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