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<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:18.0pt;margin-left:0cm">
<b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">Trace Tables</span></b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif"> (adapted from the
<a href="http://www.bbc.co.uk/education/guides/z8n3d2p/revision/8">BBC</a>)<o:p></o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">When testing software, it is sometimes necessary to test a number of conditions and sub-conditions at the same time.<o:p></o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">A
<b>trace table</b> can be used to record the outcomes of the test. <o:p></o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">The trace table for a very simple example, such as x=y+2, would look like this:<o:p></o:p></span></p>
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<p style="margin:0cm;margin-bottom:.0001pt"><b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">y</span></b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p style="margin:0cm;margin-bottom:.0001pt"><b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">x</span></b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<td width="64" valign="top" style="width:48.0pt;border:solid #A3A3A3 1.0pt;border-top:none;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">13<o:p></o:p></span></p>
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<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">15<o:p></o:p></span></p>
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<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">25<o:p></o:p></span></p>
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<td width="53" valign="top" style="width:39.9pt;border-top:none;border-left:none;border-bottom:solid #A3A3A3 1.0pt;border-right:solid #A3A3A3 1.0pt;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">27<o:p></o:p></span></p>
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<td width="64" valign="top" style="width:48.0pt;border:solid #A3A3A3 1.0pt;border-top:none;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">1200<o:p></o:p></span></p>
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<td width="53" valign="top" style="width:39.9pt;border-top:none;border-left:none;border-bottom:solid #A3A3A3 1.0pt;border-right:solid #A3A3A3 1.0pt;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">1202<o:p></o:p></span></p>
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<p style="margin:0cm;margin-bottom:.0001pt"><b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">Test data
</span></b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">Specifically designed to find weaknesses in code. Test data should act as the ultimate stress test to show up every possible code fault.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:18.0pt;margin-left:0cm">
<span style="font-size:10.5pt;font-family:"Calibri",sans-serif">Test data should <b>include every conceivable type of input</b>, and focus on data that will most rigorously test the points where errors are most likely to occur. Especially
<i>boundary conditions</i> or ‘tipping points’.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:18.0pt;margin-left:0cm">
<span style="font-size:10.5pt;font-family:"Calibri",sans-serif">Test data should also be
<b>as brief as possible </b>(except when load testing)<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:18.0pt;margin-left:0cm">
<b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">Hint</span></b><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">: most logical errors in real life programming, and especially in exam questions, occur on boundaries. Be on the
lookout for code with a statement like </span><span style="font-size:10.5pt;font-family:"Courier New"">IF x < y THEN…</span><span style="font-size:10.5pt;font-family:"Calibri",sans-serif"> because often the error is that < should have been <= . </span><span style="font-size:10.5pt"><o:p></o:p></span></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:18.0pt;margin-left:0cm">
<span style="font-size:10.5pt;font-family:"Calibri",sans-serif">Comprehensive test data includes
<b>invalid inputs</b> to test validation code, <b>valid inputs</b> and inputs that are
<b>valid but unusual</b> or unexpected.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;font-family:"Verdana",sans-serif;color:#1F4E79;mso-fareast-language:EN-AU">Kushum Rattan
<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;font-family:"Verdana",sans-serif;color:#1F4E79;mso-fareast-language:EN-AU">ICT Curriculum Area Leader
<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;font-family:"Verdana",sans-serif;color:#1F4E79;mso-fareast-language:EN-AU">VET Co-ordinator<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;font-family:"Verdana",sans-serif;color:#1F4E79;mso-fareast-language:EN-AU">Gisborne Secondary College<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;font-family:"Verdana",sans-serif;color:#1F4E79;mso-fareast-language:EN-AU">Phone: 03 54283691<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;font-family:"Verdana",sans-serif;color:#1F4E79;mso-fareast-language:EN-AU"><a href="mailto:rattan.kushum.l@edumail.vic.gov.au">rattan.kushum.l@edumail.vic.gov.au</a><o:p></o:p></span></i></p>
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