为什么不'；RSpec匹配器工作吗？

当我使用任何基本匹配器运行这个简单的RSpec时，它都不起作用：

文件：

使用的任何匹配器的输出如下所示：

/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'

/private/tmp/rspec_matcher_test/matcher_spec.rb:3:in'block in'：未定义的局部变量或方法'be_true'（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'
来自/Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:242:“子类”中
from/Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:228:在“描述”中
from/Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/dsl.rb:18:在“描述”中
from/private/tmp/rspec\u matcher\u test/matcher\u spec.rb:2:in`'
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:“加载规范文件中的块”
from/Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in'each'
来自/Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:“加载规范文件”
from/Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/command_-line.rb:22:在“运行”中
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“自动运行中的块”

---

（是的，我是）

这是因为您忘记了描述块下面的“it”块。RSpec DSL不知道描述块范围内的匹配器

要修复它，只需添加一个“it”块：

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

问题症状：您会看到类似的错误，如下所示

_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)

\u spec.rb:4:in'block in'：未定义的#（NoMethodError）方法'be'
_spec.rb:6:in'block in'：未定义的局部变量或#的方法'be_false'（NameError）
_规范rb:7:in'block in'：未定义的局部变量或#的方法'be_nil'（NameError）
_spec.rb:8:in'block in'：未定义的局部变量或#的方法'be_nil'（NameError）
_spec.rb:18:in'block in'：未定义的局部变量或#的方法'be_empty'（NameError）
_规范rb:22:in“block in”：未定义的#（NoMethodError）方法“eq”
_规范rb:26:in'block-in:#（NoMethodError）的未定义方法'eql'
_规范rb:27:in'block-in:#（NoMethodError）的未定义方法'equal'
_规范rb:12:in'block in:#的未定义方法'match'（NoMethodError）
_规范rb:13:in'block in'：未定义的方法'be#u in'（NoMethodError）
_规范rb:19:in'block in'：未定义的方法'have#u key'（NoMethodError）
_规范rb:15:in“block in”：未定义的方法“cover”表示#（NoMethodError）
_规范rb:16:in'block in'：未定义的#（NoMethodError）方法'expect'
_spec.rb:14:'include'中：错误的参数类型Fixnum（预期模块）（TypeError）

（包括在内，因此有相同问题的人可能会偶然发现这一点……特别是因为最后一个错误并没有给出问题所在的提示。）

_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)