fixed FIXMEs

unit-testing.html

@@ -141,7 +141,7 @@ function to_roman(n):
     '''convert integer to Roman numeral'''
 <a>    pass                                   <span class=u>&#x2460;</span></a></code></pre>
 <ol>
-<li>At this stage, you want to define the <abbr>API</abbr> of the <code>to_roman()</code> function, but you don&#8217;t want to code it yet. (Your test needs to fail first.) To stub it out, use the Python reserved word <code>pass</code> [FIXME ref], which does precisely nothing.
+<li>At this stage, you want to define the <abbr>API</abbr> of the <code>to_roman()</code> function, but you don&#8217;t want to code it yet. (Your test needs to fail first.) To stub it out, use the Python reserved word <code>pass</code>, which does precisely nothing.
 </ol>
 <p>Execute <code>romantest1.py</code> on the command line to run the test. If you call it with the <code>-v</code> command-line option, it will give more verbose output so you can see exactly what&#8217;s going on as each test case runs. With any luck, your output should look like this:
 <pre class=screen>
@@ -254,7 +254,7 @@ OK</samp></pre>
 <li>Like the previous test case, the test itself is a method of the class, with a name starting with <code>test</code>.
 <li>The <code>unittest.TestCase</code> class provides the <code>assertRaises</code> method, which takes the following arguments: the exception you&#8217;re expecting, the function you&#8217;re testing, and the arguments you&#8217;re passing to that function. (If the function you&#8217;re testing takes more than one argument, pass them all to <code>assertRaises</code>, in order, and it will pass them right along to the function you&#8217;re testing.)
 </ol>
-<p>Pay close attention to this last line of code. Instead of calling <code>to_roman()</code> directly and manually checking that it raises a particular exception (by wrapping it in a <code>try...except</code> block [FIXME xref]), the <code>assertRaises</code> method has encapsulated all of that for us. All you do is tell it what exception you&#8217;re expecting (<code>roman2.OutOfRangeError</code>), the function (<code>to_roman()</code>), and the function&#8217;s arguments (<code>4000</code>). The <code>assertRaises</code> method takes care of calling <code>to_roman()</code> and checking that it raises <code>roman2.OutOfRangeError</code>.
+<p>Pay close attention to this last line of code. Instead of calling <code>to_roman()</code> directly and manually checking that it raises a particular exception (by wrapping it in <a href=your-first-python-program.html#exceptions>a <code>try...except</code> block</a>), the <code>assertRaises</code> method has encapsulated all of that for us. All you do is tell it what exception you&#8217;re expecting (<code>roman2.OutOfRangeError</code>), the function (<code>to_roman()</code>), and the function&#8217;s arguments (<code>4000</code>). The <code>assertRaises</code> method takes care of calling <code>to_roman()</code> and checking that it raises <code>roman2.OutOfRangeError</code>.
 <p>Also note that you&#8217;re passing the <code>to_roman()</code> function itself as an argument; you&#8217;re not calling it, and you&#8217;re not passing the name of it as a string. Have I mentioned recently how handy it is that <a href=your-first-python-program.html#everythingisanobject>everything in Python is an object</a>?
 <p>So what happens when you run the test suite with this new test?
 <pre class=screen>