585 lines
22 KiB
HTML
585 lines
22 KiB
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Simple Test for PHP web script testing documentation</title>
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<link rel="stylesheet" type="text/css" href="docs.css" title="Styles">
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</head>
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<body>
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<div class="menu_back"><div class="menu">
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<a href="index.html">SimpleTest</a>
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<a href="overview.html">Overview</a>
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<a href="unit_test_documentation.html">Unit tester</a>
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<a href="group_test_documentation.html">Group tests</a>
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<a href="mock_objects_documentation.html">Mock objects</a>
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<a href="partial_mocks_documentation.html">Partial mocks</a>
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<a href="reporter_documentation.html">Reporting</a>
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<a href="expectation_documentation.html">Expectations</a>
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<span class="chosen">Web tester</span>
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<a href="form_testing_documentation.html">Testing forms</a>
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<a href="authentication_documentation.html">Authentication</a>
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<a href="browser_documentation.html">Scriptable browser</a>
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</div></div>
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<h1>Web tester documentation</h1>
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This page...
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<ul>
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<li>
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Successfully <a href="#fetch">fetching a web page</a>
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</li>
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<li>
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Testing the <a href="#content">page content</a>
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</li>
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<li>
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<a href="#navigation">Navigating a web site</a>
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while testing
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</li>
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<li>
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<a href="#request">Raw request modifications</a> and debugging methods
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</li>
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</ul>
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<div class="content">
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<p><a class="target" name="fetch"><h2>Fetching a page</h2></a></p>
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<p>
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Testing classes is all very well, but PHP is predominately
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a language for creating functionality within web pages.
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How do we test the front end presentation role of our PHP
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applications?
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Well the web pages are just text, so we should be able to
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examine them just like any other test data.
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</p>
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<p>
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This leads to a tricky issue.
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If we test at too low a level, testing for matching tags
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in the page with pattern matching for example, our tests will
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be brittle.
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The slightest change in layout could break a large number of
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tests.
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If we test at too high a level, say using mock versions of a
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template engine, then we lose the ability to automate some classes
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of test.
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For example, the interaction of forms and navigation will
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have to be tested manually.
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These types of test are extremely repetitive and error prone.
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</p>
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<p>
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SimpleTest includes a special form of test case for the testing
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of web page actions.
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The <span class="new_code">WebTestCase</span> includes facilities
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for navigation, content and cookie checks and form handling.
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Usage of these test cases is similar to the
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<a href="unit_tester_documentation.html">UnitTestCase</a>...
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<pre>
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<strong>class TestOfLastcraft extends WebTestCase {
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}</strong>
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</pre>
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Here we are about to test the
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<a href="http://www.lastcraft.com/">Last Craft</a> site itself.
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If this test case is in a file called <em>lastcraft_test.php</em>
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then it can be loaded in a runner script just like unit tests...
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<pre>
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<?php
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require_once('simpletest/autorun.php');<strong>
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require_once('simpletest/web_tester.php');</strong>
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SimpleTest::prefer(new TextReporter());
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class WebTests extends TestSuite {
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function WebTests() {
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$this->TestSuite('Web site tests');<strong>
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$this->addFile('lastcraft_test.php');</strong>
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}
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}
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?>
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</pre>
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I am using the text reporter here to more clearly
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distinguish the web content from the test output.
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</p>
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<p>
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Nothing is being tested yet.
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We can fetch the home page by using the
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<span class="new_code">get()</span> method...
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<pre>
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class TestOfLastcraft extends WebTestCase {
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<strong>
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function testHomepage() {
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$this->assertTrue($this->get('http://www.lastcraft.com/'));
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}</strong>
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}
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</pre>
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The <span class="new_code">get()</span> method will
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return true only if page content was successfully
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loaded.
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It is a simple, but crude way to check that a web page
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was actually delivered by the web server.
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However that content may be a 404 response and yet
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our <span class="new_code">get()</span> method will still return true.
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</p>
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<p>
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Assuming that the web server for the Last Craft site is up
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(sadly not always the case), we should see...
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<pre class="shell">
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Web site tests
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OK
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Test cases run: 1/1, Failures: 0, Exceptions: 0
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</pre>
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All we have really checked is that any kind of page was
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returned.
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We don't yet know if it was the right one.
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</p>
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<p><a class="target" name="content"><h2>Testing page content</h2></a></p>
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<p>
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To confirm that the page we think we are on is actually the
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page we are on, we need to verify the page content.
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<pre>
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class TestOfLastcraft extends WebTestCase {
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function testHomepage() {<strong>
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$this->get('http://www.lastcraft.com/');
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$this->assertText('Why the last craft');</strong>
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}
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}
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</pre>
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The page from the last fetch is held in a buffer in
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the test case, so there is no need to refer to it directly.
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The pattern match is always made against the buffer.
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</p>
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<p>
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Here is the list of possible content assertions...
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<table><tbody>
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<tr>
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<td><span class="new_code">assertTitle($title)</span></td>
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<td>Pass if title is an exact match</td>
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</tr>
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<tr>
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<td><span class="new_code">assertText($text)</span></td>
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<td>Pass if matches visible and "alt" text</td>
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</tr>
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<tr>
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<td><span class="new_code">assertNoText($text)</span></td>
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<td>Pass if doesn't match visible and "alt" text</td>
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</tr>
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<tr>
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<td><span class="new_code">assertPattern($pattern)</span></td>
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<td>A Perl pattern match against the page content</td>
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</tr>
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<tr>
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<td><span class="new_code">assertNoPattern($pattern)</span></td>
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<td>A Perl pattern match to not find content</td>
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</tr>
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<tr>
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<td><span class="new_code">assertLink($label)</span></td>
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<td>Pass if a link with this text is present</td>
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</tr>
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<tr>
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<td><span class="new_code">assertNoLink($label)</span></td>
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<td>Pass if no link with this text is present</td>
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</tr>
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<tr>
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<td><span class="new_code">assertLinkById($id)</span></td>
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<td>Pass if a link with this id attribute is present</td>
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</tr>
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<tr>
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<td><span class="new_code">assertNoLinkById($id)</span></td>
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<td>Pass if no link with this id attribute is present</td>
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</tr>
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<tr>
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<td><span class="new_code">assertField($name, $value)</span></td>
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<td>Pass if an input tag with this name has this value</td>
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</tr>
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<tr>
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<td><span class="new_code">assertFieldById($id, $value)</span></td>
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<td>Pass if an input tag with this id has this value</td>
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</tr>
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<tr>
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<td><span class="new_code">assertResponse($codes)</span></td>
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<td>Pass if HTTP response matches this list</td>
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</tr>
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<tr>
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<td><span class="new_code">assertMime($types)</span></td>
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<td>Pass if MIME type is in this list</td>
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</tr>
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<tr>
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<td><span class="new_code">assertAuthentication($protocol)</span></td>
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<td>Pass if the current challenge is this protocol</td>
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</tr>
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<tr>
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<td><span class="new_code">assertNoAuthentication()</span></td>
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<td>Pass if there is no current challenge</td>
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</tr>
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<tr>
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<td><span class="new_code">assertRealm($name)</span></td>
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<td>Pass if the current challenge realm matches</td>
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</tr>
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<tr>
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<td><span class="new_code">assertHeader($header, $content)</span></td>
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<td>Pass if a header was fetched matching this value</td>
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</tr>
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<tr>
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<td><span class="new_code">assertNoHeader($header)</span></td>
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<td>Pass if a header was not fetched</td>
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</tr>
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<tr>
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<td><span class="new_code">assertCookie($name, $value)</span></td>
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<td>Pass if there is currently a matching cookie</td>
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</tr>
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<tr>
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<td><span class="new_code">assertNoCookie($name)</span></td>
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<td>Pass if there is currently no cookie of this name</td>
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</tr>
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</tbody></table>
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As usual with the SimpleTest assertions, they all return
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false on failure and true on pass.
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They also allow an optional test message and you can embed
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the original test message inside using "%s" inside
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your custom message.
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</p>
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<p>
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So now we could instead test against the title tag with...
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<pre>
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<strong>$this->assertTitle('The Last Craft? Web developer tutorials on PHP, Extreme programming and Object Oriented development');</strong>
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</pre>
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...or, if that is too long and fragile...
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<pre>
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<strong>$this->assertTitle(new PatternExpectation('/The Last Craft/'));</strong>
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</pre>
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As well as the simple HTML content checks we can check
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that the MIME type is in a list of allowed types with...
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<pre>
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<strong>$this->assertMime(array('text/plain', 'text/html'));</strong>
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</pre>
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More interesting is checking the HTTP response code.
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Like the MIME type, we can assert that the response code
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is in a list of allowed values...
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<pre>
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class TestOfLastcraft extends WebTestCase {
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function testRedirects() {
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$this->get('http://www.lastcraft.com/test/redirect.php');
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$this->assertResponse(200);</strong>
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}
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}
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</pre>
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Here we are checking that the fetch is successful by
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allowing only a 200 HTTP response.
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This test will pass, but it is not actually correct to do so.
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There is no page, instead the server issues a redirect.
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The <span class="new_code">WebTestCase</span> will
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automatically follow up to three such redirects.
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The tests are more robust this way and we are usually
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interested in the interaction with the pages rather
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than their delivery.
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If the redirects are of interest then this ability must
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be disabled...
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<pre>
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class TestOfLastcraft extends WebTestCase {
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function testHomepage() {<strong>
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$this->setMaximumRedirects(0);</strong>
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$this->get('http://www.lastcraft.com/test/redirect.php');
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$this->assertResponse(200);
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}
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}
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</pre>
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The assertion now fails as expected...
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<pre class="shell">
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Web site tests
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1) Expecting response in [200] got [302]
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in testhomepage
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in testoflastcraft
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in lastcraft_test.php
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FAILURES!!!
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Test cases run: 1/1, Failures: 1, Exceptions: 0
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</pre>
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We can modify the test to correctly assert redirects with...
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<pre>
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class TestOfLastcraft extends WebTestCase {
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function testHomepage() {
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$this->setMaximumRedirects(0);
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$this->get('http://www.lastcraft.com/test/redirect.php');
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$this->assertResponse(<strong>array(301, 302, 303, 307)</strong>);
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}
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}
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</pre>
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This now passes.
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</p>
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<p><a class="target" name="navigation"><h2>Navigating a web site</h2></a></p>
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<p>
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Users don't often navigate sites by typing in URLs, but by
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clicking links and buttons.
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Here we confirm that the contact details can be reached
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from the home page...
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<pre>
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class TestOfLastcraft extends WebTestCase {
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...
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function testContact() {
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$this->get('http://www.lastcraft.com/');<strong>
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$this->clickLink('About');
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$this->assertTitle(new PatternExpectation('/About Last Craft/'));</strong>
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}
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}
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</pre>
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The parameter is the text of the link.
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</p>
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<p>
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If the target is a button rather than an anchor tag, then
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<span class="new_code">clickSubmit()</span> can be used
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with the button title...
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<pre>
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<strong>$this->clickSubmit('Go!');</strong>
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</pre>
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If you are not sure or don't care, the usual case, then just
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use the <span class="new_code">click()</span> method...
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<pre>
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<strong>$this->click('Go!');</strong>
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</pre>
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</p>
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<p>
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The list of navigation methods is...
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<table><tbody>
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<tr>
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<td><span class="new_code">getUrl()</span></td>
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<td>The current location</td>
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</tr>
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<tr>
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<td><span class="new_code">get($url, $parameters)</span></td>
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<td>Send a GET request with these parameters</td>
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</tr>
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<tr>
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<td><span class="new_code">post($url, $parameters)</span></td>
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<td>Send a POST request with these parameters</td>
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</tr>
|
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|
|
<tr>
|
||
|
|
<td><span class="new_code">head($url, $parameters)</span></td>
|
||
|
|
<td>Send a HEAD request without replacing the page content</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">retry()</span></td>
|
||
|
|
<td>Reload the last request</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">back()</span></td>
|
||
|
|
<td>Like the browser back button</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">forward()</span></td>
|
||
|
|
<td>Like the browser forward button</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">authenticate($name, $password)</span></td>
|
||
|
|
<td>Retry after a challenge</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">restart()</span></td>
|
||
|
|
<td>Restarts the browser as if a new session</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">getCookie($name)</span></td>
|
||
|
|
<td>Gets the cookie value for the current context</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">ageCookies($interval)</span></td>
|
||
|
|
<td>Ages current cookies prior to a restart</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">clearFrameFocus()</span></td>
|
||
|
|
<td>Go back to treating all frames as one page</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">clickSubmit($label)</span></td>
|
||
|
|
<td>Click the first button with this label</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">clickSubmitByName($name)</span></td>
|
||
|
|
<td>Click the button with this name attribute</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">clickSubmitById($id)</span></td>
|
||
|
|
<td>Click the button with this ID attribute</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">clickImage($label, $x, $y)</span></td>
|
||
|
|
<td>Click an input tag of type image by title or alt text</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">clickImageByName($name, $x, $y)</span></td>
|
||
|
|
<td>Click an input tag of type image by name</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">clickImageById($id, $x, $y)</span></td>
|
||
|
|
<td>Click an input tag of type image by ID attribute</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">submitFormById($id)</span></td>
|
||
|
|
<td>Submit a form without the submit value</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">clickLink($label, $index)</span></td>
|
||
|
|
<td>Click an anchor by the visible label text</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">clickLinkById($id)</span></td>
|
||
|
|
<td>Click an anchor by the ID attribute</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">getFrameFocus()</span></td>
|
||
|
|
<td>The name of the currently selected frame</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">setFrameFocusByIndex($choice)</span></td>
|
||
|
|
<td>Focus on a frame counting from 1</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">setFrameFocus($name)</span></td>
|
||
|
|
<td>Focus on a frame by name</td>
|
||
|
|
</tr>
|
||
|
|
</tbody></table>
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
The parameters in the <span class="new_code">get()</span>, <span class="new_code">post()</span> or
|
||
|
|
<span class="new_code">head()</span> methods are optional.
|
||
|
|
The HTTP HEAD fetch does not change the browser context, only loads
|
||
|
|
cookies.
|
||
|
|
This can be useful for when an image or stylesheet sets a cookie
|
||
|
|
for crafty robot blocking.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
The <span class="new_code">retry()</span>, <span class="new_code">back()</span> and
|
||
|
|
<span class="new_code">forward()</span> commands work as they would on
|
||
|
|
your web browser.
|
||
|
|
They use the history to retry pages.
|
||
|
|
This can be handy for checking the effect of hitting the
|
||
|
|
back button on your forms.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
The frame methods need a little explanation.
|
||
|
|
By default a framed page is treated just like any other.
|
||
|
|
Content will be searced for throughout the entire frameset,
|
||
|
|
so clicking a link will work no matter which frame
|
||
|
|
the anchor tag is in.
|
||
|
|
You can override this behaviour by focusing on a single
|
||
|
|
frame.
|
||
|
|
If you do that, all searches and actions will apply to that
|
||
|
|
frame alone, such as authentication and retries.
|
||
|
|
If a link or button is not in a focused frame then it cannot
|
||
|
|
be clicked.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
Testing navigation on fixed pages only tells you when you
|
||
|
|
have broken an entire script.
|
||
|
|
For highly dynamic pages, such as for bulletin boards, this can
|
||
|
|
be crucial for verifying the correctness of the application.
|
||
|
|
For most applications though, the really tricky logic is usually in
|
||
|
|
the handling of forms and sessions.
|
||
|
|
Fortunately SimpleTest includes
|
||
|
|
<a href="form_testing_documentation.html">tools for testing web forms</a>
|
||
|
|
as well.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p><a class="target" name="request"><h2>Modifying the request</h2></a></p>
|
||
|
|
<p>
|
||
|
|
Although SimpleTest does not have the goal of testing networking
|
||
|
|
problems, it does include some methods to modify and debug
|
||
|
|
the requests it makes.
|
||
|
|
Here is another method list...
|
||
|
|
<table><tbody>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">getTransportError()</span></td>
|
||
|
|
<td>The last socket error</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">showRequest()</span></td>
|
||
|
|
<td>Dump the outgoing request</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">showHeaders()</span></td>
|
||
|
|
<td>Dump the incoming headers</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">showSource()</span></td>
|
||
|
|
<td>Dump the raw HTML page content</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">ignoreFrames()</span></td>
|
||
|
|
<td>Do not load framesets</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">setCookie($name, $value)</span></td>
|
||
|
|
<td>Set a cookie from now on</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">addHeader($header)</span></td>
|
||
|
|
<td>Always add this header to the request</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">setMaximumRedirects($max)</span></td>
|
||
|
|
<td>Stop after this many redirects</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">setConnectionTimeout($timeout)</span></td>
|
||
|
|
<td>Kill the connection after this time between bytes</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><span class="new_code">useProxy($proxy, $name, $password)</span></td>
|
||
|
|
<td>Make requests via this proxy URL</td>
|
||
|
|
</tr>
|
||
|
|
</tbody></table>
|
||
|
|
These methods are principally for debugging.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
References and related information...
|
||
|
|
<ul>
|
||
|
|
<li>
|
||
|
|
SimpleTest project page on <a href="http://sourceforge.net/projects/simpletest/">SourceForge</a>.
|
||
|
|
</li>
|
||
|
|
<li>
|
||
|
|
SimpleTest download page on <a href="http://www.lastcraft.com/simple_test.php">LastCraft</a>.
|
||
|
|
</li>
|
||
|
|
<li>
|
||
|
|
The <a href="http://simpletest.org/api/">developer's API for SimpleTest</a>
|
||
|
|
gives full detail on the classes and assertions available.
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<div class="menu_back"><div class="menu">
|
||
|
|
<a href="index.html">SimpleTest</a>
|
||
|
|
|
|
||
|
|
<a href="overview.html">Overview</a>
|
||
|
|
|
|
||
|
|
<a href="unit_test_documentation.html">Unit tester</a>
|
||
|
|
|
|
||
|
|
<a href="group_test_documentation.html">Group tests</a>
|
||
|
|
|
|
||
|
|
<a href="mock_objects_documentation.html">Mock objects</a>
|
||
|
|
|
|
||
|
|
<a href="partial_mocks_documentation.html">Partial mocks</a>
|
||
|
|
|
|
||
|
|
<a href="reporter_documentation.html">Reporting</a>
|
||
|
|
|
|
||
|
|
<a href="expectation_documentation.html">Expectations</a>
|
||
|
|
|
|
||
|
|
<span class="chosen">Web tester</span>
|
||
|
|
|
|
||
|
|
<a href="form_testing_documentation.html">Testing forms</a>
|
||
|
|
|
|
||
|
|
<a href="authentication_documentation.html">Authentication</a>
|
||
|
|
|
|
||
|
|
<a href="browser_documentation.html">Scriptable browser</a>
|
||
|
|
</div></div>
|
||
|
|
<div class="copyright">
|
||
|
|
Copyright<br>Marcus Baker 2006
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|