1 files changed, 9 insertions, 0 deletions
diff --git a/activerecord/test/cases/adapters/postgresql/infinity_test.rb b/activerecord/test/cases/adapters/postgresql/infinity_test.rb
index 24199c69b8..d9d7832094 100644
--- a/activerecord/test/cases/adapters/postgresql/infinity_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/infinity_test.rb
@@ -24,6 +24,15 @@ class PostgresqlInfinityTest < ActiveRecord::TestCase
     assert_equal Float::INFINITY, record.float
   end
 
+  test "type casting string on a float column" do
+    record = PostgresqlInfinity.new(float: 'Infinity')
+    assert_equal Float::INFINITY, record.float
+    record = PostgresqlInfinity.new(float: '-Infinity')
+    assert_equal(-Float::INFINITY, record.float)
+    record = PostgresqlInfinity.new(float: 'NaN')
+    assert_send [record.float, :nan?]
+  end
+
   test "update_all with infinity on a float column" do
     record = PostgresqlInfinity.create!
     PostgresqlInfinity.update_all(float: Float::INFINITY)