Replace factory_girl_rails with factory_bot_railsrc/use-factory_bot_rails

I've followed the [upgrade guide](https://github.com/thoughtbot/factory_bot/blob/4-9-0-stable/UPGRADE_FROM_FACTORY_GIRL.md) and ran these two commands:

```
grep -e FactoryGirl **/*.rake **/*.rb -s -l | xargs sed -i "" "s|FactoryGirl|FactoryBot|"
grep -e factory_girl **/*.rake **/*.rb -s -l | xargs sed -i "" "s|factory_girl|factory_bot|"
```

Signed-off-by: Rémy Coutable <remy@rymai.me>

3 files changed, 10 insertions, 10 deletions

diff --git a/doc/development/gotchas.md b/doc/development/gotchas.md
index c2ca8966a3f..5786287d00c 100644
--- a/doc/development/gotchas.md
+++ b/doc/development/gotchas.md
@@ -8,7 +8,7 @@ might encounter or should avoid during development of GitLab CE and EE.
 Consider the following factory:
 
 ```ruby
-FactoryGirl.define do
+FactoryBot.define do
   factory :label do
     sequence(:title) { |n| "label#{n}" }
   end
@@ -53,7 +53,7 @@ When run, this spec doesn't do what we might expect:
      (compared using ==)
 ```
 
-That's because FactoryGirl sequences are not reseted for each example.
+That's because FactoryBot sequences are not reseted for each example.
 
 Please remember that sequence-generated values exist only to avoid having to
 explicitly set attributes that have a uniqueness constraint when using a factory.
diff --git a/doc/development/testing_guide/best_practices.md b/doc/development/testing_guide/best_practices.md
index 8b7b015427f..edb8f372ea3 100644
--- a/doc/development/testing_guide/best_practices.md
+++ b/doc/development/testing_guide/best_practices.md
@@ -8,8 +8,8 @@ and effective _as well as_ fast.
 
 Here are some things to keep in mind regarding test performance:
 
-- `double` and `spy` are faster than `FactoryGirl.build(...)`
-- `FactoryGirl.build(...)` and `.build_stubbed` are faster than `.create`.
+- `double` and `spy` are faster than `FactoryBot.build(...)`
+- `FactoryBot.build(...)` and `.build_stubbed` are faster than `.create`.
 - Don't `create` an object when `build`, `build_stubbed`, `attributes_for`,
   `spy`, or `double` will do. Database persistence is slow!
 - Don't mark a feature as requiring JavaScript (through `@javascript` in
@@ -254,13 +254,13 @@ end
 
 ### Factories
 
-GitLab uses [factory_girl] as a test fixture replacement.
+GitLab uses [factory_bot] as a test fixture replacement.
 
 - Factory definitions live in `spec/factories/`, named using the pluralization
   of their corresponding model (`User` factories are defined in `users.rb`).
 - There should be only one top-level factory definition per file.
-- FactoryGirl methods are mixed in to all RSpec groups. This means you can (and
-  should) call `create(...)` instead of `FactoryGirl.create(...)`.
+- FactoryBot methods are mixed in to all RSpec groups. This means you can (and
+  should) call `create(...)` instead of `FactoryBot.create(...)`.
 - Make use of [traits] to clean up definitions and usages.
 - When defining a factory, don't define attributes that are not required for the
   resulting record to pass validation.
@@ -269,8 +269,8 @@ GitLab uses [factory_girl] as a test fixture replacement.
 - Factories don't have to be limited to `ActiveRecord` objects.
   [See example](https://gitlab.com/gitlab-org/gitlab-ce/commit/0b8cefd3b2385a21cfed779bd659978c0402766d).
 
-[factory_girl]: https://github.com/thoughtbot/factory_girl
-[traits]: http://www.rubydoc.info/gems/factory_girl/file/GETTING_STARTED.md#Traits
+[factory_bot]: https://github.com/thoughtbot/factory_bot
+[traits]: http://www.rubydoc.info/gems/factory_bot/file/GETTING_STARTED.md#Traits
 
 ### Fixtures
 
diff --git a/doc/development/testing_guide/index.md b/doc/development/testing_guide/index.md
index 8045bbad7ba..65386f231a0 100644
--- a/doc/development/testing_guide/index.md
+++ b/doc/development/testing_guide/index.md
@@ -33,7 +33,7 @@ changes should be tested.
 
 ## [Testing best practices](best_practices.md)
 
-Everything you should know about how to write good tests: RSpec, FactoryGirl,
+Everything you should know about how to write good tests: RSpec, FactoryBot,
 system tests, parameterized tests etc.
 
 ---