Add unit tests for watchers

test/unit/watcher_test.rb

@@ -0,0 +1,53 @@
+require File.expand_path('../../test_helper', __FILE__)
+
+class WatcherTest < ActiveSupport::TestCase
+  fixtures :projects, :users, :email_addresses, :members, :member_roles, :roles, :enabled_modules,
+           :issues, :issue_statuses, :enumerations, :trackers, :projects_trackers,
+           :boards, :messages,
+           :wikis, :wiki_pages,
+           :watchers
+
+  def setup
+    @author = User.find(1)
+    @assigned_user = User.find(2)
+    @changing_user = User.find(4)
+  end
+
+  def test_new_issue_with_author_watch_only
+    User.current = @author
+    issue = Issue.generate(author_id: @author.id)
+    issue.save
+    assert_equal 1, issue.watchers.count
+    assert issue.watched_by?(@author)
+  end
+
+  def test_new_issue_with_author_and_assigned_to_watchers
+    User.current = @author
+    issue = Issue.generate(author_id: @author.id, assigned_to: @assigned_user)
+    issue.save
+
+    assert_equal 2, issue.watchers.count
+    assert issue.watched_by?(@author)
+    assert issue.watched_by?(@assigned_user)
+  end
+
+  def test_issue_do_not_add_author_with_user_change
+    User.current = @author
+
+    issue = Issue.generate(author_id: @author.id, assigned_to: @assigned_user)
+    issue.save
+    assert_equal 2, issue.watchers.count
+
+    issue.remove_watcher(@author)
+    issue.reload
+    assert_equal 1, issue.watchers.count
+
+    User.current = @changing_user
+    issue.subject = 'Changing....'
+    issue.save
+
+    assert_equal 2, issue.watchers.count
+    assert issue.watched_by?(@changing_user)
+    assert issue.watched_by?(@assigned_user)
+  end
+end