DEV: Move discourse-chat to the core repo. (#18776)

As part of this move, we are also renaming `discourse-chat` to `chat`.

plugins/chat/spec/lib/post_notification_handler_spec.rb

@@ -0,0 +1,119 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe Chat::PostNotificationHandler do
+  let(:acting_user) { Fabricate(:user) }
+  let(:post) { Fabricate(:post) }
+  let(:notified_users) { [] }
+  let(:subject) { Chat::PostNotificationHandler.new(post, notified_users) }
+
+  fab!(:channel) { Fabricate(:category_channel) }
+  fab!(:message1) do
+    Fabricate(:chat_message, chat_channel: channel, message: "hey this is the first message :)")
+  end
+  fab!(:message2) do
+    Fabricate(
+      :chat_message,
+      chat_channel: channel,
+      message: "our true enemy. has yet. to reveal himself.",
+    )
+  end
+
+  before { Notification.destroy_all }
+
+  def expect_no_notification
+    return_val = nil
+    expect { return_val = subject.handle }.not_to change { Notification.count }
+    expect(return_val).to eq(false)
+  end
+
+  def update_post_with_chat_quote(messages)
+    quote_markdown =
+      ChatTranscriptService.new(channel, acting_user, messages_or_ids: messages).generate_markdown
+    post.update!(raw: post.raw + "\n\n" + quote_markdown)
+  end
+
+  it "does nothing if the post is a whisper" do
+    post.update(post_type: Post.types[:whisper])
+    expect_no_notification
+  end
+
+  it "does nothing if the topic is deleted" do
+    post.topic.destroy && post.reload
+    expect_no_notification
+  end
+
+  it "does nothing if the topic is a private message" do
+    post.update(topic: Fabricate(:private_message_topic))
+    expect_no_notification
+  end
+
+  it "sends notifications to all of the quoted users" do
+    update_post_with_chat_quote([message1, message2])
+    subject.handle
+    expect(
+      Notification.where(
+        user: message1.user,
+        notification_type: Notification.types[:chat_quoted],
+      ).count,
+    ).to eq(1)
+    expect(
+      Notification.where(
+        user: message2.user,
+        notification_type: Notification.types[:chat_quoted],
+      ).count,
+    ).to eq(1)
+  end
+
+  it "does not send the same chat_quoted notification twice to the same post and user" do
+    update_post_with_chat_quote([message1, message2])
+    subject.handle
+    subject.handle
+    expect(
+      Notification.where(
+        user: message1.user,
+        notification_type: Notification.types[:chat_quoted],
+      ).count,
+    ).to eq(1)
+  end
+
+  it "does not send a notification if the user has got a reply notification to the quoted user for the same post" do
+    update_post_with_chat_quote([message1, message2])
+    Fabricate(
+      :notification,
+      notification_type: Notification.types[:replied],
+      post_number: post.post_number,
+      topic: post.topic,
+      user: message1.user,
+    )
+    subject.handle
+    expect(
+      Notification.where(
+        user: message1.user,
+        notification_type: Notification.types[:chat_quoted],
+      ).count,
+    ).to eq(0)
+  end
+
+  context "when some users have already been notified for the post" do
+    let(:notified_users) { [message1.user] }
+
+    it "does not send notifications to those users" do
+      update_post_with_chat_quote([message1, message2])
+      subject.handle
+      expect(
+        Notification.where(
+          user: message1.user,
+          notification_type: Notification.types[:chat_quoted],
+        ).count,
+      ).to eq(0)
+      expect(
+        Notification.where(
+          user: message2.user,
+          notification_type: Notification.types[:chat_quoted],
+        ).count,
+      ).to eq(1)
+    end
+  end
+end