Software Development Cross Solution - Index of - Free

first fail
Red: write (failing) tests
The first step is to write a test. The user story says we need to process
and store order information, so let’s assume we’ll need a new class for
that, called OrderProcessor:
import org.junit.*;
public class TestOrderProcessor {
@Test
public void testCreateOrderProcessor() {
OrderProcessor orderProcessor = new OrderProcessor();
}
}
As you would expect, this test will fail—
you don’t have an OrderProcessor
yet. So now you can fix that pretty easily.
Green: write code to pass tests
To get your first test to pass, just add an empty OrderProcessor class:
public class OrderProcessor {
}
That’s it. Recompile, retest, and you’re
back to green. The user story says
you need to process and store order
information. You’ve already got classes
that represent order information (and
a receipt), so use those now along with
the OrderProcessor class that you
just created.
290 Chapter 8
This test doesn’t even
compile, let alone pass.
File Edit Window Help Failure
There’s nothing special
about the name
OrderProcessor. It’s
just a place to put
business logic, since
the only other classes
in the app are for
storing data.
hfsd> javac -cp junit.jar
headfirst.sd.chapter8.TestOrderProcessor.java
TestOrderProcessor.java:8: cannot find symbol
symbol : class OrderProcessor
location: class headfirst.sd.chapter8.TestOrderProcessor
OrderProcessor orderProcessor = new OrderProcessor();
^
TestOrderProcessor.java:8: cannot find symbol
symbol : class OrderProcessor
location: class headfirst.sd.chapter8.TestOrderProcessor
OrderProcessor orderProcessor = new OrderProcessor();
^
2 errors
hfsd>
File Edit Window Help Success
hfsd> javac -d bin -cp junit.jar *.java
Green: test compiles
and passes.
hfsd> java -cp junit.jar;.\bin org.junit.runner.
JUnitCore headfirst.sd.chapter8.TestOrderProcessor
JUnit version 4.4
Time: 0.018
OK (1 test)
hfsd>
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