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May 1, 2022 18:54
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Refined Minitest Assertions
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class RefinedAssertions | |
@mutex = Mutex.new | |
def self.set_last_operator(operator, lhs, rhs, res) | |
@mutex.synchronize do | |
@set = true | |
@result = [operator, lhs, rhs, res] | |
end | |
end | |
def self.result | |
@mutex.synchronize do | |
@result | |
end | |
end | |
def self.set? | |
@mutex.synchronize do | |
@set | |
end | |
end | |
def self.unset | |
@mutex.synchronize do | |
@set = false | |
end | |
end | |
module ComparisonOperatorsPrepend | |
# NOTE: Cannot do =~ because it breaks in some dependency | |
MODULES = [:==, :!=, :<, :>, :<=, :>=, :is_a?, :<=>].map do |operator| | |
mod = Module.new do | |
define_method(operator) do |other| | |
res = super(other) | |
RefinedAssertions.set_last_operator(operator, self, other, res) | |
res | |
end | |
end | |
[operator, mod] | |
end.to_h | |
MODULES.each do |operator, mod| | |
Object.descendants.select { |d| d.method_defined?(operator) }.map do |descendant| | |
# puts "Prepending #{operator} to #{descendant}" | |
begin | |
descendant.prepend(mod) | |
rescue StandardError | |
end | |
end | |
end | |
end | |
end | |
module Minitest::Assertions | |
alias_method :orig_assert, :assert | |
def assert(test, msg = nil) | |
msg ||= proc do | |
if RefinedAssertions.set? | |
operator, lhs, rhs, result = RefinedAssertions.result | |
result_str = result.inspect | |
lhs_str = lhs.inspect | |
rhs_str = rhs.inspect | |
res = "Expected `#{lhs_str} #{operator} #{rhs_str}` to be truthy, was: #{result_str}." | |
if operator == :== | |
res += "\n" + diff(lhs, rhs) | |
end | |
RefinedAssertions.unset | |
res | |
end | |
end | |
orig_assert(test, msg) | |
end | |
alias_method :orig_refute, :refute | |
def refute(test, msg = nil) | |
msg ||= proc do | |
if RefinedAssertions.set? | |
operator, lhs, rhs, result = RefinedAssertions.res | |
res = "Expected `#{lhs.inspect} #{operator} #{rhs.inspect}` to not be truthy, was: #{result.inspect}." | |
RefinedAssertions.unset | |
res | |
end | |
end | |
orig_refute(test, msg) | |
end | |
end |
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This code allows syntax like
On failure, it will print messages like
It does so with somewhat of a dirty hack: Prepending custom overloaded operators to all existing classes that do what they normally do, but on top of that sets a global variable which can be read out by assert/refute.