more.pm

关于Berkelay数据库的共享源码

    }

=cut

sub can_ok ($@) {
    my($proto, @methods) = @_;
    my $class = ref $proto || $proto;

    unless( @methods ) {
        my $ok = $Test->ok( 0, "$class->can(...)" );
        $Test->diag('    can_ok() called with no methods');
        return $ok;
    }

    my @nok = ();
    foreach my $method (@methods) {
        local($!, $@);  # don't interfere with caller's $@
                        # eval sometimes resets $!
        eval { $proto->can($method) } || push @nok, $method;
    }

    my $name;
    $name = @methods == 1 ? "$class->can('$methods[0]')" 
                          : "$class->can(...)";
    
    my $ok = $Test->ok( !@nok, $name );

    $Test->diag(map "    $class->can('$_') failed\n", @nok);

    return $ok;
}

=item B<isa_ok>

  isa_ok($object, $class, $object_name);
  isa_ok($ref,    $type,  $ref_name);

Checks to see if the given C<< $object->isa($class) >>.  Also checks to make
sure the object was defined in the first place.  Handy for this sort
of thing:

    my $obj = Some::Module->new;
    isa_ok( $obj, 'Some::Module' );

where you'd otherwise have to write

    my $obj = Some::Module->new;
    ok( defined $obj && $obj->isa('Some::Module') );

to safeguard against your test script blowing up.

It works on references, too:

    isa_ok( $array_ref, 'ARRAY' );

The diagnostics of this test normally just refer to 'the object'.  If
you'd like them to be more specific, you can supply an $object_name
(for example 'Test customer').

=cut

sub isa_ok ($$;$) {
    my($object, $class, $obj_name) = @_;

    my $diag;
    $obj_name = 'The object' unless defined $obj_name;
    my $name = "$obj_name isa $class";
    if( !defined $object ) {
        $diag = "$obj_name isn't defined";
    }
    elsif( !ref $object ) {
        $diag = "$obj_name isn't a reference";
    }
    else {
        # We can't use UNIVERSAL::isa because we want to honor isa() overrides
        local($@, $!);  # eval sometimes resets $!
        my $rslt = eval { $object->isa($class) };
        if( $@ ) {
            if( $@ =~ /^Can't call method "isa" on unblessed reference/ ) {
                if( !UNIVERSAL::isa($object, $class) ) {
                    my $ref = ref $object;
                    $diag = "$obj_name isn't a '$class' it's a '$ref'";
                }
            } else {
                die <<WHOA;
WHOA! I tried to call ->isa on your object and got some weird error.
This should never happen.  Please contact the author immediately.
Here's the error.
$@
WHOA
            }
        }
        elsif( !$rslt ) {
            my $ref = ref $object;
            $diag = "$obj_name isn't a '$class' it's a '$ref'";
        }
    }
            
      

    my $ok;
    if( $diag ) {
        $ok = $Test->ok( 0, $name );
        $Test->diag("    $diag\n");
    }
    else {
        $ok = $Test->ok( 1, $name );
    }

    return $ok;
}


=item B<pass>

=item B<fail>

  pass($test_name);
  fail($test_name);

Sometimes you just want to say that the tests have passed.  Usually
the case is you've got some complicated condition that is difficult to
wedge into an ok().  In this case, you can simply use pass() (to
declare the test ok) or fail (for not ok).  They are synonyms for
ok(1) and ok(0).

Use these very, very, very sparingly.

=cut

sub pass (;$) {
    $Test->ok(1, @_);
}

sub fail (;$) {
    $Test->ok(0, @_);
}

=back

=head2 Diagnostics

If you pick the right test function, you'll usually get a good idea of
what went wrong when it failed.  But sometimes it doesn't work out
that way.  So here we have ways for you to write your own diagnostic
messages which are safer than just C<print STDERR>.

=over 4

=item B<diag>

  diag(@diagnostic_message);

Prints a diagnostic message which is guaranteed not to interfere with
test output.  Like C<print> @diagnostic_message is simply concatinated
together.

Handy for this sort of thing:

    ok( grep(/foo/, @users), "There's a foo user" ) or
        diag("Since there's no foo, check that /etc/bar is set up right");

which would produce:

    not ok 42 - There's a foo user
    #     Failed test (foo.t at line 52)
    # Since there's no foo, check that /etc/bar is set up right.

You might remember C<ok() or diag()> with the mnemonic C<open() or
die()>.

All diag()s can be made silent by passing the "no_diag" option to
Test::More.  C<use Test::More tests => 1, 'no_diag'>.  This is useful
if you have diagnostics for personal testing but then wish to make
them silent for release without commenting out each individual
statement.

B<NOTE> The exact formatting of the diagnostic output is still
changing, but it is guaranteed that whatever you throw at it it won't
interfere with the test.

=cut

sub diag {
    return unless $Show_Diag;
    $Test->diag(@_);
}


=back

=head2 Module tests

You usually want to test if the module you're testing loads ok, rather
than just vomiting if its load fails.  For such purposes we have
C<use_ok> and C<require_ok>.

=over 4

=item B<use_ok>

   BEGIN { use_ok($module); }
   BEGIN { use_ok($module, @imports); }

These simply use the given $module and test to make sure the load
happened ok.  It's recommended that you run use_ok() inside a BEGIN
block so its functions are exported at compile-time and prototypes are
properly honored.

If @imports are given, they are passed through to the use.  So this:

   BEGIN { use_ok('Some::Module', qw(foo bar)) }

is like doing this:

   use Some::Module qw(foo bar);

Version numbers can be checked like so:

   # Just like "use Some::Module 1.02"
   BEGIN { use_ok('Some::Module', 1.02) }

Don't try to do this:

   BEGIN {
       use_ok('Some::Module');

       ...some code that depends on the use...
       ...happening at compile time...
   }

because the notion of "compile-time" is relative.  Instead, you want:

  BEGIN { use_ok('Some::Module') }
  BEGIN { ...some code that depends on the use... }


=cut

sub use_ok ($;@) {
    my($module, @imports) = @_;
    @imports = () unless @imports;

    my($pack,$filename,$line) = caller;

    local($@,$!);   # eval sometimes interferes with $!

    if( @imports == 1 and $imports[0] =~ /^\d+(?:\.\d+)?$/ ) {
        # probably a version check.  Perl needs to see the bare number
        # for it to work with non-Exporter based modules.
        eval <<USE;
package $pack;
use $module $imports[0];
USE
    }
    else {
        eval <<USE;
package $pack;
use $module \@imports;
USE
    }

    my $ok = $Test->ok( !$@, "use $module;" );

    unless( $ok ) {
        chomp $@;
        $@ =~ s{^BEGIN failed--compilation aborted at .*$}
                {BEGIN failed--compilation aborted at $filename line $line.}m;
        $Test->diag(<<DIAGNOSTIC);
    Tried to use '$module'.
    Error:  $@
DIAGNOSTIC

    }

    return $ok;
}

=item B<require_ok>

   require_ok($module);
   require_ok($file);

Like use_ok(), except it requires the $module or $file.

=cut

sub require_ok ($) {
    my($module) = shift;

    my $pack = caller;

    # Try to deterine if we've been given a module name or file.
    # Module names must be barewords, files not.
    $module = qq['$module'] unless _is_module_name($module);

    local($!, $@); # eval sometimes interferes with $!
    eval <<REQUIRE;
package $pack;
require $module;
REQUIRE

    my $ok = $Test->ok( !$@, "require $module;" );

    unless( $ok ) {
        chomp $@;
        $Test->diag(<<DIAGNOSTIC);
    Tried to require '$module'.
    Error:  $@
DIAGNOSTIC

    }

    return $ok;
}


sub _is_module_name {
    my $module = shift;

    # Module names start with a letter.
    # End with an alphanumeric.
    # The rest is an alphanumeric or ::
    $module =~ s/\b::\b//g;
    $module =~ /^[a-zA-Z]\w+$/;
}

=back

=head2 Conditional tests

Sometimes running a test under certain conditions will cause the
test script to die.  A certain function or method isn't implemented
(such as fork() on MacOS), some resource isn't available (like a 
net connection) or a module isn't available.  In these cases it's
necessary to skip tests, or declare that they are supposed to fail
but will work in the future (a todo test).

For more details on the mechanics of skip and todo tests see
L<Test::Harness>.

The way Test::More handles this is with a named block.  Basically, a
block of tests which can be skipped over or made todo.  It's best if I
just show you...

=over 4

=item B<SKIP: BLOCK>

  SKIP: {
      skip $why, $how_many if $condition;

      ...normal testing code goes here...
  }

This declares a block of tests that might be skipped, $how_many tests
there are, $why and under what $condition to skip them.  An example is
the easiest way to illustrate:

    SKIP: {
        eval { require HTML::Lint };

        skip "HTML::Lint not installed", 2 if $@;

        my $lint = new HTML::Lint;
        isa_ok( $lint, "HTML::Lint" );

        $lint->parse( $html );
        is( $lint->errors, 0, "No errors found in HTML" );
    }

If the user does not have HTML::Lint installed, the whole block of
code I<won't be run at all>.  Test::More will output special ok's
which Test::Harness interprets as skipped, but passing, tests.

It's important that $how_many accurately reflects the number of tests
in the SKIP block so the # of tests run will match up with your plan.
If your plan is C<no_plan> $how_many is optional and will default to 1.

It's perfectly safe to nest SKIP blocks.  Each SKIP block must have
the label C<SKIP>, or Test::More can't work its magic.

You don't skip tests which are failing because there's a bug in your
program, or for which you don't yet have code written.  For that you
use TODO.  Read on.

=cut

#'#
sub skip {
    my($why, $how_many) = @_;

    unless( defined $how_many ) {
        # $how_many can only be avoided when no_plan is in use.
        _carp "skip() needs to know \$how_many tests are in the block"
          unless $Test->has_plan eq 'no_plan';
        $how_many = 1;
    }

    for( 1..$how_many ) {
        $Test->skip($why);
    }

    local $^W = 0;
    last SKIP;
}


=item B<TODO: BLOCK>

    TODO: {
        local $TODO = $why if $condition;

        ...normal testing code goes here...
    }

Declares a block of tests you expect to fail and $why.  Perhaps it's
because you haven't fixed a bug or haven't finished a new feature:

    TODO: {
        local $TODO = "URI::Geller not finished";

        my $card = "Eight of clubs";
        is( URI::Geller->your_card, $card, 'Is THIS your card?' );

        my $spoon;
        URI::Geller->bend_spoon;
        is( $spoon, 'bent',    "Spoon bending, that's original" );
    }

With a todo block, the tests inside are expected to fail.  Test::More
will run the tests normally, but print out special flags indicating
they are "todo".  Test::Harness will interpret failures as being ok.
Should anything succeed, it will report it as an unexpected success.
You then know the thing you had todo is done and can remove the
TODO flag.

The nice part about todo tests, as opposed to simply commenting out a
block of tests, is it's like having a programmatic todo list.  You know
how much work is left to be done, you're aware of what bugs there are,
and you'll know immediately when they're fixed.

Once a todo test starts succeeding, simply move it outside the block.
When the block is empty, delete it.

B<NOTE>: TODO tests require a Test::Harness upgrade else it will
treat it as a normal failure.  See L<BUGS and CAVEATS>)


=item B<todo_skip>

    TODO: {
        todo_skip $why, $how_many if $condition;

        ...normal testing code...
    }

With todo tests, it's best to have the tests actually run.  That way
you'll know when they start passing.  Sometimes this isn't possible.
Often a failing test will cause the whole program to die or hang, even
inside an C<eval BLOCK> with and using C<alarm>.  In these extreme
cases you have no choice but to skip over the broken tests entirely.

The syntax and behavior is similar to a C<SKIP: BLOCK> except the
tests will be marked as failing but todo.  Test::Harness will
interpret them as passing.

=cut

sub todo_skip {
    my($why, $how_many) = @_;

    unless( defined $how_many ) {
        # $how_many can only be avoided when no_plan is in use.
        _carp "todo_skip() needs to know \$how_many tests are in the block"
          unless $Test->has_plan eq 'no_plan';
        $how_many = 1;
    }

    for( 1..$how_many ) {
        $Test->todo_skip($why);
    }