1 files changed, 77 insertions, 0 deletions
diff --git a/activerecord/test/cases/database_selector_test.rb b/activerecord/test/cases/database_selector_test.rb
new file mode 100644
index 0000000000..f961fa754b
--- /dev/null
+++ b/activerecord/test/cases/database_selector_test.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+require "cases/helper"
+require "models/person"
+require "action_dispatch"
+
+module ActiveRecord
+  class DatabaseSelectorTest < ActiveRecord::TestCase
+    setup do
+      @session_store = {}
+      @session = ActiveRecord::Middleware::DatabaseSelector::Resolver::Session.new(@session_store)
+    end
+
+    def test_empty_session
+      assert_equal Time.at(0), @session.last_write_timestamp
+    end
+
+    def test_writing_the_session_timestamps
+      assert @session.update_last_write_timestamp
+
+      session2 = ActiveRecord::Middleware::DatabaseSelector::Resolver::Session.new(@session_store)
+      assert_equal @session.last_write_timestamp, session2.last_write_timestamp
+    end
+
+    def test_writing_session_time_changes
+      assert @session.update_last_write_timestamp
+
+      before = @session.last_write_timestamp
+      sleep(0.1)
+
+      assert @session.update_last_write_timestamp
+      assert_not_equal before, @session.last_write_timestamp
+    end
+
+    def test_read_from_replicas
+      @session_store[:last_write] = ActiveRecord::Middleware::DatabaseSelector::Resolver::Session.convert_time_to_timestamp(Time.now - 5.seconds)
+
+      resolver = ActiveRecord::Middleware::DatabaseSelector::Resolver.new(@session)
+
+      called = false
+      resolver.read do
+        called = true
+        assert ActiveRecord::Base.connected_to?(role: :reading)
+      end
+      assert called
+    end
+
+    def test_read_from_primary
+      @session_store[:last_write] = ActiveRecord::Middleware::DatabaseSelector::Resolver::Session.convert_time_to_timestamp(Time.now)
+
+      resolver = ActiveRecord::Middleware::DatabaseSelector::Resolver.new(@session)
+
+      called = false
+      resolver.read do
+        called = true
+        assert ActiveRecord::Base.connected_to?(role: :writing)
+      end
+      assert called
+    end
+
+    def test_the_middleware_chooses_writing_role_with_POST_request
+      middleware = ActiveRecord::Middleware::DatabaseSelector.new(lambda { |env|
+        assert ActiveRecord::Base.connected_to?(role: :writing)
+        [200, {}, ["body"]]
+      })
+      assert_equal [200, {}, ["body"]], middleware.call("REQUEST_METHOD" => "POST")
+    end
+
+    def test_the_middleware_chooses_reading_role_with_GET_request
+      middleware = ActiveRecord::Middleware::DatabaseSelector.new(lambda { |env|
+        assert ActiveRecord::Base.connected_to?(role: :reading)
+        [200, {}, ["body"]]
+      })
+      assert_equal [200, {}, ["body"]], middleware.call("REQUEST_METHOD" => "GET")
+    end
+  end
+end