On Wed, Mar 5, 2008 at 12:28 PM, Rick DeNatale [email protected]
wrote:
This ability to partially specify the contents of a hash argument
seems to be generally useful, particularly for Rails, and was
wondering if anyone had done this. I don’t think it would be too hard.
And by the way, here’s my sketch of how to do this, just looking not
to reinvent the wheel:
class HashWithAtLeast
def initialize(aHash)
@expected = aHash
end
def ==(other)
@expected.each do |key, value|
return false unless other[key] == value
end
true
end
def to_s
“Hash with at least (@expected.inspect)”
end
end
def hash_with_at_least(hash)
HashWithAtLeast.new(hash)
end
describe HashWithAtLeast do
it “should match the same hash” do
hash_with_at_least(:a => 2).should == {:a => 2}
end
it “should match a hash with an extra key/value” do
hash_with_at_least(:a => 2).should == {:a => 2, :b => 3}
end
it “should not match a hash with a missing key” do
hash_with_at_least(:a => 2).should_not == {:b => 2}
hash_with_at_least(:a => 2, :b => 3).should_not == {:a => 2}
end
it “should not match a hash with the wrong value for a key” do
hash_with_at_least(:a => 2).should_not == {:a => 3}
hash_with_at_least(:a => 2, :b => 3).should_not == {:a => 0, :b =>
3}
end
end
describe HashWithAtLeast, “in a message expectation” do
before(:all) do
@foo = Object.new
end
it “should match exact” do
@foo.should_receive(:bar).with(hash_with_at_least(:a => 2))
@foo.bar(:a => 2)
end
it “should allow extra keys” do
@foo.should_receive(:bar).with(hash_with_at_least(:a => 2))
@foo.bar(:a => 2, :b => 3)
end
end
–
Rick DeNatale
My blog on Ruby
http://talklikeaduck.denhaven2.com/
