2)),
+    2
+  )
 })
 
 
@@ -92,4 +100,11 @@ test_that("new param grid from conventional data frame", {
 
   expect_no_condition(y <- dials:::new_param_grid(x))
   expect_true(tibble::is_tibble(y))
+
+  # or from a matrix?
+  expect_snapshot(
+    error = TRUE,
+    new_param_grid(as.matrix(x))
+  )
+
 })