Add non transactional search tests

MySQL fulltext indexes are only updated on commit. Use a single test in
each file to avoid repeated setup.

test/models/comment/searchable_test.rb

@@ -0,0 +1,60 @@
+require "test_helper"
+
+class Comment::SearchableTest < ActiveSupport::TestCase
+  self.use_transactional_tests = false
+
+  setup do
+    ActiveRecord::Base.connection.execute "DELETE FROM search_index"
+    Account.find_by(name: "Search Test")&.destroy
+
+    @account = Account.create!(name: "Search Test")
+    @user = User.create!(name: "Test User", account: @account)
+    @board = Board.create!(name: "Test Board", account: @account, creator: @user)
+    @card = @board.cards.create!(title: "Test Card", creator: @user)
+  end
+
+  teardown do
+    ActiveRecord::Base.connection.execute "DELETE FROM search_index"
+    Account.find_by(name: "Search Test")&.destroy
+  end
+
+  test "comment search" do
+    # Comment is indexed on create
+    comment = @card.comments.create!(body: "searchable comment text", creator: @user)
+    result = ActiveRecord::Base.connection.execute(
+      "SELECT COUNT(*) FROM search_index WHERE searchable_type = 'Comment' AND searchable_id = #{comment.id}"
+    ).first[0]
+    assert_equal 1, result
+
+    # Comment is updated in index
+    comment.update!(body: "updated text")
+    content = ActiveRecord::Base.connection.execute(
+      "SELECT content FROM search_index WHERE searchable_type = 'Comment' AND searchable_id = #{comment.id}"
+    ).first[0]
+    assert_match /updat/, content
+
+    # Comment is removed from index on destroy
+    comment_id = comment.id
+    comment.destroy
+    result = ActiveRecord::Base.connection.execute(
+      "SELECT COUNT(*) FROM search_index WHERE searchable_type = 'Comment' AND searchable_id = #{comment_id}"
+    ).first[0]
+    assert_equal 0, result
+
+    # Finding cards via comment search
+    card_with_comment = @board.cards.create!(title: "Card One", creator: @user)
+    card_with_comment.comments.create!(body: "unique searchable phrase", creator: @user)
+    card_without_comment = @board.cards.create!(title: "Card Two", creator: @user)
+    results = Card.mentioning("searchable", board_ids: [@board.id])
+    assert_includes results, card_with_comment
+    assert_not_includes results, card_without_comment
+
+    # Comment stores parent card_id and board_id
+    new_comment = @card.comments.create!(body: "test comment", creator: @user)
+    row = ActiveRecord::Base.connection.execute(
+      "SELECT card_id, board_id FROM search_index WHERE searchable_type = 'Comment' AND searchable_id = #{new_comment.id}"
+    ).first
+    assert_equal @card.id, row[0]
+    assert_equal @board.id, row[1]
+  end
+end