Merge pull request #23373 from kamipo/remove_duplicated_composite_primary_key_tests

Remove duplicated composite primary key tests

activerecord/test/cases/adapters/postgresql/postgresql_adapter_test.rb

@@ -53,14 +53,6 @@ def test_primary_key_returns_nil_for_no_pk
         end
       end
 
-      def test_composite_primary_key
-        with_example_table 'id serial, number serial, PRIMARY KEY (id, number)' do
-          silence_warnings do
-            assert_nil @connection.primary_key('ex')
-          end
-        end
-      end
-
       def test_primary_key_raises_error_if_table_not_found
         assert_raises(ActiveRecord::StatementInvalid) do
           @connection.primary_key('unobtainium')

activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb

@@ -400,14 +400,6 @@ def test_no_primary_key
         end
       end
 
-      def test_composite_primary_key
-        with_example_table 'id integer, number integer, foo integer, PRIMARY KEY (id, number)' do
-          silence_warnings do
-            assert_nil @conn.primary_key('ex')
-          end
-        end
-      end
-
       def test_supports_extensions
         assert_not @conn.supports_extensions?, 'does not support extensions'
       end

activerecord/test/cases/primary_keys_test.rb

@@ -262,7 +262,7 @@ def test_composite_primary_key
 
   def test_primary_key_issues_warning
     warning = capture(:stderr) do
-      @connection.primary_key("barcodes")
+      assert_nil @connection.primary_key("barcodes")
     end
     assert_match(/WARNING: Rails does not support composite primary key\./, warning)
   end