add more tests to models

spec/fabricators/account_fabricator.rb

@@ -1,3 +1,3 @@
 Fabricator(:account) do
-  username "alice"
+  username { Faker::Internet.user_name(nil, %w(_)) }
 end

spec/fabricators/block_fabricator.rb

@@ -1,3 +1,4 @@
 Fabricator(:block) do
-
+  account
+  target_account { Fabricate(:account) }
 end

spec/fabricators/follow_fabricator.rb

@@ -1,3 +1,4 @@
 Fabricator(:follow) do
-
+  account
+  target_account { Fabricate(:account) }
 end

spec/fabricators/follow_request_fabricator.rb

@@ -1,3 +1,4 @@
 Fabricator(:follow_request) do
-
+  account
+  target_account { Fabricate(:account) }
 end

spec/fabricators/mention_fabricator.rb

@@ -0,0 +1,4 @@
+Fabricator(:mention) do
+  account
+  status
+end

spec/fabricators/user_fabricator.rb

@@ -1,6 +1,6 @@
 Fabricator(:user) do
   account
-  email        "alice@example.com"
+  email        { Faker::Internet.email }
   password     "123456789"
   confirmed_at { Time.now }
 end