Initial code for StubbedType

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Michael Miller 2022-07-03 13:40:29 -06:00
parent 20c9da75a8
commit cecd2464de
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3 changed files with 103 additions and 0 deletions

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@ -270,6 +270,35 @@ Spectator.describe Spectator::Double do
end end
end end
context "class method stubs" do
Spectator::Double.define(ClassDouble) do
stub def self.foo
:stub
end
stub def self.bar(arg)
arg
end
stub def self.baz
yield
end
end
subject(dbl) { ClassDouble }
let(foo_stub) { Spectator::ValueStub.new(:foo, :override) }
after_each { dbl._spectator_clear_stubs }
it "overrides an existing method" do
expect { dbl._spectator_define_stub(foo_stub) }.to change { dbl.foo }.from(:stub).to(:override)
end
it "doesn't affect other methods" do
expect { dbl._spectator_define_stub(foo_stub) }.to_not change { dbl.bar(42) }
end
end
describe "#_spectator_define_stub" do describe "#_spectator_define_stub" do
subject(dbl) { FooBarDouble.new } subject(dbl) { FooBarDouble.new }
let(stub3) { Spectator::ValueStub.new(:foo, 3) } let(stub3) { Spectator::ValueStub.new(:foo, 3) }

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@ -2,6 +2,7 @@ require "../dsl/reserved"
require "./arguments" require "./arguments"
require "./method_call" require "./method_call"
require "./stub" require "./stub"
require "./stubbed_type"
require "./typed_stub" require "./typed_stub"
module Spectator module Spectator
@ -380,5 +381,12 @@ module Spectator
end end
end end
end end
# Automatically extend `StubbedType` when a type is made stubbable.
macro included
extend StubbedType
private class_getter _spectator_stubs : Array(::Spectator::Stub) = [] of ::Spectator::Stub
end
end end
end end

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@ -0,0 +1,66 @@
require "./method_call"
require "./stub"
module Spectator
# Defines stubbing functionality at the type level (classes and structs).
#
# This module is intended to be extended from when a type includes `Stubbable`.
module StubbedType
private abstract def _spectator_stubs : Array(Stub)
def _spectator_find_stub(call : MethodCall) : Stub?
_spectator_stubs.find &.===(call)
end
def _spectator_stub_for_method?(method : Symbol) : Bool
_spectator_stubs.any? { |stub| stub.method == method }
end
def _spectator_define_stub(stub : Stub) : Nil
_spectator_stubs.unshift(stub)
end
def _spectator_clear_stubs : Nil
_spectator_stubs.clear
end
def _spectator_record_call(call : MethodCall) : Nil
_spectator_calls << call
end
def _spectator_calls
[] of MethodCall
end
def _spectator_stub_fallback(call : MethodCall, &)
Log.trace { "Fallback for #{call} - call original" }
yield
end
def _spectator_stub_fallback(call : MethodCall, type, &)
_spectator_stub_fallback(call) { yield }
end
def _spectator_abstract_stub_fallback(call : MethodCall)
Log.info do
break unless _spectator_stub_for_method?(call.method)
"Stubs are defined for #{call.method.inspect}, but none matched (no argument constraints met)."
end
raise UnexpectedMessage.new("#{_spectator_stubbed_name} received unexpected message #{call}")
end
def _spectator_abstract_stub_fallback(call : MethodCall, type)
_spectator_abstract_stub_fallback(call)
end
def _spectator_stubbed_name : String
{% if anno = @type.annotation(StubbedName) %}
"#<Stubbed " + {{(anno[0] || :Anonymous.id).stringify}} + ">"
{% else %}
"#<Stubbed " + {{@type.name.stringify}} + ">"
{% end %}
end
end
end