Class: ActionCable::Channel::TestCase

Relationships & Source Files
Namespace Children
Modules: `Behavior`
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, `::ActiveSupport::TestCase`, `::ActiveSupport::Testing::Declarative`, Minitest::Test
Instance Chain: self, `Behavior`, `::ActionCable::TestHelper`, `::ActiveSupport::Testing::ConstantLookup`, `::ActiveSupport::TestCase`, `::ActiveSupport::Testing::FileFixtures`, `::ActiveSupport::Testing::TimeHelpers`, `::ActiveSupport::Testing::ConstantStubbing`, `::ActiveSupport::Testing::Deprecation`, `::ActiveSupport::Testing::ErrorReporterAssertions`, `::ActiveSupport::Testing::Assertions`, `::ActiveSupport::Testing::SetupAndTeardown`, Minitest::Test
Inherits:	ActiveSupport::TestCase `::Object` Minitest::Test ActiveSupport::TestCase ActionCable::Channel::TestCase
Defined in:	actioncable/lib/action_cable/channel/test_case.rb

Overview

Superclass for Action Cable channel functional tests.

Basic example

Functional tests are written as follows:

First, one uses the subscribe method to simulate subscription creation.
Then, one asserts whether the current state is as expected. “State” can be anything: transmitted messages, subscribed streams, etc.

For example:

class ChatChannelTest < ActionCable::Channel::TestCase
  def test_subscribed_with_room_number
    # Simulate a subscription creation
    subscribe room_number: 1

    # Asserts that the subscription was successfully created
    assert subscription.confirmed?

    # Asserts that the channel subscribes connection to a stream
    assert_has_stream "chat_1"

    # Asserts that the channel subscribes connection to a specific
    # stream created for a model
    assert_has_stream_for Room.find(1)
  end

  def test_does_not_stream_with_incorrect_room_number
    subscribe room_number: -1

    # Asserts that not streams was started
    assert_no_streams
  end

  def test_does_not_subscribe_without_room_number
    subscribe

    # Asserts that the subscription was rejected
    assert subscription.rejected?
  end
end

You can also perform actions:

def test_perform_speak
  subscribe room_number: 1

  perform :speak, message: "Hello, Rails!"

  assert_equal "Hello, Rails!", transmissions.last["text"]
end

Special methods

TestCase will also automatically provide the following instance methods for use in the tests:

connection : An ConnectionStub, representing the current HTTP

connection.

subscription : An instance of the current channel, created when you call subscribe.

transmissions : A list of all messages that have been transmitted into the channel.

Channel is automatically inferred

TestCase will automatically infer the channel under test from the test class name. If the channel cannot be inferred from the test class name, you can explicitly set it with tests.

class SpecialEdgeCaseChannelTest < ActionCable::Channel::TestCase
  tests SpecialChannel
end

Specifying connection identifiers

You need to set up your connection manually to provide values for the identifiers. To do this just use:

stub_connection(user: users(:john))

Testing broadcasting

TestCase enhances ::ActionCable::TestHelper assertions (e.g. assert_broadcasts) to handle broadcasting to models:

# in your channel
def speak(data)
  broadcast_to room, text: data["message"]
end

def test_speak
  subscribe room_id: rooms(:chat).id

  assert_broadcast_on(rooms(:chat), text: "Hello, Rails!") do
    perform :speak, message: "Hello, Rails!"
  end
end

Constant Summary

`::ActiveSupport::TestCase` - Inherited

Assertion

`Behavior` - Included

CHANNEL_IDENTIFIER

Class Attribute Summary

`::ActiveSupport::TestCase` - Inherited

.file_fixture_path, .file_fixture_path?,
.test_order	Returns the order in which test cases are run.
.test_order=	Sets the order in which test cases are run.

Class Method Summary

`::ActiveSupport::TestCase` - Inherited

.fixture_paths	Returns the `::ActiveRecord::FixtureSet` collection.
.fixture_paths=	Sets the given path to the fixture set.
.parallelize	Parallelizes the test suite.
.parallelize_setup	Set up hook for parallel testing.
.parallelize_teardown	Clean up hook for parallel testing.

`::ActiveSupport::Testing::Declarative` - Extended

test	Helper to define a test method using a `::String`.

Instance Attribute Summary

`::ActionCable::TestHelper` - Included

#broadcasts, #clear_messages

`::ActiveSupport::TestCase` - Inherited

#file_fixture_path, #file_fixture_path?

Instance Method Summary

`Behavior` - Included

#assert_broadcast_on,
#assert_broadcasts	Enhance TestHelper assertions to handle non-String broadcastings.
#assert_has_no_stream	Asserts that the specified stream has not been started.
#assert_has_no_stream_for	Asserts that the specified stream for a model has not started.
#assert_has_stream	Asserts that the specified stream has been started.
#assert_has_stream_for	Asserts that the specified stream for a model has started.
#assert_no_streams	Asserts that no streams have been started.
#perform	Perform action on a channel.
#stub_connection	Set up test connection with the specified identifiers:
#subscribe	Subscribe to the channel under test.
#transmissions	Returns messages transmitted into channel.
#unsubscribe	Unsubscribe the subscription under test.

`::ActionCable::TestHelper` - Included

#assert_broadcast_on	Asserts that the specified message has been sent to the stream.
#assert_broadcasts	Asserts that the number of broadcasted messages to the stream matches the given number.
#assert_no_broadcasts	Asserts that no messages have been sent to the stream.
#capture_broadcasts	Returns the messages that are broadcasted in the block.

`::ActiveSupport::TestCase` - Inherited

#assert_no_match	Alias for: refute_match.
#assert_not_empty	Alias for: refute_empty.
#assert_not_equal	Alias for: refute_equal.
#assert_not_in_delta	Alias for: refute_in_delta.
#assert_not_in_epsilon	Alias for: refute_in_epsilon.
#assert_not_includes	Alias for: refute_includes.
#assert_not_instance_of	Alias for: refute_instance_of.
#assert_not_kind_of	Alias for: refute_kind_of.
#assert_not_nil	Alias for: refute_nil.
#assert_not_operator	Alias for: refute_operator.
#assert_not_predicate	Alias for: refute_predicate.
#assert_not_respond_to	Alias for: refute_respond_to.
#assert_not_same	Alias for: refute_same.
#method_name

`::ActiveSupport::Testing::FileFixtures` - Included

#file_fixture

Returns a ::Pathname to the fixture file named fixture_name.

`::ActiveSupport::Testing::TimeHelpers` - Included

#after_teardown,
#freeze_time	Calls `travel_to` with `Time.now`.
#travel	Changes current time to the time in the future or in the past by a given time difference by stubbing `Time.now`, `Date.today`, and `DateTime.now`.
#travel_back	Returns the current time back to its original state, by removing the stubs added by `travel`, `travel_to`, and `freeze_time`.
#travel_to	Changes current time to the given time by stubbing `Time.now`, `Time.new`, `Date.today`, and `DateTime.now` to return the time or date passed into this method.
#unfreeze_time	Alias for ActiveSupport::Testing::TimeHelpers#travel_back.

`::ActiveSupport::Testing::ConstantStubbing` - Included

#stub_const

Changes the value of a constant for the duration of a block.

`::ActiveSupport::Testing::Deprecation` - Included

#assert_deprecated	Asserts that a matching deprecation warning was emitted by the given deprecator during the execution of the yielded block.
#assert_not_deprecated	Asserts that no deprecation warnings are emitted by the given deprecator during the execution of the yielded block.
#collect_deprecations	Returns the return value of the block and an array of all the deprecation warnings emitted by the given ActionCable.deprecator during the execution of the yielded block.

`::ActiveSupport::Testing::ErrorReporterAssertions` - Included

#assert_error_reported	Assertion that the block should cause at least one exception to be reported to Rails.error.
#assert_no_error_reported	Assertion that the block should not cause an exception to be reported to Rails.error.

`::ActiveSupport::Testing::Assertions` - Included

#assert_changes	Assertion that the result of evaluating an expression is changed before and after invoking the passed in block.
#assert_difference	Test numeric difference between the return value of an expression as a result of what is evaluated in the yielded block.
#assert_no_changes	Assertion that the result of evaluating an expression is not changed before and after invoking the passed in block.
#assert_no_difference	Assertion that the numeric result of evaluating an expression is not changed before and after invoking the passed in block.
#assert_not	Asserts that an expression is not truthy.
#assert_nothing_raised	Assertion that the block should not raise an exception.
#assert_raise	Alias for ActiveSupport::Testing::Assertions#assert_raises.
#assert_raises	Asserts that a block raises one of `exp`.

Class Attribute Details

._channel_class (rw)

[ GitHub ]

# File 'actioncable/lib/action_cable/channel/test_case.rb', line 200


class_attribute :_channel_class

._channel_class? ⇒ `Boolean` (rw)

[ GitHub ]

# File 'actioncable/lib/action_cable/channel/test_case.rb', line 200


class_attribute :_channel_class

Instance Attribute Details

#_channel_class (rw)

[ GitHub ]

# File 'actioncable/lib/action_cable/channel/test_case.rb', line 200


class_attribute :_channel_class

#_channel_class? ⇒ `Boolean` (rw)

[ GitHub ]

# File 'actioncable/lib/action_cable/channel/test_case.rb', line 200


class_attribute :_channel_class

#connection (readonly)

[ GitHub ]

# File 'actioncable/lib/action_cable/channel/test_case.rb', line 202


attr_reader :connection, :subscription

#subscription (readonly)

[ GitHub ]

# File 'actioncable/lib/action_cable/channel/test_case.rb', line 202


attr_reader :connection, :subscription

Class: ActionCable::Channel::TestCase

Overview

Basic example

Special methods

Channel is automatically inferred

Specifying connection identifiers

Testing broadcasting

Constant Summary

::ActiveSupport::TestCase - Inherited

Behavior - Included

Behavior - Attributes & Methods

Class Attribute Summary

::ActiveSupport::TestCase - Inherited

Class Method Summary

::ActiveSupport::TestCase - Inherited

::ActiveSupport::Testing::Declarative - Extended

Instance Attribute Summary

::ActionCable::TestHelper - Included

::ActiveSupport::TestCase - Inherited

Instance Method Summary

Behavior - Included

::ActionCable::TestHelper - Included

::ActiveSupport::TestCase - Inherited

::ActiveSupport::Testing::FileFixtures - Included

::ActiveSupport::Testing::TimeHelpers - Included

::ActiveSupport::Testing::ConstantStubbing - Included

::ActiveSupport::Testing::Deprecation - Included

::ActiveSupport::Testing::ErrorReporterAssertions - Included

::ActiveSupport::Testing::Assertions - Included

Class Attribute Details

._channel_class (rw)

._channel_class? ⇒ Boolean (rw)

Instance Attribute Details

#_channel_class (rw)

#_channel_class? ⇒ Boolean (rw)

#connection (readonly)

#subscription (readonly)

`::ActiveSupport::TestCase` - Inherited

`Behavior` - Included

`Behavior` - Attributes & Methods

`::ActiveSupport::TestCase` - Inherited

`::ActiveSupport::TestCase` - Inherited

`::ActiveSupport::Testing::Declarative` - Extended

`::ActionCable::TestHelper` - Included

`::ActiveSupport::TestCase` - Inherited

`Behavior` - Included

`::ActionCable::TestHelper` - Included

`::ActiveSupport::TestCase` - Inherited

`::ActiveSupport::Testing::FileFixtures` - Included

`::ActiveSupport::Testing::TimeHelpers` - Included

`::ActiveSupport::Testing::ConstantStubbing` - Included

`::ActiveSupport::Testing::Deprecation` - Included

`::ActiveSupport::Testing::ErrorReporterAssertions` - Included

`::ActiveSupport::Testing::Assertions` - Included

._channel_class? ⇒ `Boolean` (rw)

#_channel_class? ⇒ `Boolean` (rw)