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Feature: access running example

In order to take advantage of services that are available
in my examples when I'm writing matchers
As a spec author
I want to call methods on the running example

If the method exists in the context of the example, it gets
called. If not, a NoMethodError is raised on the Matcher itself
(not the example).

Scenario: call method defined on example from matcher
Given a file named "example_spec.rb" with:
"""
RSpec::Matchers.define :bar do
match do |_|
foo == "foo"
end
end

describe "something" do
def foo
"foo"
end

it "does something" do
"foo".should bar
end
end
"""
When I run `rspec ./example_spec.rb`
Then the output should contain "1 example, 0 failures"

Scenario: call method _not_ defined on example from matcher
Given a file named "example_spec.rb" with:
"""
RSpec::Matchers.define :bar do
match do |_|
foo == "foo"
end
end

describe "something" do
it "does something" do
"foo".should bar
end
end
"""
When I run `rspec ./example_spec.rb`
Then the output should contain "1 example, 1 failure"
And the output should match /undefined.*method/
And the output should contain "RSpec::Matchers::DSL::Matcher"
And the output should not contain "ExampleGroup"
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