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Obviously, this application doesn t actually do anything, but it s a starting point. Now we can use this to build a self-contained test script: #!/usr/bin/perl use warnings; use strict; use Test::More tests => 1; { package MyTestApp; use parent qw/Catalyst/; __PACKAGE__->setup(); } This minimal application is only really useful to test internal methods (e.g., to check the integrity of MyTestApp->config). The application has no controllers and no way of making a request so, for example, ok($req->is_success, "request succeeds") will fail as there is no default method and in fact no Catalyst::Controllers in the application at all. For a really simple application, we can do the following: #!/usr/bin/perl use warnings; use strict; use Test::More tests => 3; { package MyTestApp; use parent qw/Catalyst/; use parent qw/Catalyst::Controller/; __PACKAGE__->setup(); sub default :Path { my ($self, $c) = @_; $c->res->body('default action'); } } use_ok "Catalyst::Test", "MyTestApp"; my $req = request('/'); ok($req->is_success, 'request succeeds'); is($req->content, "default action", "expected content"); Eventually, declaring our application inline with the tests will become cumbersome, and we ll want the test application elsewhere. At this point, we can move our application into a lib directory and give it the name MyTestApp.pm. We place the code for our minimal application in that file, remembering the line of code at the end that just says 1; and replacing the inline application with the following code:

Note This solution assumes that there is only one training department. You could also use NOT IN instead of <>.

You might choose to create a database shell from an existing template in which data fields are already defined, or to create a generic, blank database with no field definitions. The Legal tab of the Create database from template dialog has two items that correspond to a Litigation Document Production database shell, and to a Transcripts shell. For the purposes of a discovery process relating to a legal matter, the Litigation Document Production shell contains many useful fields. These fields may be modified as research progresses and needs evolve. Highlighting the Litigation Document Production item and then clicking the OK button opens a Save As dialog, prompting you to specify a folder that contains the Concordance database files. In this example, the chosen database name is EX01.DCB. You enter the desired database name in the File name text field (see Figure 4-2). Clicking the Save button creates an empty Concordance database with a series of useful predefined fields. To view these fields, use the File Modify menu item to open a Modify dialog box that displays all fields in the database (see Figure 4-3). This is a viable, albeit empty, Concordance database. It must be loaded from an external data file. Although Concordance is compatible with a variety of data formats, for the purposes of this example, a delimited text file will be used.

8. List the numbers of all employees who did not attend the Java course. Solution 4-8a. Correct Solution SQL> select empno 2 from employees 3 where empno not in (select attendee 4 from registrations 5 where course = 'JAV'); EMPNO -------7369 7521 7654 7844 7900 7902 7934 SQL>

use FindBin qw/$Bin/; use lib "$Bin/lib"; FindBin locates the directory of the currently running script (sample.t in this case) and exposes it through the $Bin variable, as instructed. At this point, we have all the tools we need to write tiny test cases. As you can see, it s pretty straightforward to write your own Catalyst code for a test application or use the catalyst.pl and myapp_create.pl helper scripts to do the scaffolding for you. Writing a minimal test case, along with use of the debugger (see 3), or using Devel::REPL can assist you in identifying bugs in your code and help improve your understanding of your application s implementation in a quick and efficient manner.

Figure 4-2. The folder has been created in advance of the database, and named EX01 for easy recognition.