require 'rspec/support/spec/library_wide_checks'

RSpec.describe RSpec::Mocks do
  lib_preamble = [
    # We define minitest constants because rspec/mocks/minitest_integration
    # expects these constants to already be defined.
    "module Minitest; class Assertion; end; module Test; end; end",
    'require "rspec/mocks"',
    # Must be required before other files due to how our autoloads are setup.
    # (Users won't hit this problem because they won't require all the files
    # individually in whatever order the file system returns)
    'require "rspec/mocks/any_instance"'
  ]

  # On 1.9.2 we load securerandom to get around the lack of `BasicObject#__id__.
  # Loading securerandom loads many other stdlibs it depends on. Rather than
  # declaring it (and all the stdlibs it loads) as allowed, it's easier just
  # to prevent the loading of securerandom by faking out `BasicObject#__id__
  lib_preamble.unshift "class BasicObject; def __id__; end; end" if RUBY_VERSION == '1.9.2'

  it_behaves_like 'library wide checks', 'rspec-mocks',
    :preamble_for_lib => lib_preamble,
    :allowed_loaded_feature_regexps => [
      /rbconfig/ # loaded by rspec-support
    ] do

    if RUBY_VERSION == '1.9.2'
      before(:example, :description => /spec files/) do
        pending "Loading psych and syck on 1.9.2 (as our test suite does) triggers warnings"
      end
    end
  end

  describe ".verify" do
    it "delegates to the space" do
      foo = double
      expect(foo).to receive(:bar)
      expect do
        RSpec::Mocks.verify
      end.to fail

      RSpec::Mocks.teardown # so the mocks aren't re-verified after this example
    end
  end

  describe ".teardown" do
    it "resets method stubs" do
      string = "foo"
      allow(string).to receive(:bar)
      RSpec::Mocks.teardown
      expect { string.bar }.to raise_error(NoMethodError)
    end

    it "does not put rspec-mocks into an inconsistent state when called extra times" do
      RSpec::Mocks.teardown
      RSpec::Mocks.teardown
      RSpec::Mocks.teardown

      string = "foo"
      expect { allow(string).to receive(:bar) }.to raise_error(RSpec::Mocks::OutsideOfExampleError)

      RSpec::Mocks.setup
      allow(string).to receive(:bar).and_return(:baz)
      expect(string.bar).to eq(:baz)
    end
  end

  describe ".setup" do
    it 'starts a new space scope that is later removed by .teardown' do
      old_space = RSpec::Mocks.space
      RSpec::Mocks.setup

      new_space = RSpec::Mocks.space
      expect(new_space).not_to equal(old_space)

      RSpec::Mocks.teardown
      expect(RSpec::Mocks.space).to equal(old_space)
    end
  end

  describe ".configuration" do
    it 'returns a memoized configuration instance' do
      expect(RSpec::Mocks.configuration).to be_a(RSpec::Mocks::Configuration)
      expect(RSpec::Mocks.configuration).to be(RSpec::Mocks.configuration)
    end
  end

  describe ".with_temporary_scope" do
    context "in a before(:all) with a stubbed double" do
      before(:all) do
        RSpec::Mocks.with_temporary_scope do
          @calculator = double
          allow(@calculator).to receive(:add) { |a, b| a + b }
          @sum = @calculator.add(3, 4)
        end

        capture_error { @calculator.add(1, 10) }
      end

      it 'allows the stubbed double to be used' do
        expect(@sum).to eq(7)
      end

      it 'does not allow the double to be used in the examples' do
        expect {
          @calculator.add(1, 2)
        }.to raise_error(RSpec::Mocks::ExpiredTestDoubleError)
      end

      it 'does not allow the double to be used after the scope in before(:all)' do
        expect(@error).to be_a(RSpec::Mocks::OutsideOfExampleError)
      end
    end

    context "in a before(:all) with a stubbed const" do
      before(:all) do
        RSpec::Mocks.with_temporary_scope do
          stub_const("ValueX", 3)
          stub_const("ValueY", 4)
          @sum = ValueX + ValueY
        end

        capture_error { ValueX + ValueY }
      end

      it 'allows the stubbed constants to be used' do
        expect(@sum).to eq(7)
      end

      it 'does not allow the stubbed constants to be used in the examples' do
        expect(defined?(ValueX)).to be_falsey
        expect(defined?(ValueY)).to be_falsey
      end

      it 'does not allow the stubbed constants to be used after the scope in before(:all)' do
        expect(@error).to be_a(NameError)
        expect(@error.message).to include("ValueX")
      end
    end

    context "in a before(:all) with a unmet mock expectation" do
      before(:all) do
        capture_error do
          RSpec::Mocks.with_temporary_scope do
            calculator = double
            expect(calculator).to receive(:add)
          end
        end
      end

      it 'fails with a mock expectation error' do
        expect(@error).to be_a(RSpec::Mocks::MockExpectationError)
      end
    end

    context "in a before(:all) with an any_instance stub" do
      before(:all) do
        RSpec::Mocks.with_temporary_scope do
          allow_any_instance_of(String).to receive(:sum_with) { |val, x| val + x }
          @sum = "foo".sum_with("bar")
        end

        capture_error { "you".sum_with("me") }
      end

      it 'allows the stub to be used' do
        expect(@sum).to eq("foobar")
      end

      it 'does not allow the double to be used in the examples' do
        expect {
          "foo".sum_with("baz")
        }.to raise_error(NameError, /sum_with/)
      end

      it 'does not allow the double to be used after the scope in before(:all)' do
        expect(@error).to be_a(NameError)
        expect(@error.message).to include("sum_with")
      end
    end

    it 'tears down even if an error occurs' do
      foo = Object.new

      expect {
        RSpec::Mocks.with_temporary_scope do
          allow(foo).to receive(:bar)
          raise "boom"
        end
      }.to raise_error("boom")

      expect(foo).not_to respond_to(:bar)
    end

    it 'does not verify if an error occurs before the block completes' do
      expect {
        RSpec::Mocks.with_temporary_scope do
          foo   = Object.new
          expect(foo).to receive(:bar)
          raise "boom"
        end
      }.to raise_error("boom") # rather than MockExpectationError
    end

    def capture_error
      yield
    rescue Exception => @error
    end
  end

  context "when there is a `let` declaration that overrides an argument matcher" do
    let(:boolean) { :from_let }

    before do
      expect(RSpec::Mocks::ArgumentMatchers.method_defined?(:boolean)).to be true
    end

    it 'allows the `let` definition to win' do
      expect(boolean).to eq(:from_let)
    end
  end
end
