add apt_update matcher

examples/apt_update/recipes/periodic.rb

@@ -0,0 +1,5 @@
+apt_repository 'default_action'
+
+apt_update 'explicit_action' do
+  action :periodic
+end

examples/apt_update/recipes/update.rb

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+apt_update 'update_repo' do
+  action :update
+end

examples/apt_update/spec/periodic_spec.rb

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+require 'chefspec'
+
+describe 'apt_update::periodic' do
+  let(:chef_run) { ChefSpec::SoloRunner.converge(described_recipe) }
+
+  it 'updates apt with default action' do
+    expect(chef_run).to periodic_apt_update('default_action')
+    expect(chef_run).to_not periodic_apt_update('not_default_action')
+  end
+
+  it 'installs a apt_repository with an explicit action' do
+    expect(chef_run).to periodic_apt_update('explicit_action')
+  end
+end

examples/apt_update/spec/update_spec.rb

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+require 'chefspec'
+
+describe 'apt_update::update' do
+  let(:chef_run) { ChefSpec::SoloRunner.converge(described_recipe) }
+
+  it 'updates apt repo' do
+    expect(chef_run).to update_apt_update('update_repo')
+  end
+end

lib/chefspec/api/apt_update.rb

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+module ChefSpec::API
+  # @since 3.0.0
+  module AptRepositoryMatchers
+    ChefSpec.define_matcher :apt_update
+
+    #
+    # Assert that an +apt_update+ resource exists in the Chef run with the
+    # action +:update+. Given a Chef Recipe that adds "rsyslog" as a repository
+    # to update.
+    #     apt_repository 'rsyslog' do
+    #       action :update
+    #     end
+    #
+    # The Examples section demonstrates the different ways to test an
+    # +apt_update+ resource with ChefSpec.
+    #
+    # @example Assert that an +apt_update+ was run
+    #   expect(chef_run).to update_apt_update('rsyslog')
+    # @param [String, Regex] resource_name
+    #   the name of the resource to match
+    #
+    # @return [ChefSpec::Matchers::ResourceMatcher]
+
+    def update_apt_update(resource_name)
+      ChefSpec::Matchers::ResourceMatcher.new(:apt_update, :update,
+                                              resource_name)
+    end
+
+    #
+    # Assert that an +apt_update+ resource exists in the Chef run
+    # with the action +:periodic+. Given a Chef Recipe that updates "rsyslog"
+    # as an +apt_update+: periodically
+    #
+    #     apt_update 'rsyslog' do
+    #       action :periodic
+    #     end
+    #
+    # The Examples section demonstrates the different ways to test an
+    # +apt_update+ resource with ChefSpec.
+    #
+    # @example Assert that an +apt_update+ was updated periodically
+    #   expect(chef_run).to periodic_apt_update('rsyslog')
+    # @param [String, Regex] resource_name
+    #   the name of the resource to match
+    #
+    # @return [ChefSpec::Matchers::ResourceMatcher]
+
+
+  end
+end