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方法
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实例公共方法

assert_deprecated(deprecator, &block)
assert_deprecated(match, deprecator, &block)

断言在执行给定块时，给定 deprecator 发出了匹配的弃用警告。

assert_deprecated(/foo/, CustomDeprecator) do
  CustomDeprecator.warn "foo should no longer be used"
end

match 对象可以是 Regexp 或出现在消息中的 String。

assert_deprecated('foo', CustomDeprecator) do
  CustomDeprecator.warn "foo should no longer be used"
end

如果省略 match（或显式为 nil），则任何弃用警告都将匹配。

assert_deprecated(CustomDeprecator) do
  CustomDeprecator.warn "foo should no longer be used"
end

来源：显示 | 在 GitHub 上

# File activesupport/lib/active_support/testing/deprecation.rb, line 30
def assert_deprecated(match = nil, deprecator = nil, &block)
  match, deprecator = nil, match if match.is_a?(ActiveSupport::Deprecation)

  unless deprecator
    raise ArgumentError, "No deprecator given"
  end

  result, warnings = collect_deprecations(deprecator, &block)
  assert !warnings.empty?, "Expected a deprecation warning within the block but received none"
  if match
    match = Regexp.new(Regexp.escape(match)) unless match.is_a?(Regexp)
    assert warnings.any? { |w| match.match?(w) }, "No deprecation warning matched #{match}: #{warnings.join(', ')}"
  end
  result
end

assert_not_deprecated(deprecator, &block)

断言在执行给定块时，给定 deprecator 没有发出任何弃用警告。

assert_not_deprecated(CustomDeprecator) do
  CustomDeprecator.warn "message" # fails assertion
end

assert_not_deprecated(ActiveSupport::Deprecation.new) do
  CustomDeprecator.warn "message" # passes assertion, different deprecator
end

来源：显示 | 在 GitHub 上

# File activesupport/lib/active_support/testing/deprecation.rb, line 55
def assert_not_deprecated(deprecator, &block)
  result, deprecations = collect_deprecations(deprecator, &block)
  assert deprecations.empty?, "Expected no deprecation warning within the block but received #{deprecations.size}: \n  #{deprecations * "\n  "}"
  result
end

collect_deprecations(deprecator)

返回块的返回值以及在执行给定块时，给定 deprecator 发出的所有弃用警告的数组。

collect_deprecations(CustomDeprecator) do
  CustomDeprecator.warn "message"
  ActiveSupport::Deprecation.new.warn "other message"
  :result
end # => [:result, ["message"]]

来源：显示 | 在 GitHub 上

# File activesupport/lib/active_support/testing/deprecation.rb, line 69
def collect_deprecations(deprecator)
  old_behavior = deprecator.behavior
  deprecations = []
  deprecator.behavior = Proc.new do |message, callstack|
    deprecations << message
  end
  result = yield
  [result, deprecations]
ensure
  deprecator.behavior = old_behavior
end