Consolidate testing of update_all type casting

We have several test cases on "tricky" types that are essentially
testing that `update_all` goes through the same type casting behavior as
a normal assignment + save. We recently had another case to add this
test for another type in https://github.com/rails/rails/pull/12742.

Rather than testing this separately for every type which is "tricky"
when round tripping, let's instead have a fairly exhaustive test that
ensures we're getting the correct values at every step for `update_all`.
Given the structure of the code now, we can be confident that if the
type is correct, and `update_all` is type casting correctly, we're going
to get the right behavior for all types.

1 files changed, 0 insertions, 10 deletions

diff --git a/activerecord/test/cases/adapters/postgresql/json_test.rb b/activerecord/test/cases/adapters/postgresql/json_test.rb
index 4cdb4a4893..e44afea33a 100644
--- a/activerecord/test/cases/adapters/postgresql/json_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/json_test.rb
@@ -155,16 +155,6 @@ class PostgresqlJSONTest < ActiveRecord::TestCase
     assert_equal "320×480", y.resolution
   end
 
-  def test_update_all
-    json = JsonDataType.create! payload: { "one" => "two" }
-
-    JsonDataType.update_all payload: { "three" => "four" }
-    assert_equal({ "three" => "four" }, json.reload.payload)
-
-    JsonDataType.update_all payload: { }
-    assert_equal({ }, json.reload.payload)
-  end
-
   def test_changes_in_place
     json = JsonDataType.new
     assert_not json.changed?