Add initial FileWatcher implementation. The Backend is just an abstract implementation, which will be inherited by backends that do the heavy lifting.

1 files changed, 65 insertions, 0 deletions

diff --git a/activesupport/test/file_watcher_test.rb b/activesupport/test/file_watcher_test.rb
new file mode 100644
index 0000000000..54aa9f92f1
--- /dev/null
+++ b/activesupport/test/file_watcher_test.rb
@@ -0,0 +1,65 @@
+require 'abstract_unit'
+
+class FileWatcherTest < ActiveSupport::TestCase
+  class DumbBackend < ActiveSupport::FileWatcher::Backend
+  end
+
+  def setup
+    @watcher = ActiveSupport::FileWatcher.new
+
+    # In real life, the backend would take the path and use it to observe the file
+    # system. In our case, we will manually trigger the events for unit testing,
+    # so we can pass any path.
+    @backend = DumbBackend.new("RAILS_WOOT", @watcher)
+
+    @payload = []
+    @watcher.watch %r{^app/assets/.*\.scss$} do |pay|
+      pay.each do |status, files|
+        files.sort!
+      end
+      @payload << pay
+    end
+  end
+
+  def test_one_change
+    @backend.trigger("app/assets/main.scss" => :changed)
+    assert_equal({:changed => ["app/assets/main.scss"]}, @payload.first)
+  end
+
+  def test_multiple_changes
+    @backend.trigger("app/assets/main.scss" => :changed, "app/assets/javascripts/foo.coffee" => :changed)
+    assert_equal([{:changed => ["app/assets/main.scss"]}], @payload)
+  end
+
+  def test_multiple_changes_match
+    @backend.trigger("app/assets/main.scss" => :changed, "app/assets/print.scss" => :changed, "app/assets/javascripts/foo.coffee" => :changed)
+    assert_equal([{:changed => ["app/assets/main.scss", "app/assets/print.scss"]}], @payload)
+  end
+
+  def test_multiple_state_changes
+    @backend.trigger("app/assets/main.scss" => :created, "app/assets/print.scss" => :changed)
+    assert_equal([{:changed => ["app/assets/print.scss"], :created => ["app/assets/main.scss"]}], @payload)
+  end
+
+  def test_more_blocks
+    payload = []
+    @watcher.watch %r{^config/routes\.rb$} do |pay|
+      payload << pay
+    end
+
+    @backend.trigger "config/routes.rb" => :changed
+    assert_equal [:changed => ["config/routes.rb"]], payload
+    assert_equal [], @payload
+  end
+
+  def test_overlapping_watchers
+    payload = []
+    @watcher.watch %r{^app/assets/main\.scss$} do |pay|
+      payload << pay
+    end
+
+    @backend.trigger "app/assets/print.scss" => :changed, "app/assets/main.scss" => :changed
+    assert_equal [:changed => ["app/assets/main.scss"]], payload
+    assert_equal [:changed => ["app/assets/main.scss", "app/assets/print.scss"]], @payload
+  end
+end