bug 2284: ModMember can erase the dateofbirth field

patch to C4::Members::ModMember to prevent it from deleting the dateofbirth field when none is supplied.

I also added a KohaTest::random_date method to help generate randomish dates for the test suite.
Added some tests for Member::ModMember. This is an easy method to test, and this bug shows that it
could use some closer examiniation.

Signed-off-by: Joshua Ferraro <jmf@liblime.com>

C4/Members.pm

@@ -624,7 +624,7 @@ sub ModMember {
         }
     }
     if (!$data{'dateofbirth'}){
-        undef $data{'dateofbirth'};
+        delete $data{'dateofbirth'};
     }
     my $qborrower=$dbh->prepare("SHOW columns from borrowers");
     $qborrower->execute;

t/lib/KohaTest.pm

@@ -329,6 +329,7 @@ sub startup_24_add_member : Test(startup => 1) {
                        categorycode => 'PT',  # PT  => PaTron
                        dateexpiry   => '2010-01-01',
                        password     => 'testpassword',
+                       dateofbirth  => $self->random_date(),
                   };
 
     my $borrowernumber = AddMember( %$memberinfo );
@@ -456,6 +457,23 @@ sub random_ip {
     
 }
 
+=head3 random_date
+
+returns a somewhat random date in the iso (yyyy-mm-dd) format.
+
+=cut
+
+sub random_date {
+    my $self = shift;
+
+    my $year  = 1800 + int( rand(300) );    # 1800 - 2199
+    my $month = 1 + int( rand(12) );        # 1 - 12
+    my $day   = 1 + int( rand(28) );        # 1 - 28
+                                            # stop at the 28th to keep us from generating February 31st and such.
+
+    return sprintf( '%04d-%02d-%02d', $year, $month, $day );
+
+}
 
 =head3 add_biblios
 

t/lib/KohaTest/Members/ModMember.pm

@@ -0,0 +1,103 @@
+package KohaTest::Members::ModMember;
+use base qw( KohaTest::Members );
+
+use strict;
+use warnings;
+
+use Test::More;
+
+use C4::Members;
+sub testing_class { 'C4::Members' };
+
+
+sub a_simple_usage : Test( 7 ) {
+    my $self = shift;
+
+    ok( $self->{'memberid'}, 'we have a valid memberid to test with' );
+
+    my $details = C4::Members::GetMemberDetails( $self->{'memberid'} );
+    ok( exists $details->{'dateofbirth'}, 'member details has a "dateofbirth" attribute');
+    ok( $details->{'dateofbirth'},        '...and it is set to something' );
+
+    my $new_date_of_birth = $self->random_date();
+    like( $new_date_of_birth, qr(^\d\d\d\d-\d\d-\d\d$), 'The new date of birth is a yyyy-mm-dd' );
+
+    my $success = C4::Members::ModMember(
+        borrowernumber => $self->{'memberid'},
+        dateofbirth    => $new_date_of_birth
+    );
+
+    ok( $success, 'we successfully called ModMember' );
+
+    $details = C4::Members::GetMemberDetails( $self->{'memberid'} );
+    ok( exists $details->{'dateofbirth'},              'member details still has a "dateofbirth" attribute');
+    is( $details->{'dateofbirth'}, $new_date_of_birth, '...and it is set to the new_date_of_birth' );
+
+}
+
+sub incorrect_usage : Test( 1 ) {
+    my $self = shift;
+
+    local $TODO = 'ModMember does not fail gracefully yet';
+    
+    my $result = C4::Members::ModMember();
+    ok( ! defined $result, 'ModMember returns false when passed no parameters' );
+
+}
+
+=head2 preserve_dates
+
+In bug 2284, it was determined that a Member's dateofbirth could be
+erased by a call to ModMember if no date_of_birth was passed in. Three
+date fields (dateofbirth, dateexpiry ,and dateenrolled) are treated
+differently than other fields by ModMember. This test method calls
+ModMember with none of the date fields set to ensure that they are not
+overwritten.
+
+=cut
+
+
+sub preserve_dates : Test( 18 ) {
+    my $self = shift;
+
+    ok( $self->{'memberid'}, 'we have a valid memberid to test with' );
+
+    my %date_fields = (
+        dateofbirth  => $self->random_date(),
+        dateexpiry   => $self->random_date(),
+        dateenrolled => $self->random_date(),
+    );
+
+    # stage our member with valid dates in all of the date fields
+    my $success = C4::Members::ModMember(
+        borrowernumber => $self->{'memberid'},
+        %date_fields,
+    );
+    ok( $success, 'succefully set the date fields.' );
+    
+    # make sure that we successfully set the date fields. They're not undef.
+    my $details = C4::Members::GetMemberDetails( $self->{'memberid'} );
+    foreach my $date_field ( keys %date_fields ) {
+        ok( exists $details->{$date_field},                     qq(member details has a "$date_field" attribute) );
+        ok( $details->{$date_field},                            '...and it is set to something true' );
+        is( $details->{$date_field}, $date_fields{$date_field}, '...and it is set to what we set it' );
+    }
+
+    # call ModMember to update the firstname. Notice that we're not
+    # updating any date fields.
+    $success = C4::Members::ModMember(
+        borrowernumber => $self->{'memberid'},
+        firstname      => $self->random_string,
+    );
+    ok( $success, 'we successfully called ModMember' );
+
+    # make sure that none of the date fields have been molested by our call to ModMember.
+    $details = C4::Members::GetMemberDetails( $self->{'memberid'} );
+    foreach my $date_field ( keys %date_fields ) {
+        ok( exists $details->{$date_field}, qq(member details still has a "$date_field" attribute) );
+        is( $details->{$date_field}, $date_fields{$date_field}, '...and it is set to the expected value' );
+    }
+
+}
+
+1;