Adding the Programmer Test


All right, the plan is to add a test to TestTextModel, at least if it doesn t look too hard. Take another look at that class earlier in the Test Text Model section. Check out that ControlTwo test right there at the bottom. We need a test like that, except that it tests ControlS. Let s write it; it doesn t look too hard.

 [Test] public void ControlS() { 
model.Lines = new ArrayList(new String[0]);
model.ControlS();
AssertEquals("<sect1><title></title>", model.Lines[0]);
AssertEquals("</sect1>", model.Lines[1]);
}
Lesson  

Are you wondering why, with a perfectly good customer test, I m going to write a programmer test? I try to do it as a matter of discipline and good practice. On a real Extreme Programming project, the Customer Acceptance Tests would belong to the customer, and they might not come along in quite as timely a way as this one did. And as a programmer, my main responsibility is the Programmer Unit Tests. In addition, it s not common that customer tests are quite so well- targeted as this one. Usually when a customer test fails, there s some debugging to do. Adding all this up, when I find myself thinking that maybe I don t need a test, I try always to go ahead and write one anyway. It pays off more often than not.

Compiling, I find that TextModel has no ControlS method. No surprise. Let s write that; it ll be a lot like the Enter method or InsertParagraghTag, as I think it s called. Those methods look like this:

 public void Enter() { 
InsertParagraphTag();
}
public void InsertParagraphTag() {
if ( lines.Count == 0 ) {
lines.Add( "<P></P>" );
selectionStart = 3;
return;
}
lines.InsertRange(LineContainingCursor()+1, NewParagraph());
// set cursor location
selectionStart = NewSelectionStart(LineContainingCursor() + 2);
}

I m going to begin in sb fake it before you make it mode and just add the lines directly, as we do in the first part of the method above. I expect this to be enough to make this test run, and I expect it to lead to some discoveries in the code. Here s my first cut at the new methods:

 public void ControlS() { 
InsertSectionTags();
}
public void InsertSectionTags() {
if ( lines.Count == 0 ) {
lines.Add( "<sect1><title></title>" );
lines.Add( "</sect1>");
selectionStart = 14;
return;
}

The code compiles, and both tests run, the new programmer test and the first customer test. It s time for a break! I ll see you after lunch !




Extreme Programming Adventures in C#
Javaв„ў EE 5 Tutorial, The (3rd Edition)
ISBN: 735619492
EAN: 2147483647
Year: 2006
Pages: 291

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