shard-spectator/spec/docs/readme_spec.cr

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require "../spec_helper"
private abstract class Interface
abstract def invoke(thing) : String
end
# Type being tested.
private class Driver
def do_something(interface : Interface, thing)
interface.invoke(thing)
end
end
Spectator.describe Driver do
# Define a mock for Interface.
mock Interface
# Define a double that the interface will use.
double(:my_double, foo: 42)
it "does a thing" do
# Create an instance of the mock interface.
interface = mock(Interface)
# Indicate that `#invoke` should return "test" when called.
allow(interface).to receive(:invoke).and_return("test")
# Create an instance of the double.
dbl = double(:my_double)
# Call the mock method.
subject.do_something(interface, dbl)
# Verify everything went okay.
expect(interface).to have_received(:invoke).with(dbl)
end
end