Почему не работают RSpec-совместители?

Question

Когда я запускаю эту простую RSpec с любой основной согласованью, он не работает:

Файл: matcher_spec.rb

describe "a simple RSpec matcher" do 
    true.should be_true 
end 

Вывод, для любой согласовани используется, выглядит так:

/private/tmp/rspec_matcher_test/matcher_spec.rb:3:in `block in <top (required)>': undefined local variable or method `be_true' for #<Class:0x007fdcd60ccb40> (NameError) 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:242:in `module_eval' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:242:in `subclass' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:228:in `describe' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/dsl.rb:18:in `describe' 
    from /private/tmp/rspec_matcher_test/matcher_spec.rb:2:in `<top (required)>' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `block in load_spec_files' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `each' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load_spec_files' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/command_line.rb:22:in `run' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:80:in `run' 
    from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:17:in `block in autorun' 

_{(да, я answering my own question)}

Answer 1

Это потому, что вы забыли блок «it» под блок описания. RSpec DSL не знает о матчи в рамках описываемого блока.

Чтобы исправить это, просто добавьте «это» блок:

describe "a simple RSpec matcher" do 
    it "should work now" do 
    true.should be_true 
    end 
end 

Признак проблемы: вы видите подобные ошибки как следующий

_spec.rb:4:in `block in <top (required)>': undefined method `be' for #<Class:0x007f9ce20ea458> (NoMethodError) 

_spec.rb:6:in `block in <top (required)>': undefined local variable or method `be_false' for #<Class:0x007fc59b0d2358> (NameError) 

_spec.rb:7:in `block in <top (required)>': undefined local variable or method `be_nil' for #<Class:0x007fb5912afeb0> (NameError) 

_spec.rb:8:in `block in <top (required)>': undefined local variable or method `be_nil' for #<Class:0x007f9a6d21f278> (NameError) 

_spec.rb:18:in `block in <top (required)>': undefined local variable or method `be_empty' for #<Class:0x007fdff23260e8> (NameError) 

_spec.rb:22:in `block in <top (required)>': undefined method `eq' for #<Class:0x007f9ac2a30110> (NoMethodError) 

_spec.rb:26:in `block in <top (required)>': undefined method `eql' for #<Class:0x007fe45c188588> (NoMethodError) 

_spec.rb:27:in `block in <top (required)>': undefined method `equal' for #<Class:0x007fc30c9a6a10> (NoMethodError) 

_spec.rb:12:in `block in <top (required)>': undefined method `match' for #<Class:0x007fb142909160> (NoMethodError) 

_spec.rb:13:in `block in <top (required)>': undefined method `be_within' for #<Class:0x007fe47da21728> (NoMethodError) 

_spec.rb:19:in `block in <top (required)>': undefined method `have_key' for #<Class:0x007f9adc0df1c8> (NoMethodError) 

_spec.rb:15:in `block in <top (required)>': undefined method `cover' for #<Class:0x007f868a304090> (NoMethodError) 

_spec.rb:16:in `block in <top (required)>': undefined method `expect' for #<Class:0x007fbe62a8b2e0> (NoMethodError) 

_spec.rb:14:in `include': wrong argument type Fixnum (expected Module) (TypeError) 

_{(в комплекте, чтобы люди с той же проблемой может наткнуться на это ... тем более, что эта последняя ошибка не дает большого намека на то, что проблема.)}