2 files changed, 20 insertions, 3 deletions
diff --git a/activejob/test/cases/argument_serialization_test.rb b/activejob/test/cases/argument_serialization_test.rb
index 8f51a2d238..4e26b9a178 100644
--- a/activejob/test/cases/argument_serialization_test.rb
+++ b/activejob/test/cases/argument_serialization_test.rb
@@ -14,7 +14,7 @@ class ArgumentSerializationTest < ActiveSupport::TestCase
   [ nil, 1, 1.0, 1_000_000_000_000_000_000_000,
     "a", true, false, BigDecimal.new(5),
     :a, 1.day, Date.new(2001, 2, 3), Time.new(2002, 10, 31, 2, 2, 2, "+02:00"),
-    DateTime.new(2001, 2, 3, 4, 5, 6, '+03:00'),
+    DateTime.new(2001, 2, 3, 4, 5, 6, "+03:00"),
     ActiveSupport::TimeWithZone.new(Time.utc(1999, 12, 31, 23, 59, 59), ActiveSupport::TimeZone["UTC"]),
     [ 1, "a" ],
     { "a" => 1 }
diff --git a/activejob/test/cases/serializers_test.rb b/activejob/test/cases/serializers_test.rb
index 207ae55b49..a86f168d03 100644
--- a/activejob/test/cases/serializers_test.rb
+++ b/activejob/test/cases/serializers_test.rb
@@ -58,7 +58,24 @@ class SerializersTest < ActiveSupport::TestCase
 
   test "won't deserialize unknown hash" do
     hash = { "_dummy_serializer" => 123, "_aj_symbol_keys" => [] }
-    assert_equal({ "_dummy_serializer" => 123 }, ActiveJob::Serializers.deserialize(hash))
+    error = assert_raises(ArgumentError) do
+      ActiveJob::Serializers.deserialize(hash)
+    end
+    assert_equal(
+      'Serializer name is not present in the argument: {"_dummy_serializer"=>123, "_aj_symbol_keys"=>[]}',
+      error.message
+    )
+  end
+
+  test "won't deserialize unknown serializer" do
+    hash = { "_aj_serialized" => "DoNotExist", "value" => 123 }
+    error = assert_raises(ArgumentError) do
+      ActiveJob::Serializers.deserialize(hash)
+    end
+    assert_equal(
+      "Serializer DoNotExist is not know",
+      error.message
+    )
   end
 
   test "will deserialize know serialized objects" do
@@ -74,7 +91,7 @@ class SerializersTest < ActiveSupport::TestCase
 
   test "can't add serializer with the same key twice" do
     ActiveJob::Serializers.add_serializers DummySerializer
-    assert_no_difference(-> { ActiveJob::Serializers.serializers.size } ) do
+    assert_no_difference(-> { ActiveJob::Serializers.serializers.size }) do
       ActiveJob::Serializers.add_serializers DummySerializer
     end
   end