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RSpec.describe 'a matcher is expected to be able to have its description generated' do
after(:example) do
RSpec::Matchers.clear_generated_description
end
example "expect(...).to eq expected" do
expect("this").to eq "this"
expect(RSpec::Matchers.generated_description).to eq "is expected to eq \"this\""
end
example "expect(...).to not eq expected" do
expect("this").not_to eq "that"
expect(RSpec::Matchers.generated_description).to eq "is expected not to eq \"that\""
end
example "expect(...).to be empty (arbitrary predicate)" do
expect([]).to be_empty
expect(RSpec::Matchers.generated_description).to eq "is expected to be empty"
end
example "expect(...).to not be empty (arbitrary predicate)" do
expect([1]).not_to be_empty
expect(RSpec::Matchers.generated_description).to eq "is expected not to be empty"
end
example "expect(...).to be truthy" do
expect(true).to be_truthy
expect(RSpec::Matchers.generated_description).to eq "is expected to be truthy"
end
example "expect(...).to be falsey" do
expect(false).to be_falsey
expect(RSpec::Matchers.generated_description).to eq "is expected to be falsey"
end
example "expect(...).to be nil" do
expect(nil).to be_nil
expect(RSpec::Matchers.generated_description).to eq "is expected to be nil"
end
example "expect(...).to be > n" do
expect(5).to be > 3
expect(RSpec::Matchers.generated_description).to eq "is expected to be > 3"
end
example "expect(...).to be between min and max" do
expect(10).to be_between(0, 10)
expect(RSpec::Matchers.generated_description).to eq "is expected to be between 0 and 10 (inclusive)"
end
example "expect(...).to be exclusively between min and max" do
expect(9).to be_between(0, 10).exclusive
expect(RSpec::Matchers.generated_description).to eq "is expected to be between 0 and 10 (exclusive)"
end
example "expect(...).to be predicate arg1, arg2 and arg3" do
class Parent; end
class Child < Parent
def child_of?(*parents)
parents.all? { |parent| is_a?(parent) }
end
end
expect(Child.new).to be_a_child_of(Parent, Object)
expect(RSpec::Matchers.generated_description).to eq "is expected to be a child of Parent and Object"
end
example "expect(...).to equal" do
expected = "expected"
expect(expected).to equal(expected)
expect(RSpec::Matchers.generated_description).to eq "is expected to equal \"expected\""
end
example "expect(...).not_to equal" do
expect(5).not_to equal(37)
expect(RSpec::Matchers.generated_description).to eq "is expected not to equal 37"
end
example "expect(...).to eql" do
expect("string").to eql("string")
expect(RSpec::Matchers.generated_description).to eq "is expected to eql \"string\""
end
example "expect(...).not_to eql" do
expect("a").not_to eql(:a)
expect(RSpec::Matchers.generated_description).to eq "is expected not to eql :a"
end
example "expect(...).to have_key" do
expect({ :a => "a" }).to have_key(:a)
expect(RSpec::Matchers.generated_description).to eq "is expected to have key :a"
end
example "expect(...).to have_some_method" do
object = Object.new
def object.has_eyes_closed?; true; end
expect(object).to have_eyes_closed
expect(RSpec::Matchers.generated_description).to eq 'is expected to have eyes closed'
end
example "expect(...).to have_some_method(args*)" do
object = Object.new
def object.has_taste_for?(*_args); true; end
expect(object).to have_taste_for("wine", "cheese")
expect(RSpec::Matchers.generated_description).to eq 'is expected to have taste for "wine" and "cheese"'
end
example "expect(...).to include(x)" do
expect([1, 2, 3]).to include(3)
expect(RSpec::Matchers.generated_description).to eq "is expected to include 3"
end
example "expect(...).to include(x) when x responds to description but is not a matcher" do
obj = double(:description => "description", :inspect => "inspect")
expect([obj]).to include(obj)
expect(RSpec::Matchers.generated_description).to eq "is expected to include inspect"
end
example "expect(...).to include(x) when x responds to description and is a matcher" do
matcher = double(:description => "description",
:matches? => true,
:failure_message => "")
expect([matcher]).to include(matcher)
expect(RSpec::Matchers.generated_description).to eq "is expected to include (description)"
end
example "expect(array).to contain_exactly(1, 2, 3)" do
expect([1, 2, 3]).to contain_exactly(1, 2, 3)
expect(RSpec::Matchers.generated_description).to eq "is expected to contain exactly 1, 2, and 3"
end
example "expect(...).to match" do
expect("this string").to match(/this string/)
expect(RSpec::Matchers.generated_description).to eq "is expected to match /this string/"
end
example "expect(...).to raise_error" do
expect { raise 'foo' }.to raise_error Exception
expect(RSpec::Matchers.generated_description).to eq "is expected to raise Exception"
end
example "expect(...).to raise_error with class" do
expect { raise }.to raise_error(RuntimeError)
expect(RSpec::Matchers.generated_description).to eq "is expected to raise RuntimeError"
end
example "expect(...).to raise_error with class and message" do
expect { raise "there was an error" }.to raise_error(RuntimeError, "there was an error")
expect(RSpec::Matchers.generated_description).to eq "is expected to raise RuntimeError with \"there was an error\""
end
example "expect(...).to respond_to" do
expect([]).to respond_to(:insert)
expect(RSpec::Matchers.generated_description).to eq "is expected to respond to #insert"
end
example "expect(...).to throw symbol" do
expect { throw :what_a_mess }.to throw_symbol
expect(RSpec::Matchers.generated_description).to eq "is expected to throw a Symbol"
end
example "expect(...).to throw symbol (with named symbol)" do
expect { throw :what_a_mess }.to throw_symbol(:what_a_mess)
expect(RSpec::Matchers.generated_description).to eq "is expected to throw :what_a_mess"
end
example "expect(...).to matcher_that_delegates_to_an_internal_expectation" do
expect(1).to matcher_that_delegates_to_an_internal_expectation
expect(RSpec::Matchers.generated_description).to eq "is expected to matcher that delegates to an internal expectation"
end
example "expect(...).not_to matcher_that_delegates_to_an_internal_expectation" do
expect(1).not_to matcher_that_delegates_to_an_internal_expectation
expect(RSpec::Matchers.generated_description).to eq "is expected not to matcher that delegates to an internal expectation"
end
RSpec::Matchers.define :matcher_that_delegates_to_an_internal_expectation do
match { expect(1).to eq(1) }
match_when_negated { expect(1).to eq(1) }
end
end
RSpec.describe "a Matcher with no description" do
it "provides a helpful message when used in a string-less example block" do
matcher = Class.new do
def matches?(_ignore); true; end
def failure_message; ""; end
end.new
expect(5).to matcher
expect(RSpec::Matchers.generated_description).to match(/When you call.*description method/m)
end
end
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