mirror of
https://github.com/ms-ati/docile
synced 2023-03-27 23:21:52 -04:00
362 lines
9.5 KiB
Ruby
362 lines
9.5 KiB
Ruby
require 'spec_helper'
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require 'singleton'
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describe Docile do
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describe '.dsl_eval' do
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context 'when DSL context object is an Array' do
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let(:array) { [] }
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let!(:result) { execute_dsl_against_array }
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def execute_dsl_against_array
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Docile.dsl_eval(array) do
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push 1
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push 2
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pop
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push 3
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end
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end
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it 'executes the block against the DSL context object' do
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expect(array).to eq([1, 3])
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end
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it 'returns the DSL object after executing block against it' do
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expect(result).to eq(array)
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end
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it "doesn't proxy #__id__" do
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Docile.dsl_eval(array) { expect(__id__).not_to eq(array.__id__) }
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end
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it "raises NoMethodError if the DSL object doesn't implement the method" do
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expect { Docile.dsl_eval(array) { no_such_method } }.to raise_error(NoMethodError)
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end
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end
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Pizza = Struct.new(:cheese, :pepperoni, :bacon, :sauce)
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class PizzaBuilder
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def cheese(v=true); @cheese = v; end
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def pepperoni(v=true); @pepperoni = v; end
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def bacon(v=true); @bacon = v; end
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def sauce(v=nil); @sauce = v; end
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def build
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Pizza.new(!!@cheese, !!@pepperoni, !!@bacon, @sauce)
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end
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end
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context 'when DSL context object is a Builder pattern' do
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let(:builder) { PizzaBuilder.new }
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let(:result) { execute_dsl_against_builder_and_call_build }
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def execute_dsl_against_builder_and_call_build
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@sauce = :extra
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Docile.dsl_eval(builder) do
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bacon
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cheese
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sauce @sauce
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end.build
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end
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it 'returns correctly built object' do
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expect(result).to eq(Pizza.new(true, false, true, :extra))
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end
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end
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class InnerDSL
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def initialize; @b = 'b'; end
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attr_accessor :b
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end
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class OuterDSL
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def initialize; @a = 'a'; end
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attr_accessor :a
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def inner(&block)
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Docile.dsl_eval(InnerDSL.new, &block)
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end
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def inner_with_params(param, &block)
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Docile.dsl_eval(InnerDSL.new, param, :foo, &block)
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end
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end
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def outer(&block)
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Docile.dsl_eval(OuterDSL.new, &block)
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end
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context 'when given parameters for the DSL block' do
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def parameterized(*args, &block)
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Docile.dsl_eval(OuterDSL.new, *args, &block)
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end
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it 'passes parameters to the block' do
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parameterized(1,2,3) do |x,y,z|
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expect(x).to eq(1)
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expect(y).to eq(2)
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expect(z).to eq(3)
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end
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end
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it 'finds parameters before methods' do
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parameterized(1) { |a| expect(a).to eq(1) }
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end
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it 'find outer dsl parameters in inner dsl scope' do
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parameterized(1,2,3) do |a,b,c|
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inner_with_params(c) do |d,e|
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expect(a).to eq(1)
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expect(b).to eq(2)
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expect(c).to eq(3)
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expect(d).to eq(c)
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expect(e).to eq(:foo)
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end
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end
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end
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end
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class DSLWithNoMethod
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def initialize(b); @b = b; end
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attr_accessor :b
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def push_element
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@b.push 1
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end
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end
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context 'when DSL have NoMethod error inside' do
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it 'raise error from nil' do
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Docile.dsl_eval(DSLWithNoMethod.new(nil)) do
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expect { push_element }.to raise_error(NoMethodError, /undefined method `push' (for|on) nil:NilClass/)
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end
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end
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end
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context 'when DSL blocks are nested' do
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context 'method lookup' do
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it 'finds method of outer dsl in outer dsl scope' do
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outer { expect(a).to eq('a') }
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end
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it 'finds method of inner dsl in inner dsl scope' do
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outer { inner { expect(b).to eq('b') } }
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end
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it 'finds method of outer dsl in inner dsl scope' do
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outer { inner { expect(a).to eq('a') } }
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end
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it "finds method of block's context in outer dsl scope" do
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def c; 'c'; end
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outer { expect(c).to eq('c') }
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end
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it "finds method of block's context in inner dsl scope" do
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def c; 'c'; end
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outer { inner { expect(c).to eq('c') } }
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end
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it 'finds method of outer dsl in preference to block context' do
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def a; 'not a'; end
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outer { expect(a).to eq('a') }
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outer { inner { expect(a).to eq('a') } }
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end
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end
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context 'local variable lookup' do
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it 'finds local variable from block context in outer dsl scope' do
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foo = 'foo'
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outer { expect(foo).to eq('foo') }
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end
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it 'finds local variable from block definition in inner dsl scope' do
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bar = 'bar'
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outer { inner { expect(bar).to eq('bar') } }
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end
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end
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context 'instance variable lookup' do
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it 'finds instance variable from block definition in outer dsl scope' do
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@iv1 = 'iv1'; outer { expect(@iv1).to eq('iv1') }
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end
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it "proxies instance variable assignments in block in outer dsl scope back into block's context" do
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@iv1 = 'foo'; outer { @iv1 = 'bar' }; expect(@iv1).to eq('bar')
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end
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it 'finds instance variable from block definition in inner dsl scope' do
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@iv2 = 'iv2'; outer { inner { expect(@iv2).to eq('iv2') } }
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end
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it "proxies instance variable assignments in block in inner dsl scope back into block's context" do
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@iv2 = 'foo'; outer { inner { @iv2 = 'bar' } }; expect(@iv2).to eq('bar')
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end
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end
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end
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context 'when DSL context object is a Dispatch pattern' do
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class DispatchScope
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def params
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{ :a => 1, :b => 2, :c => 3 }
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end
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end
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class MessageDispatch
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include Singleton
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def initialize
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@responders = {}
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end
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def add_responder path, &block
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@responders[path] = block
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end
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def dispatch path, request
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Docile.dsl_eval(DispatchScope.new, request, &@responders[path])
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end
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end
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def respond(path, &block)
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MessageDispatch.instance.add_responder(path, &block)
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end
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def send_request(path, request)
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MessageDispatch.instance.dispatch(path, request)
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end
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it 'dispatches correctly' do
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@first = @second = nil
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respond '/path' do |request|
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@first = request
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end
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respond '/new_bike' do |bike|
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@second = "Got a new #{bike}"
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end
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def x(y) ; "Got a #{y}"; end
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respond '/third' do |third|
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expect(x(third)).to eq('Got a third thing')
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end
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fourth = nil
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respond '/params' do |arg|
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fourth = params[arg]
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end
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send_request '/path', 1
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send_request '/new_bike', 'ten speed'
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send_request '/third', 'third thing'
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send_request '/params', :b
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expect(@first).to eq(1)
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expect(@second).to eq('Got a new ten speed')
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expect(fourth).to eq(2)
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end
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end
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end
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describe '.dsl_eval_with_block_return' do
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let(:array) { [] }
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let!(:result) { execute_dsl_against_array }
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def execute_dsl_against_array
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Docile.dsl_eval_with_block_return(array) do
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push 1
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push 2
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pop
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push 3
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'Return me!'
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end
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end
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it 'executes the block against the DSL context object' do
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expect(array).to eq([1, 3])
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end
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it "returns the block's return value" do
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expect(result).to eq('Return me!')
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end
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end
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describe '.dsl_eval_immutable' do
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context 'when DSL context object is a frozen String' do
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let(:original) { "I'm immutable!".freeze }
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let!(:result) { execute_non_mutating_dsl_against_string }
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def execute_non_mutating_dsl_against_string
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Docile.dsl_eval_immutable(original) do
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reverse
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upcase
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end
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end
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it "doesn't modify the original string" do
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expect(original).to eq("I'm immutable!")
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end
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it 'chains the commands in the block against the DSL context object' do
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expect(result).to eq("!ELBATUMMI M'I")
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end
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end
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context 'when DSL context object is a number' do
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let(:original) { 84.5 }
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let!(:result) { execute_non_mutating_dsl_against_number }
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def execute_non_mutating_dsl_against_number
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Docile.dsl_eval_immutable(original) do
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fdiv(2)
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floor
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end
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end
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it 'chains the commands in the block against the DSL context object' do
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expect(result).to eq(42)
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end
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end
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end
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end
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describe Docile::FallbackContextProxy do
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describe '#instance_variables' do
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subject { create_fcp_and_set_one_instance_variable.instance_variables }
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let(:expected_type_of_names) { type_of_ivar_names_on_this_ruby }
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let(:actual_type_of_names) { subject.first.class }
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let(:excluded) { Docile::FallbackContextProxy::NON_PROXIED_INSTANCE_VARIABLES }
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def create_fcp_and_set_one_instance_variable
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fcp = Docile::FallbackContextProxy.new(nil, nil)
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fcp.instance_variable_set(:@foo, 'foo')
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fcp
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end
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def type_of_ivar_names_on_this_ruby
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@a = 1
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instance_variables.first.class
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end
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it 'returns proxied instance variables' do
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expect(subject.map(&:to_sym)).to include(:@foo)
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end
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it "doesn't return non-proxied instance variables" do
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expect(subject.map(&:to_sym)).not_to include(*excluded)
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end
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it 'preserves the type (String or Symbol) of names on this ruby version' do
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expect(actual_type_of_names).to eq(expected_type_of_names)
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end
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end
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end
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