From e33af9c86fbfd806214a0e55fab2fbe1d0ea864a Mon Sep 17 00:00:00 2001
From: Joel Drapper <joel@drapper.me>
Date: Thu, 19 Dec 2024 13:08:13 +0000
Subject: [PATCH] Coerce should raise if it fails

---
 lib/literal/enum.rb | 10 ++++++++--
 test/enum.test.rb   | 12 ++++++++++--
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/lib/literal/enum.rb b/lib/literal/enum.rb
index f530c91..1c91349 100644
--- a/lib/literal/enum.rb
+++ b/lib/literal/enum.rb
@@ -153,10 +153,16 @@ def coerce(value)
 				self[value] || begin
 					const_get(value)
 				rescue NameError
-					nil
+					raise ArgumentError.new(
+						"Can't coerce #{value.inspect} into a #{inspect}."
+					)
 				end
 			else
-				self[value]
+				self[value] || raise(
+					ArgumentError.new(
+						"Can't coerce #{value.inspect} into a #{inspect}."
+					)
+				)
 			end
 		end
 
diff --git a/test/enum.test.rb b/test/enum.test.rb
index 97a9747..ba1e08d 100644
--- a/test/enum.test.rb
+++ b/test/enum.test.rb
@@ -47,8 +47,16 @@ class SymbolTypedEnum < Literal::Enum(Symbol)
 	assert_equal Color.coerce(:Red), Color::Red
 end
 
-test ".coerce with invalid symbol returns nil" do
-	assert_equal Color.coerce(:Invalid), nil
+test ".coerce with invalid symbol raises an ArgumentError" do
+	assert_raises ArgumentError do
+		Color.coerce(:Invalid)
+	end
+end
+
+test ".coerce with invalid value raises an ArgumenError" do
+	assert_raises ArgumentError do
+		Color.coerce("invalid value")
+	end
 end
 
 test ".[] looks up the key by value" do