Runtime: Streamline the transform library's input validation

This code was copy/pasted from the previous iteration of the runtime, which didn't include a validation library.

Runtime/Libraries/transform.lua

@@ -1,3 +1,6 @@
+local validation = require("validation")
+local validateString = validation.validateString
+
 local transform = {
 	ENABLE_TEXT_TRANSFORMATIONS = true,
 	START_SEQUENCE = "\27[",
@@ -68,9 +71,8 @@ function transform.strip(coloredConsoleText)
 end
 
 local function transformText(text, color)
-	if type(text) ~= "string" then
-		error("Usage: transform." .. color .. "(text : string)", 0)
-	end
+	validateString(text, "text")
+	validateString(color, "color")
 
 	if not transform.ENABLE_TEXT_TRANSFORMATIONS then
 		return text

Tests/BDD/transform-library.spec.lua

@@ -77,9 +77,13 @@ describe("transform", function()
 		}
 		for _, color in ipairs(supportedTerminalColors) do
 			for _, invalidValue in ipairs(invalidValues) do
+				local actualType = type(invalidValue)
 				assertThrows(function()
 					transform[color](invalidValue)
-				end, "Usage: transform." .. color .. "(text : string)")
+				end, format(
+					"Expected argument text to be a string value, but received a %s value instead",
+					actualType
+				))
 			end
 		end
 	end)