diff --git a/config/config.exs b/config/config.exs
index 6048e84..3c32b1b 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -4,3 +4,7 @@ config :bitstyles_phoenix,
   trim_e2e_classes: [enabled: true]
 
 config :phoenix, :json_library, Jason
+
+if config_env() === :test do
+  config :bitstyles_phoenix, add_version_test_classes: true
+end
diff --git a/lib/bitstyles_phoenix/bitstyles.ex b/lib/bitstyles_phoenix/bitstyles.ex
index eae9eed..9902545 100644
--- a/lib/bitstyles_phoenix/bitstyles.ex
+++ b/lib/bitstyles_phoenix/bitstyles.ex
@@ -77,10 +77,11 @@ defmodule BitstylesPhoenix.Bitstyles do
         "u-fg-text" -> "u-fg-gray-30"
         "u-fg-text-darker" -> "u-fg-gray-50"
         "u-bg-gray-darker" -> "u-bg-gray-80"
-        "u-version-5-0-0" -> "u-version-4"
         class -> class
       end
 
+    class = test_only_downgrade(class, "u-version-5-0-0", "u-version-4")
+
     downgrade_classname(class, target_version, {4, 3, 0})
   end
 
@@ -127,10 +128,11 @@ defmodule BitstylesPhoenix.Bitstyles do
         "u-border-radius-" <> variant -> "u-round--#{variant}"
         "u-overflow-x-auto" -> "u-overflow--x"
         "u-overflow-y-auto" -> "u-overflow--y"
-        "u-version-4" -> "u-version-2"
         _ -> class
       end
 
+    class = test_only_downgrade(class, "u-version-4", "u-version-2")
+
     downgrade_classname(class, target_version, {3, 0, 0})
   end
 
@@ -147,10 +149,11 @@ defmodule BitstylesPhoenix.Bitstyles do
         "u-flex-grow-" <> number -> "u-flex__grow-#{number}"
         "u-flex-wrap" -> "u-flex--wrap"
         "u-flex-col" -> "u-flex--col"
-        "u-version-2" -> "u-version-1-4"
         _ -> class
       end
 
+    class = test_only_downgrade(class, "u-version-2", "u-version-1-4")
+
     downgrade_classname(class, target_version, {1, 5, 0})
   end
 
@@ -161,16 +164,17 @@ defmodule BitstylesPhoenix.Bitstyles do
 
   defp downgrade_classname(class, target_version, {1, 4, 0}) do
     # downgrading 1.4.0 -> 1.3.0
-    mapping =
+    class =
       case class do
         "u-grid-cols-" <> number -> "u-grid--#{number}-col"
         "u-col-span-" <> number -> "u-grid__col-span-#{number}"
         "u-col-start-" <> number -> "u-grid__col-#{number}"
-        "u-version-1-4" -> "u-version-1-3"
         _ -> class
       end
 
-    downgrade_classname(mapping, target_version, {1, 3, 0})
+    class = test_only_downgrade(class, "u-version-1-4", "u-version-1-3")
+
+    downgrade_classname(class, target_version, {1, 3, 0})
   end
 
   defp downgrade_classname(class, target_version, {1, 3, 0}) do
@@ -184,4 +188,12 @@ defmodule BitstylesPhoenix.Bitstyles do
     Please upgrade bitsyles and set the `bitsyles_version` to the updated version.
     """)
   end
+
+  defp test_only_downgrade(class, from, to) do
+    if Application.get_env(:bitstyles_phoenix, :add_version_test_classes, false) do
+      if(class == from, do: to, else: class)
+    else
+      class
+    end
+  end
 end
diff --git a/test/bitstyles_phoenix/bitstyles_test.exs b/test/bitstyles_phoenix/bitstyles_test.exs
index 4c8e935..c367223 100644
--- a/test/bitstyles_phoenix/bitstyles_test.exs
+++ b/test/bitstyles_phoenix/bitstyles_test.exs
@@ -11,8 +11,9 @@ defmodule BitstylesPhoenix.BitstylesTest do
              )
     end
 
-    # TODO: delete
-    test "chained version" do
+    test "chained version downgrade" do
+      # those class changes are only added in the test environment, to test that chaining works
+      # and won't be available to the users of bitstyles_phoenix
       assert classname("u-version-5-0-0", {5, 0, 1}) == "u-version-5-0-0"
       assert classname("u-version-5-0-0", {5, 0, 0}) == "u-version-5-0-0"
       assert classname("u-version-5-0-0", {4, 3, 0}) == "u-version-4"