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require 'spec_helper'
describe "Spy" do
class Foo
def method_that_accepts_a_block(&block)
end
end
let(:obj) { Foo.new }
describe "#and_yield" do
context "with eval context as block argument" do
it "evaluates the supplied block as it is read" do
evaluated = false
Spy.on(obj, :method_that_accepts_a_block).and_yield do |eval_context|
evaluated = true
end
expect(evaluated).to be_true
end
it "passes an eval context object to the supplied block" do
Spy.on(obj, :method_that_accepts_a_block).and_yield do |eval_context|
expect(eval_context).not_to be_nil
end
end
it "evaluates the block passed to the stubbed method in the context of the supplied eval context" do
expected_eval_context = nil
actual_eval_context = nil
Spy.on(obj, :method_that_accepts_a_block).and_yield do |eval_context|
expected_eval_context = eval_context
end
obj.method_that_accepts_a_block do
actual_eval_context = self
end
expect(actual_eval_context).to equal(expected_eval_context)
end
context "and no yielded arguments" do
it "passes when expectations set on the eval context are met" do
configured_eval_context = nil
context_foo_spy = nil
Spy.on(obj, :method_that_accepts_a_block).and_yield do |eval_context|
configured_eval_context = eval_context
context_foo_spy = Spy::Subroutine.new(configured_eval_context, :foo).hook(force: true)
end
obj.method_that_accepts_a_block do
foo
end
expect(context_foo_spy).to have_been_called
end
it "fails when expectations set on the eval context are not met" do
configured_eval_context = nil
context_foo_spy = nil
Spy.on(obj, :method_that_accepts_a_block).and_yield do |eval_context|
configured_eval_context = eval_context
context_foo_spy = Spy::Subroutine.new(configured_eval_context, :foo).hook(force: true)
end
obj.method_that_accepts_a_block do
# foo is not called here
end
expect(context_foo_spy).to_not have_been_called
end
end
context "and yielded arguments" do
it "passes when expectations set on the eval context and yielded arguments are met" do
configured_eval_context = nil
yielded_arg = Object.new
context_foo_spy = nil
Spy.on(obj, :method_that_accepts_a_block).and_yield(yielded_arg) do |eval_context|
configured_eval_context = eval_context
context_foo_spy = Spy::Subroutine.new(configured_eval_context, :foo).hook(force: true)
Spy::Subroutine.new(yielded_arg, :bar).hook(force: true)
end
obj.method_that_accepts_a_block do |obj|
obj.bar
foo
end
expect(context_foo_spy).to have_been_called
expect(Spy.get(yielded_arg, :bar)).to have_been_called
end
it "fails when expectations set on the eval context and yielded arguments are not met" do
configured_eval_context = nil
yielded_arg = Object.new
context_foo_spy = nil
Spy.on(obj, :method_that_accepts_a_block).and_yield(yielded_arg) do |eval_context|
configured_eval_context = eval_context
context_foo_spy = Spy::Subroutine.new(configured_eval_context, :foo).hook(force: true)
Spy::Subroutine.new(yielded_arg, :bar).hook(force: true)
end
obj.method_that_accepts_a_block do |obj|
# obj.bar is not called here
# foo is not called here
end
expect(context_foo_spy).to_not have_been_called
expect(Spy.get(yielded_arg, :bar)).to_not have_been_called
end
end
end
end
end
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