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module RSpec
module Mocks
RSpec.describe "an expectation set on nil" do
it "issues a warning with file and line number information" do
expect {
expect(nil).to receive(:foo)
}.to output(a_string_including(
"An expectation of `:foo` was set on `nil`",
"#{__FILE__}:#{__LINE__ - 3}"
)).to_stderr
nil.foo
end
it "issues a warning when the expectation is negative" do
expect {
expect(nil).not_to receive(:foo)
}.to output(a_string_including(
"An expectation of `:foo` was set on `nil`",
"#{__FILE__}:#{__LINE__ - 3}"
)).to_stderr
end
it 'does not issue a warning when expectations are set to be allowed' do
allow_message_expectations_on_nil
expect {
expect(nil).to receive(:foo)
expect(nil).to_not receive(:bar)
}.not_to output.to_stderr
nil.foo
end
context 'configured to allow expectation on nil' do
include_context 'with isolated configuration'
it 'does not issue a warning when expectations are set to be allowed' do
RSpec::Mocks.configuration.allow_message_expectations_on_nil = true
expect {
expect(nil).to receive(:foo)
expect(nil).not_to receive(:bar)
}.not_to output.to_stderr
nil.foo
end
end
context 'configured to disallow expectations on nil' do
include_context 'with isolated configuration'
it "raises an error when expectations on nil are disallowed" do
RSpec::Mocks.configuration.allow_message_expectations_on_nil = false
expect { expect(nil).to receive(:foo) }.to raise_error(RSpec::Mocks::MockExpectationError)
expect { expect(nil).not_to receive(:bar) }.to raise_error(RSpec::Mocks::MockExpectationError)
end
end
it 'does not call #nil? on a double extra times' do
dbl = double
expect(dbl).to receive(:nil?).once.and_return(false)
dbl.nil?
end
end
RSpec.describe "#allow_message_expectations_on_nil" do
include_context "with monkey-patched marshal"
it "does not affect subsequent examples" do
allow_message_expectations_on_nil
RSpec::Mocks.teardown
RSpec::Mocks.setup
expect {
expect(nil).to receive(:foo)
}.to output(a_string_including(
"An expectation of `:foo` was set on `nil`",
"#{__FILE__}:#{__LINE__ - 3}"
)).to_stderr
nil.foo
end
it 'doesnt error when marshalled' do
allow_message_expectations_on_nil
expect(Marshal.dump(nil)).to eq Marshal.dump_without_rspec_mocks(nil)
end
end
end
end
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