我是一个陌生的关于Rails项目的大红宝石，它是语言，框架和项目本身。因此，我决定运行的第一件事是：
Undefined function 'Add' for input arguments of type 'Interface.91493469_5A91_11CF_8700_00AA0060263B'.
如您所见，在$ bin/rails test
Failure:
validations#test_: validations should validate that :url is case-insensitively unique. [/home/user/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/shoulda-context-1.2.2/lib/shoulda/context/context.rb:346]:
Source did not properly validate that :url is case-insensitively unique.
After taking the given Source, whose :url is
‹"http://beahan.net/jaeden"›, and saving it as the existing record,
then making a new Source and setting its :url to
‹"http://beahan.net/jaeden"› as well, the matcher expected the new
Source to be invalid, but it was valid instead.
bin/rails test /home/user/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/shoulda-context-1.2.2/lib/shoulda/context/context.rb:346
......
Finished in 28.984682s, 11.0058 runs/s, 24.5647 assertions/s.
319 runs, 712 assertions, 1 failures, 0 errors, 0 skips
运行中，只有一个失败，如果我是对的，它不属于我的项目，而是一个依赖项：
319假设这是执行我的项目测试的正确命令，为什么在项目代码库之外会出现故障？