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require 'rspec/matchers/fail_matchers'
require 'support/doubled_classes'
RSpec.describe "Test doubles format well in failure messages" do
include RSpec::Matchers::FailMatchers
include RSpec::Support::Spec::DiffHelpers
RSpec::Matchers.define :format_in_failures_as do |expected|
match do |dbl|
values_match?(expected, actual_formatting(dbl))
end
def actual_formatting(double)
expect(1).to eq(double)
rescue RSpec::Expectations::ExpectationNotMetError => e
e.message[/expected: (.*)$/, 1]
else
raise "Did not fail as expected"
end
end
describe "`double`" do
context "with a name" do
specify '#<Double "Name">' do
expect(double "Book").to format_in_failures_as('#<Double "Book">')
end
it 'formats the name as a symbol if that was how it was provided' do
expect(double :book).to format_in_failures_as('#<Double :book>')
end
end
context "without a name" do
specify '#<Double (anonymous)>' do
expect(double).to format_in_failures_as('#<Double (anonymous)>')
end
end
it 'avoids sending `instance_variable_get` to the double as it may be stubbed' do
dbl = double("Book")
expect(dbl).not_to receive(:instance_variable_get)
expect(dbl).to format_in_failures_as('#<Double "Book">')
end
end
describe "`instance_double(SomeClass)`" do
context "with a name" do
specify '#<InstanceDouble(SomeClass) "Name">' do
expect(instance_double(LoadedClass, "Book")).to format_in_failures_as('#<InstanceDouble(LoadedClass) "Book">')
end
end
context "without a name" do
specify '#<InstanceDouble(SomeClass) (anonymous)>' do
expect(instance_double(LoadedClass)).to format_in_failures_as('#<InstanceDouble(LoadedClass) (anonymous)>')
end
end
it 'avoids sending `instance_variable_get` to the double as it may be stubbed' do
dbl = instance_double(LoadedClass, "Book")
expect(dbl).not_to receive(:instance_variable_get)
expect(dbl).to format_in_failures_as('#<InstanceDouble(LoadedClass) "Book">')
end
end
describe "`class_double(SomeClass)`" do
context "with a name" do
specify '#<ClassDouble(SomeClass) "Name">' do
expect(class_double(LoadedClass, "Book")).to format_in_failures_as('#<ClassDouble(LoadedClass) "Book">')
end
end
context "without a name" do
specify '#<ClassDouble(SomeClass) (anonymous)>' do
expect(class_double(LoadedClass)).to format_in_failures_as('#<ClassDouble(LoadedClass) (anonymous)>')
end
end
end
describe "`object_double([])`" do
context "with a name" do
specify '#<ObjectDouble([]) "Name">' do
expect(object_double([], "Name")).to format_in_failures_as('#<ObjectDouble([]) "Name">')
end
end
context "without a name" do
specify '#<ObjectDouble([]) (anonymous)>' do
expect(object_double([])).to format_in_failures_as('#<ObjectDouble([]) (anonymous)>')
end
end
end
it 'formats the doubles when they appear in data structures and diffs' do
allow(RSpec::Expectations.configuration).to receive(:color?).and_return(false)
foo = double("Foo")
bar = double("Bar")
expect {
expect([foo]).to include(bar)
}.to fail_with(<<-EOS.gsub(/^\s+\|/, ''))
|expected [#<Double "Foo">] to include #<Double "Bar">
|Diff:
|@@ #{one_line_header} @@
|-[#<Double "Bar">]
|+[#<Double "Foo">]
EOS
end
end
|
