assertEquals("foo&bar", htmlEscaper().escape("foo&bar"));

    // If the string contains no escapes, it should return the arg.
    // Note: assert<b>Same</b> for this implementation.
    String s = "blah blah farhvergnugen";
    assertSame(s, htmlEscaper().escape(s));

    // Tests escapes at begin and end of string.
    assertEquals("&lt;p&gt;", htmlEscaper().escape("<p>"));

    // Test all escapes.