Raise missing asset error in more places

lib/propshaft/compilers/css_asset_urls.rb

@@ -29,7 +29,7 @@ def asset_url(resolved_path)
       if asset = assembly.load_path.find(resolved_path)
         %[url("#{assembly.config.prefix}/#{asset.digested_path}")]
       else
-        raise Propshaft::MissingAssetError, "The asset '#{resolved_path}' was not found in the load path."
+        raise Propshaft::MissingAssetError.new(resolved_path)
       end
     end
 end

lib/propshaft/errors.rb

@@ -5,5 +5,14 @@ module Propshaft
   class Error < StandardError; end
 
   # Raised when LoadPath cannot find the requested asset
-  class MissingAssetError < Error; end
+  class MissingAssetError < Error
+    def initialize(path)
+      super
+      @path = path
+    end
+
+    def message
+      "The asset '#{@path}' was not found in the load path."
+    end
+  end
 end

lib/propshaft/resolver/dynamic.rb

@@ -9,6 +9,8 @@ def initialize(load_path:, prefix:)
     def resolve(logical_path)
       if asset = load_path.find(logical_path)
         File.join prefix, asset.digested_path
+      else
+        raise Propshaft::MissingAssetError.new(logical_path)
       end
     end
   end

lib/propshaft/resolver/static.rb

@@ -9,6 +9,8 @@ def initialize(manifest_path:, prefix:)
     def resolve(logical_path)
       if asset_path = parsed_manifest[logical_path]
         File.join prefix, asset_path
+      else
+        raise Propshaft::MissingAssetError.new(logical_path)
       end
     end
 

test/propshaft/resolver/dynamic_test.rb

@@ -12,7 +12,9 @@ class Propshaft::Resolver::DynamicTest < ActiveSupport::TestCase
       @resolver.resolve("one.txt")
   end
 
-  test "resolving missing asset returns nil" do
-    assert_nil @resolver.resolve("nowhere.txt")
+  test "resolving missing asset raises a custom error" do
+    assert_raise Propshaft::MissingAssetError do
+      assert_nil @resolver.resolve("nowhere.txt")
+    end
   end
 end

test/propshaft/resolver/static_test.rb

@@ -15,7 +15,9 @@ class Propshaft::Resolver::StaticTest < ActiveSupport::TestCase
       @resolver.resolve("one.txt")
   end
 
-  test "resolving missing asset returns nil" do
-    assert_nil @resolver.resolve("nowhere.txt")
+  test "resolving missing asset raises a custom error" do
+    assert_raise Propshaft::MissingAssetError do
+      assert_nil @resolver.resolve("nowhere.txt")
+    end
   end
 end