module Rails::Generators::Testing::Assertions

def assert_class_method(method, content, &block)

end
end
assert_match(/create_table/, up)
assert_class_method :up, migration do |up|
assert_migration "db/migrate/create_products.rb" do |migration|

When a block is given, it yields the content of the method.
class methods inside (class << self), only class methods which starts with "self.".
Asserts the given class method exists in the given content. This method does not detect 
def assert_class_method(method, content, &block)
  assert_instance_method "self.#{method}", content, &block
end

def assert_field_default_value(attribute_type, value)

assert_field_default_value :string, "MyString"

Asserts the given attribute type gets a proper default value: 
def assert_field_default_value(attribute_type, value)
  if value.nil?
    assert_nil(create_generated_attribute(attribute_type).default)
  else
    assert_equal(value, create_generated_attribute(attribute_type).default)
  end
end

def assert_field_type(attribute_type, field_type)

assert_field_type :date, :date_select

properly:
Asserts the given attribute type gets translated to a field type 
def assert_field_type(attribute_type, field_type)
  assert_equal(field_type, create_generated_attribute(attribute_type).field_type)
end

def assert_file(relative, *contents)

end
end
assert_match(/Product\.all/, index)
assert_instance_method :index, controller do |index|
assert_file "app/controllers/products_controller.rb" do |controller|

Finally, when a block is given, it yields the file content:

assert_file "config/environment.rb", /initialize/

file with the given string:
regular expression matches the given file content. If it's a string, it compares the
You can also give extra arguments. If the argument is a regexp, it will check if the

assert_file "config/environment.rb"

to the configured destination:
Asserts a given file exists. You need to supply an absolute path or a path relative 
def assert_file(relative, *contents)
  absolute = File.expand_path(relative, destination_root)
  assert File.exist?(absolute), "Expected file #{relative.inspect} to exist, but does not"
  read = File.read(absolute) if block_given? || !contents.empty?
  assert_nothing_raised { yield read } if block_given?
  contents.each do |content|
    case content
    when String
      assert_equal content, read
    when Regexp
      assert_match content, read
    end
  end
end

def assert_instance_method(method, content)

end
end
assert_match(/Product\.all/, index)
assert_instance_method :index, controller do |index|
assert_file "app/controllers/products_controller.rb" do |controller|

it yields the content of the method.
Asserts the given method exists in the given content. When a block is given, 
def assert_instance_method(method, content)
  assert content =~ /(\s+)def #{method}(\(.+\))?(.*?)\n\1end/m, "Expected to have method #{method}"
  assert_nothing_raised { yield $3.strip } if block_given?
end

def assert_migration(relative, *contents, &block)

Consequently, assert_migration accepts the same arguments has assert_file.

assert_file "db/migrate/003_create_products.rb"

matches the migration name. For example, the call above is converted to:
This method manipulates the given path and tries to find any migration which

assert_migration "db/migrate/create_products.rb"

path relative to the configured destination:
Asserts a given migration exists. You need to supply an absolute path or a 
def assert_migration(relative, *contents, &block)
  file_name = migration_file_name(relative)
  assert file_name, "Expected migration #{relative} to exist, but was not found"
  assert_file file_name, *contents, &block
end

def assert_no_file(relative)

assert_no_file "config/random.rb"

path relative to the configured destination:
Asserts a given file does not exist. You need to supply an absolute path or a 
def assert_no_file(relative)
  absolute = File.expand_path(relative, destination_root)
  assert !File.exist?(absolute), "Expected file #{relative.inspect} to not exist, but does"
end

def assert_no_migration(relative)

assert_no_migration "db/migrate/create_products.rb"

path relative to the configured destination:
Asserts a given migration does not exist. You need to supply an absolute path or a 
def assert_no_migration(relative)
  file_name = migration_file_name(relative)
  assert_nil file_name, "Expected migration #{relative} to not exist, but found #{file_name}"
end