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Feature: General matchers

The `anything`, `any_args`, and `no_args` matchers can be used to require the method
to have arguments (or not) without constraining the details of the argument, such as its
type, pattern or value. The `anything` matcher only reflects a single argument, while
the `any_args` matcher matches any arity.

Scenario: anything argument matcher
Given a file named "stub_anything_args_spec.rb" with:
"""ruby
describe "stubbed anything() args spec" do
it "works" do
object = Object.new
object.stub(:foo).with(anything) do
"anything"
end

object.foo(1).should eq("anything")
object.foo(:that).should eq("anything")
end
end
"""
When I run `rspec stub_anything_args_spec.rb`
Then the output should contain "1 example, 0 failures"

Scenario: any_args argument matcher
Given a file named "stub_any_args_spec.rb" with:
"""ruby
describe "stubbed any_args() args spec" do
it "works" do
object = Object.new
object.stub(:foo).with(any_args) do
"anything"
end

object.foo(1).should eq("anything")
object.foo(:that).should eq("anything")
object.foo.should eq("anything")
end
end
"""
When I run `rspec stub_any_args_spec.rb`
Then the output should contain "1 example, 0 failures"

Scenario: no_args argument matcher
Given a file named "stub_no_args_spec.rb" with:
"""ruby
describe "stubbed no_args() args spec" do
it "works for no args" do
object = Object.new
object.stub(:foo).with(no_args) do
"nothing"
end
object.stub(:foo).with(anything) do
"something"
end

object.foo(:that).should eq("something")
object.foo.should eq("nothing")
end
end
"""
When I run `rspec stub_no_args_spec.rb`
Then the output should contain "1 example, 0 failures"

Scenario: no_args argument matcher for expectations
Given a file named "stub_no_args_expectations_spec.rb" with:
"""ruby
describe "stubbed no_args() args spec for expectations" do
it "works for no args" do
object = Object.new
object.should_receive(:foo).with(no_args)

object.foo
end
it "fails for args" do
object = Object.new
object.should_receive(:foo).with(no_args)

object.foo(:bar)
end
end
"""
When I run `rspec stub_no_args_expectations_spec.rb`
Then the output should contain "2 examples, 1 failure"
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