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has_spec.rb
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has_spec.rb
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RSpec.describe "expect(...).to have_sym(*args)" do
it_behaves_like "an RSpec matcher", :valid_value => { :a => 1 },
:invalid_value => {} do
let(:matcher) { have_key(:a) }
end
it "passes if #has_sym?(*args) returns true" do
expect({ :a => "A" }).to have_key(:a)
end
if RSpec::Support::RubyFeatures.required_kw_args_supported?
binding.eval(<<-CODE, __FILE__, __LINE__)
it 'supports the use of required keyword arguments' do
thing = Class.new { def has_keyword?(keyword:); keyword == 'a'; end }
expect(thing.new).to have_keyword(keyword: 'a')
end
CODE
end
if RSpec::Support::RubyFeatures.kw_args_supported?
binding.eval(<<-CODE, __FILE__, __LINE__)
it 'supports the use of optional keyword arguments' do
thing = Class.new { def has_keyword?(keyword: 'b'); keyword == 'a'; end }
expect(thing.new).to have_keyword(keyword: 'a')
end
CODE
end
it "fails if #has_sym?(*args) returns false" do
expect {
expect({ :b => "B" }).to have_key(:a)
}.to fail_with('expected `{:b=>"B"}.has_key?(:a)` to return true, got false')
end
obj_with_block_method = Object.new
def obj_with_block_method.has_some_stuff?; yield; end
it 'forwards the given `{ }` block on to the `has_xyz?` method' do
expect(obj_with_block_method).to have_some_stuff { true }
expect(obj_with_block_method).to_not have_some_stuff { false }
end
it 'forwards the given `do..end` block on to the `has_xyz?` method' do
expect(obj_with_block_method).to have_some_stuff do
true
end
expect(obj_with_block_method).to_not have_some_stuff do
false
end
end
it 'favors a curly brace block over a do...end one since it binds to the matcher method' do
expect(obj_with_block_method).to have_some_stuff { true } do
false
end
expect(obj_with_block_method).not_to have_some_stuff { false } do
true
end
end
it 'does not include any args in the failure message if no args were given to the matcher' do
o = Object.new
def o.has_some_stuff?; false; end
expect {
expect(o).to have_some_stuff
}.to fail_with("expected `#{o.inspect}.has_some_stuff?` to return true, got false")
end
it 'includes multiple args in the failure message if multiple args were given to the matcher' do
o = Object.new
def o.has_some_stuff?(*_); false; end
expect {
expect(o).to have_some_stuff(:a, 7, "foo")
}.to fail_with(%Q{expected `#{o.inspect}.has_some_stuff?(:a, 7, "foo")` to return true, got false})
end
it "fails if #has_sym?(*args) returns nil" do
klass = Class.new do
def has_foo?
end
end
expect {
expect(klass.new).to have_foo
}.to fail_with(/expected `.*\.has_foo\?` to return true, got nil/)
end
it 'fails if #has_sym?(*args) is private' do
klass = Class.new do
private
def has_foo?
true
end
end
expect { expect(klass.new).to have_foo }.to fail_with(/private/)
end
it "fails if target does not respond to #has_sym?" do
expect {
expect(Object.new).to have_key(:a)
}.to fail_including('to respond to `has_key?`')
end
it "reraises an exception thrown in #has_sym?(*args)" do
o = Object.new
def o.has_sym?(*_args)
raise "Funky exception"
end
expect {
expect(o).to have_sym(:foo)
}.to raise_error("Funky exception")
end
it 'allows composable aliases to be defined' do
RSpec::Matchers.alias_matcher :an_object_having_sym, :have_sym
o = Object.new
def o.has_sym?(sym); sym == :foo; end
expect(o).to an_object_having_sym(:foo)
expect(o).not_to an_object_having_sym(:bar)
expect(an_object_having_sym(:foo).description).to eq("an object having sym :foo")
end
it 'composes gracefully' do
RSpec::Matchers.alias_matcher :an_object_having_foo, :have_foo
expect([
double,
double(:has_foo? => false),
double(:has_foo? => true),
]).to include an_object_having_foo
end
end
RSpec.describe "expect(...).not_to have_sym(*args)" do
it "passes if #has_sym?(*args) returns false" do
expect({ :a => "A" }).not_to have_key(:b)
end
context "when strict_predicate_matchers is set to true" do
it "fails when #has_sym? returns nil" do
actual = double("actual", :has_foo? => nil)
expect {
expect(actual).not_to have_foo
}.to fail_with("expected `#{actual.inspect}.has_foo?` to return false, got nil")
end
end
context "when strict_predicate_matchers is set to false" do
around do |example|
RSpec::Expectations.configuration.strict_predicate_matchers = false
example.run
RSpec::Expectations.configuration.strict_predicate_matchers = true
end
it "passes if #has_sym?(*args) returns nil" do
actual = double("actual", :has_foo? => nil)
expect(actual).not_to have_foo
end
end
it "fails if #has_sym?(*args) returns true" do
expect {
expect({ :a => "A" }).not_to have_key(:a)
}.to fail_with('expected `{:a=>"A"}.has_key?(:a)` to return false, got true')
end
it "fails if target does not respond to #has_sym?" do
expect {
expect(Object.new).not_to have_key(:a)
}.to fail_including('to respond to `has_key?`')
end
it "reraises an exception thrown in #has_sym?(*args)" do
o = Object.new
def o.has_sym?(*_args)
raise "Funky exception"
end
expect {
expect(o).not_to have_sym(:foo)
}.to raise_error("Funky exception")
end
it 'does not include any args in the failure message if no args were given to the matcher' do
o = Object.new
def o.has_some_stuff?; true; end
expect {
expect(o).not_to have_some_stuff
}.to fail_with("expected `#{o.inspect}.has_some_stuff?` to return false, got true")
end
it 'includes multiple args in the failure message if multiple args were given to the matcher' do
o = Object.new
def o.has_some_stuff?(*_); true; end
expect {
expect(o).not_to have_some_stuff(:a, 7, "foo")
}.to fail_with(%Q{expected `#{o.inspect}.has_some_stuff?(:a, 7, "foo")` to return false, got true})
end
end
RSpec.describe "has" do
it "works when the target implements #send" do
o = { :a => "A" }
def o.send(*_args); raise "DOH! Library developers shouldn't use #send!" end
expect {
expect(o).to have_key(:a)
}.not_to raise_error
end
end