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# frozen_string_literal: true
require "values"
RSpec.describe MemoWise do
describe "#memo_wise" do
shared_examples "#memo_wise shared examples" do
#
# These examples depend on `let(:target)` -- can be an instance or a class
#
it "memoizes methods with no arguments" do
expect(Array.new(4) { target.no_args }).to all eq("no_args")
expect(target.no_args_counter).to eq(1)
end
it "memoizes methods with one positional argument" do
expect(Array.new(4) { target.with_one_positional_arg(1) }).to all eq("with_one_positional_arg: a=1")
expect(Array.new(4) { target.with_one_positional_arg(2) }).to all eq("with_one_positional_arg: a=2")
# This should be executed once for each set of arguments passed
expect(target.with_one_positional_arg_counter).to eq(2)
end
it "memoizes methods with positional arguments" do
expect(Array.new(4) { target.with_positional_args(1, 2) }).to all eq("with_positional_args: a=1, b=2")
expect(Array.new(4) { target.with_positional_args(1, 3) }).to all eq("with_positional_args: a=1, b=3")
# This should be executed once for each set of arguments passed
expect(target.with_positional_args_counter).to eq(2)
end
it "memoizes methods with positional and splat arguments" do
expect(Array.new(4) { target.with_positional_and_splat_args(1, 2, 3) }).
to all eq("with_positional_and_splat_args: a=1, args=[2, 3]")
expect(Array.new(4) { target.with_positional_and_splat_args(1, 3, 4) }).
to all eq("with_positional_and_splat_args: a=1, args=[3, 4]")
# This should be executed once for each set of arguments passed
expect(target.with_positional_and_splat_args_counter).to eq(2)
end
it "memoizes methods with one keyword argument" do
expect(Array.new(4) { target.with_one_keyword_arg(a: 1) }).to all eq("with_one_keyword_arg: a=1")
expect(Array.new(4) { target.with_one_keyword_arg(a: 2) }).to all eq("with_one_keyword_arg: a=2")
# This should be executed once for each set of arguments passed
expect(target.with_one_keyword_arg_counter).to eq(2)
end
it "memoizes methods with keyword arguments" do
expect(Array.new(4) { target.with_keyword_args(a: 1, b: 2) }).to all eq("with_keyword_args: a=1, b=2")
expect(Array.new(4) { target.with_keyword_args(a: 2, b: 3) }).to all eq("with_keyword_args: a=2, b=3")
# This should be executed once for each set of arguments passed
expect(target.with_keyword_args_counter).to eq(2)
end
it "memoizes methods with keyword and double-splat arguments" do
expect(Array.new(4) { target.with_keyword_and_double_splat_args(a: 1, b: 2, c: 3) }).
to all eq("with_keyword_and_double_splat_args: a=1, kwargs={:b=>2, :c=>3}")
expect(Array.new(4) { target.with_keyword_and_double_splat_args(a: 1, b: 2, c: 4) }).
to all eq("with_keyword_and_double_splat_args: a=1, kwargs={:b=>2, :c=>4}")
# This should be executed once for each set of arguments passed
expect(target.with_keyword_and_double_splat_args_counter).to eq(2)
end
it "memoizes methods with positional and keyword arguments" do
expect(Array.new(4) { target.with_positional_and_keyword_args(1, b: 2) }).
to all eq("with_positional_and_keyword_args: a=1, b=2")
expect(Array.new(4) { target.with_positional_and_keyword_args(2, b: 3) }).
to all eq("with_positional_and_keyword_args: a=2, b=3")
# This should be executed once for each set of arguments passed
expect(target.with_positional_and_keyword_args_counter).to eq(2)
end
it "memoizes methods with positional, splat, keyword, and double-splat arguments" do
expect(Array.new(4) { target.with_positional_splat_keyword_and_double_splat_args(1, 2, 3, b: 4, c: 5, d: 6) }).
to all eq("with_positional_splat_keyword_and_double_splat_args: a=1, args=[2, 3] b=4 kwargs={:c=>5, :d=>6}")
expect(Array.new(4) { target.with_positional_splat_keyword_and_double_splat_args(1, 2, b: 4, c: 5) }).
to all eq("with_positional_splat_keyword_and_double_splat_args: a=1, args=[2] b=4 kwargs={:c=>5}")
# This should be executed once for each set of arguments passed
expect(target.with_positional_splat_keyword_and_double_splat_args_counter).to eq(2)
end
it "memoizes methods with special characters in the name" do
expect(Array.new(4) { target.special_chars? }).to all eq("special_chars?")
expect(target.special_chars_counter).to eq(1)
end
it "memoizes methods set to false values" do
expect(Array.new(4) { target.false_method }).to all eq(false)
expect(target.false_method_counter).to eq(1)
end
it "memoizes methods set to nil values" do
expect(Array.new(4) { target.nil_method }).to all eq(nil)
expect(target.nil_method_counter).to eq(1)
end
context "with private methods" do
it "keeps private methods private" do
expect(target.private_methods).to include(:private_memowise_method)
end
it "memoizes private methods" do
expect(Array.new(4) { target.send(:private_memowise_method) }).to all eq("private_memowise_method")
expect(target.private_memowise_method_counter).to eq(1)
end
end
context "with public methods" do
it "keeps public methods public" do
expect(target.public_methods).to include(:public_memowise_method)
end
it "memoizes public methods" do
expect(Array.new(4) { target.public_memowise_method }).to all eq("public_memowise_method")
expect(target.public_memowise_method_counter).to eq(1)
end
end
it "memoizes methods with proc arguments" do
proc_param = proc { true }
expect(Array.new(4) { target.proc_method(proc_param) }).to all eq(true)
expect(target.proc_method_counter).to eq(1)
end
it "will not memoize methods with implicit block arguments" do
expect { target.implicit_block_method }.to raise_error(LocalJumpError)
end
it "will not memoize methods with explicit block arguments" do
expect { target.explicit_block_method { nil } }.to raise_error(LocalJumpError)
end
end
shared_examples "handles memoized/non-memoized methods with the same name at different "\
"scopes" do
context "with non-memoized method with same name as memoized method" do
context "when methods have no arguments" do
it "does not memoize the non-memoized method" do
# Confirm the memoized method works correctly first.
expect(Array.new(4) { memoized.no_args }).to all eq("no_args")
expect(memoized.no_args_counter).to eq(1)
# Now confirm our non-memoized method is not memoized.
expect(Array.new(4) { non_memoized.no_args }).to all eq("#{non_memoized_name}_no_args")
expect(non_memoized.send("#{non_memoized_name}_no_args_counter")).to eq(4)
end
end
context "when methods have one positional argument" do
it "does not memoize the non-memoized method" do
# Confirm the memoized method works correctly first.
expect(Array.new(4) { memoized.with_one_positional_arg(1) }).to all eq("with_one_positional_arg: a=1")
expect(memoized.with_one_positional_arg_counter).to eq(1)
# Now confirm our non-memoized method is not memoized.
expect(Array.new(4) { non_memoized.with_one_positional_arg(1) }).
to all eq("#{non_memoized_name}_with_one_positional_arg: a=1")
expect(non_memoized.send("#{non_memoized_name}_one_positional_arg_counter")).to eq(4)
end
end
context "when methods have multiple positional arguments" do
it "does not memoize the non-memoized method" do
# Confirm the memoized method works correctly first.
expect(Array.new(4) { memoized.with_positional_args(1, 2) }).to all eq("with_positional_args: a=1, b=2")
expect(memoized.with_positional_args_counter).to eq(1)
# Now confirm our non-memoized method is not memoized.
expect(Array.new(4) { non_memoized.with_positional_args(1, 2) }).
to all eq("#{non_memoized_name}_with_positional_args: a=1, b=2")
expect(non_memoized.send("#{non_memoized_name}_positional_args_counter")).to eq(4)
end
end
end
end
context "with instance methods" do
include_context "with context for instance methods"
# Use the instance as the target of "#memo_wise shared examples"
let(:target) { instance }
it_behaves_like "#memo_wise shared examples"
it "does not memoize methods across instances" do
instance2 = class_with_memo.new
instance.no_args
expect(instance.no_args_counter).to eq(1)
expect(instance2.no_args_counter).to eq(0)
end
context "with protected methods" do
it "keeps protected methods protected" do
expect(target.protected_methods).to include(:protected_memowise_method)
end
it "memoizes protected methods" do
expect(Array.new(4) { target.send(:protected_memowise_method) }).to all eq("protected_memowise_method")
expect(target.protected_memowise_method_counter).to eq(1)
end
end
context "when memo_wise has *not* been called on a *class* method" do
it "does *not* create class-level instance variable" do
expect(class_with_memo.instance_variables).not_to include(:@_memo_wise)
end
end
# This test nondeterministically fails in JRuby with the following error:
# NoMethodError:
# super: no superclass method `allocate' for #<Class:0xacc6a69>
unless RUBY_PLATFORM == "java"
context "when instances are created with Class#allocate" do
let(:instance) { class_with_memo.allocate }
it "memoizes correctly" do
expect(Array.new(4) { instance.no_args }).to all eq("no_args")
expect(instance.no_args_counter).to eq(1)
end
end
end
context "when the name of the method to memoize is not a symbol" do
let(:class_with_memo) do
super().tap { |klass| klass.memo_wise "no_args" }
end
it { expect { instance }.to raise_error(ArgumentError) }
end
it_behaves_like "handles memoized/non-memoized methods with the same name at different scopes" do
let(:memoized) { instance }
let(:non_memoized) { class_with_memo }
let(:non_memoized_name) { :class }
end
context "when the class is a Value class using the 'values' gem" do
let(:external_counter) { [0] }
let(:increment_proc) { -> { external_counter[0] += 1 } }
let(:value_class) do
Value.new(:increment_proc) do
prepend MemoWise # rubocop:disable RSpec/DescribedClass
def no_args
increment_proc.call
"no_args"
end
memo_wise :no_args
end
end
let(:value_instance) { value_class.new(increment_proc) }
it "memoizes methods" do
expect(Array.new(4) { value_instance.no_args }).to all eq("no_args")
expect(external_counter[0]).to eq(1)
end
end
context "when the class has a child class" do
let(:child_class) do
Class.new(class_with_memo) do
def child_method_counter
@child_method_counter || 0
end
def child_method
@child_method_counter = child_method_counter + 1
"child_method"
end
end
end
let(:instance) { child_class.new }
it "memoizes the parent methods" do
expect(Array.new(4) { instance.no_args }).to all eq("no_args")
expect(instance.no_args_counter).to eq(1)
expect(Array.new(4) { instance.child_method }).to all eq("child_method")
expect(instance.child_method_counter).to eq(4)
end
context "when the child class also memoizes methods" do
before :each do
child_class.prepend described_class
child_class.memo_wise :child_method
end
it "memoizes the parent and child methods separately" do
expect(Array.new(4) { instance.no_args }).to all eq("no_args")
expect(instance.no_args_counter).to eq(1)
expect(Array.new(4) { instance.child_method }).to all eq("child_method")
expect(instance.child_method_counter).to eq(1)
end
end
end
context "when the class inherits memoization from multiple modules" do
let(:module1) do
Module.new do
prepend MemoWise
def module1_method_counter
@module1_method_counter || 0 # rubocop:disable RSpec/InstanceVariable
end
def module1_method
@module1_method_counter = module1_method_counter + 1
"module1_method"
end
memo_wise :module1_method
end
end
let(:module2) do
Module.new do
prepend MemoWise
def module2_method_counter
@module2_method_counter || 0 # rubocop:disable RSpec/InstanceVariable
end
def module2_method
@module2_method_counter = module2_method_counter + 1
"module2_method"
end
memo_wise :module2_method
end
end
let(:klass) do
Class.new do
include Module1, Module2
end
end
let(:instance) { klass.new }
before(:each) do
stub_const("Module1", module1)
stub_const("Module2", module2)
end
it "memoizes inherited methods separately" do
expect(Array.new(4) { instance.module1_method }).to all eq("module1_method")
expect(instance.module1_method_counter).to eq(1)
expect(Array.new(4) { instance.module2_method }).to all eq("module2_method")
expect(instance.module2_method_counter).to eq(1)
end
end
context "when the class, its superclass, and its module all memoize methods" do
let(:parent_class) do
Class.new do
prepend MemoWise
def parent_class_method_counter
@parent_class_method_counter || 0
end
def parent_class_method
@parent_class_method_counter = parent_class_method_counter + 1
"parent_class_method"
end
memo_wise :parent_class_method
end
end
let(:module1) do
Module.new do
prepend MemoWise
def module1_method_counter
@module1_method_counter || 0 # rubocop:disable RSpec/InstanceVariable
end
def module1_method
@module1_method_counter = module1_method_counter + 1
"module1_method"
end
memo_wise :module1_method
end
end
let(:child_class) do
Class.new(parent_class) do
include Module1
def child_class_method_counter
@child_class_method_counter || 0
end
def child_class_method
@child_class_method_counter = child_class_method_counter + 1
"child_class_method"
end
memo_wise :child_class_method
end
end
let(:instance) { child_class.new }
before(:each) do
stub_const("Module1", module1)
end
it "memoizes inherited methods separately" do
expect(Array.new(4) { instance.parent_class_method }).to all eq("parent_class_method")
expect(instance.parent_class_method_counter).to eq(1)
expect(Array.new(4) { instance.module1_method }).to all eq("module1_method")
expect(instance.module1_method_counter).to eq(1)
expect(Array.new(4) { instance.child_class_method }).to all eq("child_class_method")
expect(instance.child_class_method_counter).to eq(1)
end
end
end
# These test cases would fail due to a JRuby bug
# Skipping to make build pass until the bug is fixed
# https://github.com/jruby/jruby/issues/6896
unless RUBY_PLATFORM == "java"
context "with class methods" do
context "when defined with 'def self.'" do
include_context "with context for class methods via 'def self.'"
# Use the class as the target of "#memo_wise shared examples"
let(:target) { class_with_memo }
it_behaves_like "#memo_wise shared examples"
it "creates a class-level instance variable" do
# NOTE: test implementation detail to ensure the inverse test is valid
expect(class_with_memo.instance_variables).to include(:@_memo_wise)
end
it_behaves_like "handles memoized/non-memoized methods with the same name at different scopes" do
let(:memoized) { class_with_memo }
let(:non_memoized) { class_with_memo.new }
let(:non_memoized_name) { :instance }
end
context "when an invalid hash key is passed to .memo_wise" do
let(:class_with_memo) do
Class.new do
prepend MemoWise
def self.class_method; end
end
end
it "raises an error when passing a key which is not `self:`" do
expect { class_with_memo.send(:memo_wise, bad_key: :class_method) }.
to raise_error(ArgumentError, "`:self` is the only key allowed in memo_wise")
end
end
context "when the class has a child class" do
let(:child_class) do
Class.new(class_with_memo) do
def self.child_method_counter
@child_method_counter || 0
end
def self.child_method
@child_method_counter = child_method_counter + 1
"child_method"
end
end
end
it "memoizes the parent methods" do
expect(Array.new(4) { child_class.no_args }).to all eq("no_args")
expect(child_class.no_args_counter).to eq(1)
expect(Array.new(4) { child_class.child_method }).to all eq("child_method")
expect(child_class.child_method_counter).to eq(4)
end
context "when the child class also memoizes methods" do
before :each do
child_class.prepend described_class
child_class.memo_wise self: :child_method
end
it "memoizes the parent and child methods separately" do
expect(Array.new(4) { child_class.no_args }).to all eq("no_args")
expect(child_class.no_args_counter).to eq(1)
expect(Array.new(4) { child_class.child_method }).to all eq("child_method")
expect(child_class.child_method_counter).to eq(1)
end
end
end
end
context "when defined with scope 'class << self'" do
include_context "with context for class methods via scope 'class << self'"
# Use the class as the target of "#memo_wise shared examples"
let(:target) { class_with_memo }
it_behaves_like "#memo_wise shared examples"
it "creates a class-level instance variable" do
# NOTE: this test ensure the inverse test above continues to be valid
expect(class_with_memo.instance_variables).to include(:@_memo_wise)
end
it_behaves_like "handles memoized/non-memoized methods with the same name at different scopes" do
let(:memoized) { class_with_memo }
let(:non_memoized) { class_with_memo.new }
let(:non_memoized_name) { :instance }
end
context "when the class has a child class" do
let(:child_class) do
Class.new(class_with_memo) do
class << self
def child_method_counter
@child_method_counter || 0
end
def child_method
@child_method_counter = child_method_counter + 1
"child_method"
end
end
end
end
it "memoizes the parent methods" do
expect(Array.new(4) { child_class.no_args }).to all eq("no_args")
expect(child_class.no_args_counter).to eq(1)
expect(Array.new(4) { child_class.child_method }).to all eq("child_method")
expect(child_class.child_method_counter).to eq(4)
end
context "when the child class also memoizes methods" do
let(:child_class) do
Class.new(class_with_memo) do
class << self
prepend MemoWise
def child_method_counter
@child_method_counter || 0
end
def child_method
@child_method_counter = child_method_counter + 1
"child_method"
end
memo_wise :child_method
end
end
end
it "memoizes the parent and child methods separately" do
expect(Array.new(4) { child_class.no_args }).to all eq("no_args")
expect(child_class.no_args_counter).to eq(1)
expect(Array.new(4) { child_class.child_method }).to all eq("child_method")
expect(child_class.child_method_counter).to eq(1)
end
end
end
end
end
end
# These test cases would fail due to a JRuby bug
# Skipping to make build pass until the bug is fixed
# https://github.com/jruby/jruby/issues/6896
unless RUBY_PLATFORM == "java"
context "with module methods" do
context "when defined with 'def self.'" do
include_context "with context for module methods via 'def self.'"
# Use the module as the target of "#memo_wise shared examples"
let(:target) { module_with_memo }
it_behaves_like "#memo_wise shared examples"
it "creates a module-level instance variable" do
# NOTE: test implementation detail to ensure the inverse test is valid
expect(module_with_memo.instance_variables).to include(:@_memo_wise)
end
context "when an invalid hash key is passed to .memo_wise" do
let(:module_with_memo) do
Module.new do
prepend MemoWise
def self.module_method; end
end
end
it "raises an error when passing a key which is not `self:`" do
expect { module_with_memo.send(:memo_wise, bad_key: :module_method) }.
to raise_error(ArgumentError, "`:self` is the only key allowed in memo_wise")
end
end
end
context "when defined with scope 'module << self'" do
include_context "with context for module methods via scope 'class << self'"
# Use the module as the target of "#memo_wise shared examples"
let(:target) { module_with_memo }
it_behaves_like "#memo_wise shared examples"
it "creates a module-level instance variable" do
# NOTE: this test ensure the inverse test above continues to be valid
expect(module_with_memo.instance_variables).to include(:@_memo_wise)
end
end
end
end
context "with module mixed into other classes" do
context "when extended" do
context "when defined with 'def'" do
include_context "with context for module methods via normal scope"
before(:each) { stub_const("ModuleWithMemo", module_with_memo) }
let(:class_extending_module_with_memo) do
Class.new do
extend ModuleWithMemo
end
end
let(:target) { class_extending_module_with_memo }
it_behaves_like "#memo_wise shared examples"
end
context "when 1 module extended by 2 classes" do
let(:module_with_memo) do
Module.new do
prepend MemoWise
def test_method
Random.rand
end
memo_wise :test_method
end
end
let(:class_a_extending_module_with_memo) do
Class.new do
extend ModuleWithMemo
end
end
let(:class_b_extending_module_with_memo) do
Class.new do
extend ModuleWithMemo
end
end
before(:each) do
stub_const("ModuleWithMemo", module_with_memo)
end
it "memoizes each extended class separately" do
aggregate_failures do
expect(class_a_extending_module_with_memo.test_method). # rubocop:disable RSpec/IdenticalEqualityAssertion
to eq(class_a_extending_module_with_memo.test_method)
expect(class_b_extending_module_with_memo.test_method). # rubocop:disable RSpec/IdenticalEqualityAssertion
to eq(class_b_extending_module_with_memo.test_method)
expect(class_a_extending_module_with_memo.test_method).
to_not eq(class_b_extending_module_with_memo.test_method)
end
end
end
end
context "when included" do
context "when defined with 'def'" do
include_context "with context for module methods via normal scope"
before(:each) do
stub_const("ModuleWithMemo", module_with_memo)
end
let(:class_including_module_with_memo) do
Class.new do
include ModuleWithMemo
end
end
let(:instance) { class_including_module_with_memo.new }
let(:target) { instance }
it_behaves_like "#memo_wise shared examples"
it_behaves_like "handles memoized/non-memoized methods with the same name at different scopes" do
let(:memoized) { instance }
let(:non_memoized) { module_with_memo }
let(:non_memoized_name) { :module }
end
end
# These test cases would fail due to a JRuby bug
# Skipping to make build pass until the bug is fixed
unless RUBY_PLATFORM == "java"
context "when defined with 'def self.' and 'def'" do
let(:module_with_memo) do
Module.new do
prepend MemoWise
def self.test_method
Random.rand
end
memo_wise self: :test_method
def test_method
Random.rand
end
memo_wise :test_method
end
end
let(:class_including_module_with_memo) do
Class.new do
include ModuleWithMemo
end
end
let(:instance) { class_including_module_with_memo.new }
before(:each) do
stub_const("ModuleWithMemo", module_with_memo)
end
it "memoizes instance and singleton methods separately" do
aggregate_failures do
expect(instance.test_method).to eq(instance.test_method) # rubocop:disable RSpec/IdenticalEqualityAssertion
expect(module_with_memo.test_method).to eq(module_with_memo.test_method) # rubocop:disable RSpec/IdenticalEqualityAssertion
expect(instance.test_method).to_not eq(module_with_memo.test_method)
end
end
end
end
end
context "when prepended" do
context "when defined with 'def'" do
include_context "with context for module methods via normal scope"
before(:each) do
stub_const("ModuleWithMemo", module_with_memo)
end
let(:class_prepending_module_with_memo) do
Class.new do
prepend ModuleWithMemo
end
end
let(:instance) { class_prepending_module_with_memo.new }
let(:target) { instance }
it_behaves_like "#memo_wise shared examples"
it_behaves_like "handles memoized/non-memoized methods with the same name at different scopes" do
let(:memoized) { instance }
let(:non_memoized) { module_with_memo }
let(:non_memoized_name) { :module }
end
end
end
end
end
end
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