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@@ -472,7 +472,13 @@ module ActionController
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           matches
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         else
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           # RJS statement not found.
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-          flunk args.shift || "No RJS statement that replaces or inserts HTML content."
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+          case rjs_type
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+            when :remove, :show, :hide, :toggle
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+              flunk_message = "No RJS statement that #{rjs_type.to_s}s '#{id}' was rendered."
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+            else
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+              flunk_message = "No RJS statement that replaces or inserts HTML content."
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+          end
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+          flunk args.shift || flunk_message
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         end
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       end
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@@ -433,6 +433,17 @@ class AssertSelectTest < Test::Unit::TestCase
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     assert_select_rjs :remove, "test1"
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   end
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+  def test_assert_select_rjs_for_remove_offers_useful_error_when_assertion_fails
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+    render_rjs do |page|
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+      page.remove "test_with_typo"
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+    end
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+
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+    assert_select_rjs :remove, "test1"
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+
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+    rescue Test::Unit::AssertionFailedError
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+      assert_equal "No RJS statement that removes 'test1' was rendered.", $!.message
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+  end
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+
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   def test_assert_select_rjs_for_remove_ignores_block
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     render_rjs do |page|
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       page.remove "test1"
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@@ -454,6 +465,17 @@ class AssertSelectTest < Test::Unit::TestCase
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     assert_select_rjs :show, "test1"
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   end
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+  def test_assert_select_rjs_for_show_offers_useful_error_when_assertion_fails
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+    render_rjs do |page|
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+      page.show "test_with_typo"
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+    end
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+
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+    assert_select_rjs :show, "test1"
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+
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+    rescue Test::Unit::AssertionFailedError
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+      assert_equal "No RJS statement that shows 'test1' was rendered.", $!.message
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+  end
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+
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   def test_assert_select_rjs_for_show_ignores_block
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     render_rjs do |page|
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       page.show "test1"
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@@ -475,6 +497,17 @@ class AssertSelectTest < Test::Unit::TestCase
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     assert_select_rjs :hide, "test1"
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   end
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+  def test_assert_select_rjs_for_hide_offers_useful_error_when_assertion_fails
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+    render_rjs do |page|
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+      page.hide "test_with_typo"
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+    end
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+
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+    assert_select_rjs :hide, "test1"
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+
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+    rescue Test::Unit::AssertionFailedError
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+      assert_equal "No RJS statement that hides 'test1' was rendered.", $!.message
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+  end
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+
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   def test_assert_select_rjs_for_hide_ignores_block
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     render_rjs do |page|
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       page.hide "test1"
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@@ -496,6 +529,17 @@ class AssertSelectTest < Test::Unit::TestCase
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     assert_select_rjs :toggle, "test1"
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   end
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+  def test_assert_select_rjs_for_toggle_offers_useful_error_when_assertion_fails
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+    render_rjs do |page|
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+      page.toggle "test_with_typo"
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+    end
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+
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+    assert_select_rjs :toggle, "test1"
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+
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+    rescue Test::Unit::AssertionFailedError
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+      assert_equal "No RJS statement that toggles 'test1' was rendered.", $!.message
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+  end
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+
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   def test_assert_select_rjs_for_toggle_ignores_block
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     render_rjs do |page|
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       page.toggle "test1"