Backfill tests for ExcerptHelper

test/helpers/excerpt_helper_test.rb

@@ -0,0 +1,30 @@
+require "test_helper"
+
+class ExcerptHelperTest < ActionView::TestCase
+  test "quote" do
+    assert_excerpt("> Hello world", ">    Hello world")
+  end
+
+  test "ul" do
+    assert_excerpt("• Hello world", "-    Hello world")
+    assert_excerpt("• Hello world", "  -    Hello world")
+  end
+
+  test "ol" do
+    assert_excerpt("99. Hello world", "99. Hello world")
+  end
+
+  test "large spaces" do
+    assert_excerpt("Hello world", "   Hello    world     ")
+  end
+
+  test "long text" do
+    assert_excerpt("A"*197 + "...", "A"*1000)
+    assert_excerpt("A"*97 + "...", "A"*1000, length: 100)
+  end
+
+  private
+    def assert_excerpt(expected, content, ...)
+      assert_equal expected, format_excerpt(ActionText::Content.new(content), ...), "Excerpt of Action Text Content does not match"
+    end
+end