Module: WideEvent::TestHelper

Defined in:
lib/wide_event/test_helper.rb

Overview

Minitest assertions for wide-event instrumentation. Require from your test helper and include in ActiveSupport::TestCase:

require "wide_event/test_helper"
class ActiveSupport::TestCase
include WideEvent::TestHelper
end

Instance Method Summary collapse

Instance Method Details

#assert_registered_wide_event_attributes ⇒ Object

Fails if strict mode saw any attribute that isn't declared in the registry. Call from a dedicated test (or a teardown hook) with config.strict = true to make the registry an enforced schema.



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# File 'lib/wide_event/test_helper.rb', line 48

def assert_registered_wide_event_attributes
  registry = WideEvent.config.registry
  violations = registry ? registry.violations : []
  assert violations.empty?,
    "unregistered wide-event attributes #{violations.sort.inspect} - declare them in #{WideEvent.config.registry_path}"
end

#assert_wide_event(*keys, **pairs, &block) ⇒ Object

Runs the block inside an open wide event and asserts on the accumulated attributes. Bare string arguments assert presence; keyword-style pairs assert equality. Returns the attributes for further assertions.

assert_wide_event("pdf_render.duration_ms", "report.format" => "pdf") do
report.render
end


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# File 'lib/wide_event/test_helper.rb', line 18

def assert_wide_event(*keys, **pairs, &block)
  attrs = WideEvent.with do |store|
    block.call
    store.dup
  end
  keys.each do |key|
    assert attrs.key?(key), "expected wide event to have #{key.inspect}, got keys #{attrs.keys.inspect}"
  end
  pairs.each do |key, value|
    assert_equal value, attrs[key], "wide event attribute #{key.inspect}"
  end
  attrs
end

#capture_wide_events(&block) ⇒ Object

Swaps the sink for an in-memory one for the duration of the block and returns every wide event flushed inside it. Use around code that runs its own unit of work (jobs, full request dispatch).



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# File 'lib/wide_event/test_helper.rb', line 35

def capture_wide_events(&block)
  original = WideEvent.config.sink
  sink = Sinks::Memory.new
  WideEvent.config.sink = sink
  block.call
  sink.events
ensure
  WideEvent.config.sink = original
end