1 files changed, 287 insertions, 0 deletions
diff --git a/actionview/test/template/lookup_context_test.rb b/actionview/test/template/lookup_context_test.rb
new file mode 100644
index 0000000000..68e151f154
--- /dev/null
+++ b/actionview/test/template/lookup_context_test.rb
@@ -0,0 +1,287 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "abstract_controller/rendering"
+
+class LookupContextTest < ActiveSupport::TestCase
+  def setup
+    @lookup_context = ActionView::LookupContext.new(FIXTURE_LOAD_PATH, {})
+    ActionView::LookupContext::DetailsKey.clear
+  end
+
+  def teardown
+    I18n.locale = :en
+  end
+
+  test "allows to override default_formats with ActionView::Base.default_formats" do
+    formats = ActionView::Base.default_formats
+    ActionView::Base.default_formats = [:foo, :bar]
+
+    assert_equal [:foo, :bar], ActionView::LookupContext.new([]).default_formats
+  ensure
+    ActionView::Base.default_formats = formats
+  end
+
+  test "process view paths on initialization" do
+    assert_kind_of ActionView::PathSet, @lookup_context.view_paths
+  end
+
+  test "normalizes details on initialization" do
+    assert_equal Mime::SET.to_a, @lookup_context.formats
+    assert_equal :en, @lookup_context.locale
+  end
+
+  test "allows me to freeze and retrieve frozen formats" do
+    @lookup_context.formats.freeze
+    assert_predicate @lookup_context.formats, :frozen?
+  end
+
+  test "provides getters and setters for variants" do
+    @lookup_context.variants = [:mobile]
+    assert_equal [:mobile], @lookup_context.variants
+  end
+
+  test "provides getters and setters for formats" do
+    @lookup_context.formats = [:html]
+    assert_equal [:html], @lookup_context.formats
+  end
+
+  test "handles */* formats" do
+    @lookup_context.formats = ["*/*"]
+    assert_equal Mime::SET.to_a, @lookup_context.formats
+  end
+
+  test "handles explicitly defined */* formats fallback to :js" do
+    @lookup_context.formats = [:js, Mime::ALL]
+    assert_equal [:js, *Mime::SET.symbols], @lookup_context.formats
+  end
+
+  test "adds :html fallback to :js formats" do
+    @lookup_context.formats = [:js]
+    assert_equal [:js, :html], @lookup_context.formats
+  end
+
+  test "provides getters and setters for locale" do
+    @lookup_context.locale = :pt
+    assert_equal :pt, @lookup_context.locale
+  end
+
+  test "changing lookup_context locale, changes I18n.locale" do
+    @lookup_context.locale = :pt
+    assert_equal :pt, I18n.locale
+  end
+
+  test "delegates changing the locale to the I18n configuration object if it contains a lookup_context object" do
+    begin
+      I18n.config = ActionView::I18nProxy.new(I18n.config, @lookup_context)
+      @lookup_context.locale = :pt
+      assert_equal :pt, I18n.locale
+      assert_equal :pt, @lookup_context.locale
+    ensure
+      I18n.config = I18n.config.original_config
+    end
+
+    assert_equal :pt, I18n.locale
+  end
+
+  test "find templates using the given view paths and configured details" do
+    template = @lookup_context.find("hello_world", %w(test))
+    assert_equal "Hello world!", template.source
+
+    @lookup_context.locale = :da
+    template = @lookup_context.find("hello_world", %w(test))
+    assert_equal "Hey verden", template.source
+  end
+
+  test "find templates with given variants" do
+    @lookup_context.formats  = [:html]
+    @lookup_context.variants = [:phone]
+
+    template = @lookup_context.find("hello_world", %w(test))
+    assert_equal "Hello phone!", template.source
+
+    @lookup_context.variants = [:phone]
+    @lookup_context.formats  = [:text]
+
+    template = @lookup_context.find("hello_world", %w(test))
+    assert_equal "Hello texty phone!", template.source
+  end
+
+  test "found templates respects given formats if one cannot be found from template or handler" do
+    assert_called(ActionView::Template::Handlers::Builder, :default_format, returns: nil) do
+      @lookup_context.formats = [:text]
+      template = @lookup_context.find("hello", %w(test))
+      assert_equal [:text], template.formats
+    end
+  end
+
+  test "adds fallbacks to view paths when required" do
+    assert_equal 1, @lookup_context.view_paths.size
+
+    @lookup_context.with_fallbacks do
+      assert_equal 3, @lookup_context.view_paths.size
+      assert_includes @lookup_context.view_paths, ActionView::FallbackFileSystemResolver.new("")
+      assert_includes @lookup_context.view_paths, ActionView::FallbackFileSystemResolver.new("/")
+    end
+  end
+
+  test "add fallbacks just once in nested fallbacks calls" do
+    @lookup_context.with_fallbacks do
+      @lookup_context.with_fallbacks do
+        assert_equal 3, @lookup_context.view_paths.size
+      end
+    end
+  end
+
+  test "generates a new details key for each details hash" do
+    keys = []
+    keys << @lookup_context.details_key
+    assert_equal 1, keys.uniq.size
+
+    @lookup_context.locale = :da
+    keys << @lookup_context.details_key
+    assert_equal 2, keys.uniq.size
+
+    @lookup_context.locale = :en
+    keys << @lookup_context.details_key
+    assert_equal 2, keys.uniq.size
+
+    @lookup_context.formats = [:html]
+    keys << @lookup_context.details_key
+    assert_equal 3, keys.uniq.size
+
+    @lookup_context.formats = nil
+    keys << @lookup_context.details_key
+    assert_equal 3, keys.uniq.size
+  end
+
+  test "gives the key forward to the resolver, so it can be used as cache key" do
+    @lookup_context.view_paths = ActionView::FixtureResolver.new("test/_foo.erb" => "Foo")
+    template = @lookup_context.find("foo", %w(test), true)
+    assert_equal "Foo", template.source
+
+    # Now we are going to change the template, but it won't change the returned template
+    # since we will hit the cache.
+    @lookup_context.view_paths.first.hash["test/_foo.erb"] = "Bar"
+    template = @lookup_context.find("foo", %w(test), true)
+    assert_equal "Foo", template.source
+
+    # This time we will change the locale. The updated template should be picked since
+    # lookup_context generated a new key after we changed the locale.
+    @lookup_context.locale = :da
+    template = @lookup_context.find("foo", %w(test), true)
+    assert_equal "Bar", template.source
+
+    # Now we will change back the locale and it will still pick the old template.
+    # This is expected because lookup_context will reuse the previous key for :en locale.
+    @lookup_context.locale = :en
+    template = @lookup_context.find("foo", %w(test), true)
+    assert_equal "Foo", template.source
+
+    # Finally, we can expire the cache. And the expected template will be used.
+    @lookup_context.view_paths.first.clear_cache
+    template = @lookup_context.find("foo", %w(test), true)
+    assert_equal "Bar", template.source
+  end
+
+  test "can disable the cache on demand" do
+    @lookup_context.view_paths = ActionView::FixtureResolver.new("test/_foo.erb" => "Foo")
+    old_template = @lookup_context.find("foo", %w(test), true)
+
+    template = @lookup_context.find("foo", %w(test), true)
+    assert_equal template, old_template
+
+    assert @lookup_context.cache
+    template = @lookup_context.disable_cache do
+      assert_not @lookup_context.cache
+      @lookup_context.find("foo", %w(test), true)
+    end
+    assert @lookup_context.cache
+
+    assert_not_equal template, old_template
+  end
+
+  test "responds to #prefixes" do
+    assert_equal [], @lookup_context.prefixes
+    @lookup_context.prefixes = ["foo"]
+    assert_equal ["foo"], @lookup_context.prefixes
+  end
+end
+
+class LookupContextWithFalseCaching < ActiveSupport::TestCase
+  def setup
+    @resolver = ActionView::FixtureResolver.new("test/_foo.erb" => ["Foo", Time.utc(2000)])
+    @lookup_context = ActionView::LookupContext.new(@resolver, {})
+  end
+
+  test "templates are always found in the resolver but timestamp is checked before being compiled" do
+    ActionView::Resolver.stub(:caching?, false) do
+      template = @lookup_context.find("foo", %w(test), true)
+      assert_equal "Foo", template.source
+
+      # Now we are going to change the template, but it won't change the returned template
+      # since the timestamp is the same.
+      @resolver.hash["test/_foo.erb"][0] = "Bar"
+      template = @lookup_context.find("foo", %w(test), true)
+      assert_equal "Foo", template.source
+
+      # Now update the timestamp.
+      @resolver.hash["test/_foo.erb"][1] = Time.now.utc
+      template = @lookup_context.find("foo", %w(test), true)
+      assert_equal "Bar", template.source
+    end
+  end
+
+  test "if no template was found in the second lookup, with no cache, raise error" do
+    ActionView::Resolver.stub(:caching?, false) do
+      template = @lookup_context.find("foo", %w(test), true)
+      assert_equal "Foo", template.source
+
+      @resolver.hash.clear
+      assert_raise ActionView::MissingTemplate do
+        @lookup_context.find("foo", %w(test), true)
+      end
+    end
+  end
+
+  test "if no template was cached in the first lookup, retrieval should work in the second call" do
+    ActionView::Resolver.stub(:caching?, false) do
+      @resolver.hash.clear
+      assert_raise ActionView::MissingTemplate do
+        @lookup_context.find("foo", %w(test), true)
+      end
+
+      @resolver.hash["test/_foo.erb"] = ["Foo", Time.utc(2000)]
+      template = @lookup_context.find("foo", %w(test), true)
+      assert_equal "Foo", template.source
+    end
+  end
+end
+
+class TestMissingTemplate < ActiveSupport::TestCase
+  def setup
+    @lookup_context = ActionView::LookupContext.new("/Path/to/views", {})
+  end
+
+  test "if no template was found we get a helpful error message including the inheritance chain" do
+    e = assert_raise ActionView::MissingTemplate do
+      @lookup_context.find("foo", %w(parent child))
+    end
+    assert_match %r{Missing template parent/foo, child/foo with .* Searched in:\n  \* "/Path/to/views"\n}, e.message
+  end
+
+  test "if no partial was found we get a helpful error message including the inheritance chain" do
+    e = assert_raise ActionView::MissingTemplate do
+      @lookup_context.find("foo", %w(parent child), true)
+    end
+    assert_match %r{Missing partial parent/_foo, child/_foo with .* Searched in:\n  \* "/Path/to/views"\n}, e.message
+  end
+
+  test "if a single prefix is passed as a string and the lookup fails, MissingTemplate accepts it" do
+    e = assert_raise ActionView::MissingTemplate do
+      details = { handlers: [], formats: [], variants: [], locale: [] }
+      @lookup_context.view_paths.find("foo", "parent", true, details)
+    end
+    assert_match %r{Missing partial parent/_foo with .* Searched in:\n  \* "/Path/to/views"\n}, e.message
+  end
+end