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Feature: Stub Defined Constant
Use `stub_const` to stub constants. When the constant is already defined,
the stubbed value will replace the original value for the duration of the
example.
Scenario: Stub top-level constant
Given a file named "stub_const_spec.rb" with:
"""ruby
FOO = 7
describe "stubbing FOO" do
it "can stub FOO with a different value" do
stub_const("FOO", 5)
FOO.should eq(5)
end
it "restores the stubbed constant when the example completes" do
FOO.should eq(7)
end
end
"""
When I run `rspec stub_const_spec.rb`
Then the examples should all pass
Scenario: Stub nested constant
Given a file named "stub_const_spec.rb" with:
"""ruby
module MyGem
class SomeClass
FOO = 7
end
end
module MyGem
describe SomeClass do
it "stubs the nested constant when it is fully qualified" do
stub_const("MyGem::SomeClass::FOO", 5)
SomeClass::FOO.should eq(5)
end
end
end
"""
When I run `rspec stub_const_spec.rb`
Then the examples should all pass
Scenario: Transfer nested constants
Given a file named "stub_const_spec.rb" with:
"""ruby
module MyGem
class SomeClass
FOO = 7
end
end
module MyGem
describe SomeClass do
let(:fake_class) { Class.new }
it "does not transfer nested constants by default" do
stub_const("MyGem::SomeClass", fake_class)
expect { SomeClass::FOO }.to raise_error(NameError)
end
it "transfers nested constants when using :transfer_nested_constants => true" do
stub_const("MyGem::SomeClass", fake_class, :transfer_nested_constants => true)
SomeClass::FOO.should eq(7)
end
it "can specify a list of nested constants to transfer" do
stub_const("MyGem::SomeClass", fake_class, :transfer_nested_constants => [:FOO])
SomeClass::FOO.should eq(7)
end
end
end
"""
When I run `rspec stub_const_spec.rb`
Then the examples should all pass
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