ローカルマシンで壊れた仕様（specs）についてお手伝いをお願いできますでしょうか。今朝最新の master をクローンしたところ、ローカルマシンで 4 つの仕様が失敗しています：
1) Wizard::Builder colors step when the default them hass been override should set the right default values
Failure/Error: expect(field.required).to eq(false)
expected: false
got: true
(compared using ==)
# ./spec/components/wizard/wizard_builder_spec.rb:171:in `block (4 levels) in <main>'
2) Wizard::Builder colors step when the default theme has not been override should set the right default values
Failure/Error: SiteSetting.find_by(name: "default_theme_id").destroy!
NoMethodError:
undefined method `destroy!' for nil:NilClass
# ./spec/components/wizard/wizard_builder_spec.rb:156:in `block (4 levels) in <main>'
3) ApplicationController#handle_theme selects the theme the user has selected
Failure/Error: expect(controller.theme_ids).to eq([SiteSetting.default_theme_id])
expected: [-1]
got: []
(compared using ==)
# ./spec/requests/application_controller_spec.rb:295:in `block (3 levels) in <main>'
4) ApplicationController#handle_theme does not allow non privileged user to preview themes
Failure/Error: expect(controller.theme_ids).to eq([SiteSetting.default_theme_id])
expected: [-1]
got: []
(compared using ==)
# ./spec/requests/application_controller_spec.rb:341:in `block (3 levels) in <main>'
私は postgres 11.5 を実行しており、discourse_development および discourse_test に対して hstore と pg_trgm 拡張機能が有効になっていることを確認しました：
➜ discourse-master git:(master) ✗ psql --user lis2 discourse_development
psql (11.5 (Ubuntu 11.5-0ubuntu0.19.04.1))
Type "help" for help.
discourse_development=# \dx
List of installed extensions
Name | Version | Schema | Description
---------+---------+------------+-------------------------------------------------------------------
hstore | 1.5 | public | data type for storing sets of (key, value) pairs
pg_trgm | 1.4 | public | text similarity measurement and index searching based on trigrams
plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language
以下は、すべての gem とそのバージョンのリストです：
rake 12.3.2
concurrent-ruby 1.1.5
i18n 1.6.0
minitest 5.11.3
thread_safe 0.3.6
tzinfo 1.2.5
activesupport 5.2.3
builder 3.2.3
erubi 1.8.0
mini_portile2 2.4.0
nokogiri 1.10.4
rails-dom-testing 2.0.3
crass 1.0.4
loofah 2.2.3
rails-html-sanitizer 1.0.4
actionview 5.2.3
rack 2.0.7
rack-test 1.1.0
actionpack 5.2.3
globalid 0.4.2
activejob 5.2.3
mini_mime 1.0.1
mail 2.7.1
actionmailer 5.2.3
activemodel 5.2.3
active_model_serializers 0.8.4
arel 9.0.0
activerecord 5.2.3
public_suffix 3.0.3
addressable 2.5.2
annotate 2.7.5
ast 2.4.0
aws-eventstream 1.0.3
aws-partitions 1.154.0
aws-sigv4 1.1.0
jmespath 1.4.0
aws-sdk-core 3.48.6
aws-sdk-kms 1.17.0
aws-sdk-s3 1.36.1
aws-sdk-sns 1.13.0
ember-source 2.18.2
execjs 2.7.0
barber 0.12.2
coderay 1.1.2
better_errors 2.5.1
debug_inspector 0.0.3
binding_of_caller 0.8.0
msgpack 1.2.10
bootsnap 1.4.4
uniform_notifier 1.12.1
bullet 6.0.0
bundler 1.17.3
byebug 11.0.1
certified 1.0.0
chunky_png 1.3.11
colored2 3.1.2
connection_pool 2.2.2
cppjieba_rb 0.3.3
safe_yaml 1.0.5
crack 0.4.3
css_parser 1.7.0
diff-lcs 1.3
diffy 3.3.0
discourse-ember-source 3.10.0.1
exifr 1.3.6
fspath 3.1.0
image_size 1.5.0
in_threads 1.5.1
progress 3.5.0
discourse_image_optim 0.26.2
docile 1.3.1
email_reply_trimmer 0.1.12
ember-data-source 3.0.2
sprockets 3.7.2
ember-handlebars-template 0.8.0
method_source 0.9.2
thor 0.20.3
railties 5.2.3
jquery-rails 4.3.3
ember-rails 0.18.5
excon 0.64.0
fabrication 2.20.1
fakeweb 1.3.0
multipart-post 2.1.1
faraday 0.15.4
fast_blank 1.0.0
rake-compiler 1.0.7
fast_xor 1.1.3
fast_xs 0.8.0
fastimage 2.1.5
ffi 1.10.0
flamegraph 0.9.5
gc_tracer 1.5.1
guess_html_encoding 0.0.11
hashdiff 0.3.9
hashie 3.6.0
highline 1.7.10
hiredis 0.6.3
hkdf 0.3.0
htmlentities 4.3.4
http_accept_language 2.0.5
jaro_winkler 1.5.2
json 2.2.0
jwt 2.2.1
kgio 2.11.2
libv8 7.3.492.27.1 (x86_64-linux)
rb-fsevent 0.10.3
rb-inotify 0.10.0
ruby_dep 1.5.0
listen 3.1.5
request_store 1.4.1
lograge 0.11.0
logstash-event 1.2.02
logstash-logger 0.26.1
logster 2.3.2
lru_redux 1.1.0
lz4-ruby 0.3.3
maxminddb 0.1.22
memory_profiler 0.9.13
message_bus 2.2.2
metaclass 0.0.4
mini_racer 0.2.6
rack-protection 2.0.7
redis 4.0.1
sidekiq 5.2.7
mini_scheduler 0.12.1
mini_sql 0.2.2
mini_suffix 0.3.0
mocha 1.8.0
mock_redis 0.19.0
moneta 1.1.1
multi_json 1.13.1
multi_xml 0.6.0
mustache 1.1.0
nokogumbo 2.0.1
oauth 0.5.4
oauth2 1.4.1
oj 3.7.12
omniauth 1.9.0
omniauth-oauth2 1.6.0
omniauth-facebook 5.0.0
omniauth-github 1.3.0
omniauth-google-oauth2 0.7.0
omniauth-instagram 1.3.0
omniauth-oauth 1.1.0
ruby-openid 2.7.0
rack-openid 1.3.1
omniauth-openid 1.0.1
omniauth-twitter 1.4.0
sanitize 5.0.0
onebox 1.9.12
openid-redis-store 0.0.2
optimist 3.0.0
parallel 1.17.0
parallel_tests 2.28.0
parser 2.6.3.0
pg 1.1.4
pry 0.12.2
pry-nav 0.3.0
pry-rails 0.3.9
puma 3.12.1
r2 0.2.7
rack-mini-profiler 1.0.2
rails_multisite 2.0.7
rainbow 3.0.0
raindrops 0.19.0
rbtrace 0.4.11
rchardet 1.8.0
redis-namespace 1.6.0
rinku 2.0.6
rotp 3.3.1
rqrcode 0.10.1
rspec-support 3.8.0
rspec-core 3.8.0
rspec-expectations 3.8.3
rspec-mocks 3.8.0
rspec 3.8.0
rspec-html-matchers 0.9.1
rspec-rails 3.8.2
rtlit 0.0.5
ruby-progressbar 1.10.0
unicode-display_width 1.6.0
rubocop 0.69.0
ruby-prof 0.17.0
ruby-readability 0.7.0
rubyzip 1.2.3
sassc 2.0.1
sprockets-rails 3.2.1
tilt 2.0.9
sassc-rails 2.1.1
seed-fu 2.3.9
shoulda-matchers 3.1.3
simplecov-html 0.10.2
simplecov 0.16.1
sshkey 2.0.0
stackprof 0.2.12
test-prof 0.9.0
uglifier 4.1.20
unf_ext 0.0.7.6
unf 0.1.4
unicorn 5.5.1
webmock 3.5.1
webpush 0.3.8
yaml-lint 0.0.10
仕様を失敗させる（赤くする）ような異常な点が見当たりますでしょうか？お手伝いいただきありがとうございます。