On Oct 19, 2007, at 12:18 PM, Paul Dlug wrote:
> Is it possible to stub a Kernel method? I'm specifically interested in
> the 'open' method to test some code using open-uri. I've tried:
>
> Kernel.should_receive(:open).with('filename').and_return('data')
>
> However, this doesn't seem to work. Any suggestions would be
> appreciated.
Use Kernel.stub!.
Another option is to use dependency injection, and pass the mock
kernel into your class at initialization (something like the following):
class ClassName
def initialize(arg1, kernel=Kernel)
@kernel = kernel
end
def my_func
@kernel.open("blah")
# do something useful here
end
end
describe ClassName do
before :each do
@mock_kernel = mock(Kernel)
@mock_kernel.stub!(:open).and_return "some text"
end
it "should open the file" do
@obj = ClassName.new("hello", @mock_kernel)
@mock_kernel.should_receive(:open).with("blah").and_return "some
text"
@obj.my_func
end
end
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