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require 'spec_helper'
require 'mspec/expectations/expectations'
require 'mspec/matchers'
shared_examples_for "have_instance_variable, on all Ruby versions" do
after :all do
Object.const_set :RUBY_VERSION, @ruby_version
end
it "matches when object has the instance variable, given as string" do
matcher = HaveInstanceVariableMatcher.new('@foo')
matcher.matches?(@object).should be_true
end
it "matches when object has the instance variable, given as symbol" do
matcher = HaveInstanceVariableMatcher.new(:@foo)
matcher.matches?(@object).should be_true
end
it "does not match when object hasn't got the instance variable, given as string" do
matcher = HaveInstanceVariableMatcher.new('@bar')
matcher.matches?(@object).should be_false
end
it "does not match when object hasn't got the instance variable, given as symbol" do
matcher = HaveInstanceVariableMatcher.new(:@bar)
matcher.matches?(@object).should be_false
end
it "provides a failure message for #should" do
matcher = HaveInstanceVariableMatcher.new(:@bar)
matcher.matches?(@object)
matcher.failure_message.should == [
"Expected #{@object.inspect} to have instance variable '@bar'",
"but it does not"
]
end
it "provides a failure messoge for #should_not" do
matcher = HaveInstanceVariableMatcher.new(:@bar)
matcher.matches?(@object)
matcher.negative_failure_message.should == [
"Expected #{@object.inspect} NOT to have instance variable '@bar'",
"but it does"
]
end
end
describe HaveInstanceVariableMatcher, "on RUBY_VERSION >= 1.9" do
before :all do
@ruby_version = Object.const_get :RUBY_VERSION
Object.const_set :RUBY_VERSION, '1.9.0'
@object = Object.new
def @object.instance_variables
[:@foo]
end
end
it_should_behave_like "have_instance_variable, on all Ruby versions"
end
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