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module RSpec
module Expectations
RSpec.describe ExpectationTarget do
context 'when constructed via #expect' do
it 'constructs a new instance targetting the given argument' do
expect(expect(7).target).to eq(7)
end
it 'constructs a new instance targetting the given block' do
block = lambda {}
expect(expect(&block).target).to be(block)
end
it 'raises an ArgumentError when given an argument and a block' do
expect {
expect(7) { }
}.to raise_error(ArgumentError)
end
it 'raises a wrong number of args ArgumentError when given two args' do
expect {
expect(1, 2)
}.to raise_error(ArgumentError, /wrong number of arg/)
end
it 'raises an ArgumentError when given neither an argument nor a block' do
expect {
expect
}.to raise_error(ArgumentError)
end
it 'can be passed nil' do
expect(expect(nil).target).to be_nil
end
it 'passes a valid positive expectation' do
expect(5).to eq(5)
end
it 'passes a valid negative expectation' do
expect(5).not_to eq(4)
end
it 'passes a valid negative expectation with a split infinitive' do
expect(5).to_not eq(4)
end
it 'fails an invalid positive expectation' do
expect {
expect(5).to eq(4)
}.to fail_with(/expected: 4.*got: 5/m)
end
it 'fails an invalid negative expectation' do
message = /expected 5 not to be a kind of Fixnum/
expect {
expect(5).not_to be_a(Fixnum)
}.to fail_with(message)
end
it 'fails an invalid negative expectation with a split infinitive' do
message = /expected 5 not to be a kind of Fixnum/
expect {
expect(5).to_not be_a(Fixnum)
}.to fail_with(message)
end
it 'does not support operator matchers from #to' do
expect {
expect(3).to == 3
}.to raise_error(ArgumentError)
end
it 'does not support operator matchers from #not_to' do
expect {
expect(3).not_to == 4
}.to raise_error(ArgumentError)
end
end
context "when passed a block" do
it 'can be used with a block matcher' do
expect { }.not_to raise_error
end
context 'when passed a value matcher' do
not_a_block_matcher_error = /You must pass an argument rather than a block to use the provided matcher/
it 'raises an error that directs the user to pass an arg rather than a block' do
expect {
expect { }.to be_an(Object)
}.to fail_with(not_a_block_matcher_error)
expect {
expect { }.not_to be_nil
}.to fail_with(not_a_block_matcher_error)
expect {
expect { }.to_not be_nil
}.to fail_with(not_a_block_matcher_error)
end
it 'assumes a custom matcher that does not define `supports_block_expectations?` is not a block matcher (since it is relatively rare)' do
custom_matcher = Module.new do
def self.matches?(value); true; end
def self.description; "foo"; end
end
expect(3).to custom_matcher # to show the custom matcher can be used as a matcher
expect {
expect { 3 }.to custom_matcher
}.to fail_with(not_a_block_matcher_error)
end
def new_non_dsl_matcher(&method_defs)
Module.new do
def self.matches?(object); end
def self.failure_message; end
module_eval(&method_defs)
end
end
it "uses the matcher's `description` in the error message" do
custom_matcher = new_non_dsl_matcher do
def self.supports_block_expectations?; false; end
def self.description; "matcher-description"; end
end
expect {
expect { }.to custom_matcher
}.to fail_with(/\(matcher-description\)/)
end
context 'when the matcher does not define `description` (since it is an optional part of the protocol)' do
it 'uses `inspect` in the error message instead' do
custom_matcher = new_non_dsl_matcher do
def self.supports_block_expectations?; false; end
def self.inspect; "matcher-inspect"; end
end
expect {
expect { }.to custom_matcher
}.to fail_with(/\(matcher-inspect\)/)
end
end
end
end
end
end
end
|
