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<h1>Module <code>pl.test</code></h1>
<p>Useful test utilities.</p>
<p>
<pre>
test.asserteq({<span class="number">1</span>,<span class="number">2</span>},{<span class="number">1</span>,<span class="number">2</span>}) <span class="comment">-- can compare tables
</span>test.asserteq(<span class="number">1.2</span>,<span class="number">1.19</span>,<span class="number">0.02</span>) <span class="comment">-- compare FP numbers within precision
</span>T = test.tuple <span class="comment">-- used for comparing multiple results
</span>test.asserteq(T(<span class="global">string</span>.find(<span class="string">" me"</span>,<span class="string">"me"</span>)),T(<span class="number">2</span>,<span class="number">3</span>))
</pre>
<p> Dependencies: <a href="../libraries/pl.utils.html#">pl.utils</a>, <a href="../libraries/pl.tablex.html#">pl.tablex</a>, <a href="../libraries/pl.pretty.html#">pl.pretty</a>, <a href="../libraries/pl.path.html#">pl.path</a>, <a href="https://www.lua.org/manual/5.1/manual.html#5.9">debug</a></p>
</p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#error_handler">error_handler (file, line, got_text, needed_text, msg)</a></td>
<td class="summary">error handling for test results.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#complain">complain (x, y, msg, where)</a></td>
<td class="summary">general test complain message.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#asserteq">asserteq (x, y, eps, where)</a></td>
<td class="summary">like assert, except takes two arguments that must be equal and can be tables.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#assertmatch">assertmatch (s1, s2, where)</a></td>
<td class="summary">assert that the first string matches the second.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#assertraise">assertraise (fn, e, where)</a></td>
<td class="summary">assert that the function raises a particular error.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#asserteq2">asserteq2 (x1, x2, y1, y2, where)</a></td>
<td class="summary">a version of asserteq that takes two pairs of values.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#tuple">tuple (...)</a></td>
<td class="summary">encode an arbitrary argument list as a tuple.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#timer">timer (msg, n, fun, ...)</a></td>
<td class="summary">Time a function.</td>
</tr>
</table>
<br/>
<br/>
<h2 class="section-header "><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "error_handler"></a>
<strong>error_handler (file, line, got_text, needed_text, msg)</strong>
</dt>
<dd>
error handling for test results.
By default, this writes to stderr and exits the program.
Re-define this function to raise an error and/or redirect output
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">file</span>
</li>
<li><span class="parameter">line</span>
</li>
<li><span class="parameter">got_text</span>
</li>
<li><span class="parameter">needed_text</span>
</li>
<li><span class="parameter">msg</span>
</li>
</ul>
</dd>
<dt>
<a name = "complain"></a>
<strong>complain (x, y, msg, where)</strong>
</dt>
<dd>
general test complain message.
Useful for composing new test functions (see tests/tablex.lua for an example)
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">x</span>
a value
</li>
<li><span class="parameter">y</span>
value to compare first value against
</li>
<li><span class="parameter">msg</span>
message
</li>
<li><span class="parameter">where</span>
extra level offset for errors
</li>
</ul>
</dd>
<dt>
<a name = "asserteq"></a>
<strong>asserteq (x, y, eps, where)</strong>
</dt>
<dd>
like assert, except takes two arguments that must be equal and can be tables.
If they are plain tables, it will use tablex.deepcompare.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">x</span>
any value
</li>
<li><span class="parameter">y</span>
a value equal to x
</li>
<li><span class="parameter">eps</span>
an optional tolerance for numerical comparisons
</li>
<li><span class="parameter">where</span>
extra level offset
</li>
</ul>
</dd>
<dt>
<a name = "assertmatch"></a>
<strong>assertmatch (s1, s2, where)</strong>
</dt>
<dd>
assert that the first string matches the second.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">s1</span>
a string
</li>
<li><span class="parameter">s2</span>
a string
</li>
<li><span class="parameter">where</span>
extra level offset
</li>
</ul>
</dd>
<dt>
<a name = "assertraise"></a>
<strong>assertraise (fn, e, where)</strong>
</dt>
<dd>
assert that the function raises a particular error.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">fn</span>
a function or a table of the form {function,arg1,...}
</li>
<li><span class="parameter">e</span>
a string to match the error against
</li>
<li><span class="parameter">where</span>
extra level offset
</li>
</ul>
</dd>
<dt>
<a name = "asserteq2"></a>
<strong>asserteq2 (x1, x2, y1, y2, where)</strong>
</dt>
<dd>
a version of asserteq that takes two pairs of values.
<code>x1==y1 and x2==y2</code> must be true. Useful for functions that naturally
return two values.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">x1</span>
any value
</li>
<li><span class="parameter">x2</span>
any value
</li>
<li><span class="parameter">y1</span>
any value
</li>
<li><span class="parameter">y2</span>
any value
</li>
<li><span class="parameter">where</span>
extra level offset
</li>
</ul>
</dd>
<dt>
<a name = "tuple"></a>
<strong>tuple (...)</strong>
</dt>
<dd>
encode an arbitrary argument list as a tuple.
This can be used to compare to other argument lists, which is
very useful for testing functions which return a number of values.
Unlike regular array-like tables ('sequences') they may contain nils.
Tuples understand equality and know how to print themselves out.
The # operator is defined to be the size, irrespecive of any nils,
and there is an <a href="https://www.lua.org/manual/5.1/manual.html#pdf-unpack">unpack</a> method.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">...</span>
</li>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example">asserteq(tuple( (<span class="string">'ab'</span>):find <span class="string">'a'</span>), tuple(<span class="number">1</span>,<span class="number">1</span>))</pre>
</ul>
</dd>
<dt>
<a name = "timer"></a>
<strong>timer (msg, n, fun, ...)</strong>
</dt>
<dd>
Time a function. Call the function a given number of times, and report the number of seconds taken,
together with a message. Any extra arguments will be passed to the function.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">msg</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
a descriptive message
</li>
<li><span class="parameter">n</span>
<span class="types"><span class="type">int</span></span>
number of times to call the function
</li>
<li><span class="parameter">fun</span>
<span class="types"><span class="type">func</span></span>
the function
</li>
<li><span class="parameter">...</span>
optional arguments to fun
</li>
</ul>
</dd>
</dl>
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