# Unit testing for Class::Inspector

# Do all the tests on ourself, where possible, as we know we will be loaded.

use strict;
use warnings;
use Test::More tests => 54;
use Class::Inspector ();

# To make maintaining this a little faster,
# CI is defined as Class::Inspector, and
# BAD for a class we know doesn't exist.
use constant CI  => 'Class::Inspector';
use constant BAD => 'Class::Inspector::Nonexistant';

# How many functions and public methods are there in Class::Inspector
my $base_functions = 18;
my $base_public    = 12;
my $base_private   = $base_functions - $base_public;





#####################################################################
# Begin Tests

# Check the good/bad class code
ok(   CI->_class( CI ),              'Class validator works for known valid' );
ok(   CI->_class( BAD ),             'Class validator works for correctly formatted, but not installed' );
ok(   CI->_class( 'A::B::C::D::E' ), 'Class validator works for long classes' );
ok(   CI->_class( '::' ),            'Class validator allows main' );
ok(   CI->_class( '::Blah' ),        'Class validator works for main aliased' );
ok( ! CI->_class(),                  'Class validator failed for missing class' );
ok( ! CI->_class( '4teen' ),         'Class validator fails for number starting class' );
ok( ! CI->_class( 'Blah::%f' ),      'Class validator catches bad characters' );






# Check the loaded method
ok(   CI->loaded( CI ), "->loaded detects loaded" );
ok( ! CI->loaded( BAD ), "->loaded detects not loaded" );





# Check the file name methods
my $filename = CI->filename( CI );
ok( $filename eq File::Spec->catfile( "Class", "Inspector.pm" ), "->filename works correctly" );
my $inc_filename = CI->_inc_filename( CI );
ok( $inc_filename eq "Class/Inspector.pm", "->_inc_filename works correctly" );
ok( index( CI->loaded_filename(CI), $filename ) >= 0, "->loaded_filename works" );
ok( ($filename eq $inc_filename or index( CI->loaded_filename(CI), $inc_filename ) == -1), "->loaded_filename works" );
ok( index( CI->resolved_filename(CI), $filename ) >= 0, "->resolved_filename works" );
ok( ($filename eq $inc_filename or index( CI->resolved_filename(CI), $inc_filename ) == -1), "->resolved_filename works" );





# Check the installed stuff
ok( CI->installed( CI ), "->installed detects installed" );
ok( ! CI->installed( BAD ), "->installed detects not installed" )
  || do {
    diag "\@INC=$_" for @INC;
    diag "$_=$INC{$_}" for sort keys %INC;
  };





# Check the functions
my $functions = CI->functions( CI );
ok( (ref($functions) eq 'ARRAY'
  and $functions->[0] eq '_class'
  and scalar @$functions == $base_functions),
  "->functions works correctly" );
ok( ! CI->functions( BAD ), "->functions fails correctly" );





# Check function refs
$functions = CI->function_refs( CI );
ok( (ref($functions) eq 'ARRAY'
  and ref $functions->[0]
  and ref($functions->[0]) eq 'CODE'
  and scalar @$functions == $base_functions),
  "->function_refs works correctly" );
ok( ! CI->functions( BAD ), "->function_refs fails correctly" );





# Check function_exists
ok( CI->function_exists( CI, 'installed' ),
  "->function_exists detects function that exists" );
ok( ! CI->function_exists( CI, 'nsfladf' ),
  "->function_exists fails for bad function" );
ok( ! CI->function_exists( CI ),
  "->function_exists fails for missing function" );
ok( ! CI->function_exists( BAD, 'function' ),
  "->function_exists fails for bad class" );





# Check the methods method.
# First, defined a new subclass of Class::Inspector with some additional methods
CLASS: {
  package Class::Inspector::Dummy;

  use strict;
  BEGIN {
    require Class::Inspector;
    @Class::Inspector::Dummy::ISA = 'Class::Inspector';
  }

  sub _a_first { 1; }
  sub adummy1 { 1; }
  sub _dummy2 { 1; }
  sub dummy3 { 1; }
  sub installed { 1; }
}

package main;

my $methods = CI->methods( CI );
ok( ( ref($methods) eq 'ARRAY'
  and $methods->[0] eq '_class'
  and scalar @$methods == $base_functions),
  "->methods works for non-inheriting class" );
$methods = CI->methods( 'Class::Inspector::Dummy' );
ok( (ref($methods) eq 'ARRAY'
  and $methods->[0] eq '_a_first'
  and scalar @$methods == ($base_functions + 4)
  and scalar( grep { /dummy/ } @$methods ) == 3),
  "->methods works for inheriting class" );
ok( ! CI->methods( BAD ), "->methods fails correctly" );

# Check the variety of different possible ->methods options

# Public option
$methods = CI->methods( CI, 'public' );
ok( (ref($methods) eq 'ARRAY'
  and $methods->[0] eq 'children'
  and scalar @$methods == $base_public),
  "Public ->methods works for non-inheriting class" );
$methods = CI->methods( 'Class::Inspector::Dummy', 'public' );
ok( (ref($methods) eq 'ARRAY'
  and $methods->[0] eq 'adummy1'
  and scalar @$methods == ($base_public + 2)
  and scalar( grep { /dummy/ } @$methods ) == 2),
  "Public ->methods works for inheriting class" );
ok( ! CI->methods( BAD ), "Public ->methods fails correctly" );

# Private option
$methods = CI->methods( CI, 'private' );
ok( (ref($methods) eq 'ARRAY'
  and $methods->[0] eq '_class'
  and scalar @$methods == $base_private),
  "Private ->methods works for non-inheriting class" );
$methods = CI->methods( 'Class::Inspector::Dummy', 'private' );
ok( (ref($methods) eq 'ARRAY'
  and $methods->[0] eq '_a_first'
  and scalar @$methods == ($base_private + 2)
  and scalar( grep { /dummy/ } @$methods ) == 1),
  "Private ->methods works for inheriting class" );
ok( ! CI->methods( BAD ), "Private ->methods fails correctly" );

# Full option
$methods = CI->methods( CI, 'full' );
ok( (ref($methods) eq 'ARRAY'
  and $methods->[0] eq 'Class::Inspector::_class'
  and scalar @$methods == $base_functions),
  "Full ->methods works for non-inheriting class" );
$methods = CI->methods( 'Class::Inspector::Dummy', 'full' );
ok( (ref($methods) eq 'ARRAY'
  and $methods->[0] eq 'Class::Inspector::Dummy::_a_first'
  and scalar @$methods == ($base_functions + 4)
  and scalar( grep { /dummy/ } @$methods ) == 3),
  "Full ->methods works for inheriting class" );
ok( ! CI->methods( BAD ), "Full ->methods fails correctly" );

# Expanded option
$methods = CI->methods( CI, 'expanded' );
ok( (ref($methods) eq 'ARRAY'
  and ref($methods->[0]) eq 'ARRAY'
  and $methods->[0]->[0] eq 'Class::Inspector::_class'
  and $methods->[0]->[1] eq 'Class::Inspector'
  and $methods->[0]->[2] eq '_class'
  and ref($methods->[0]->[3]) eq 'CODE'
  and scalar @$methods == $base_functions),
  "Expanded ->methods works for non-inheriting class" );
$methods = CI->methods( 'Class::Inspector::Dummy', 'expanded' );
ok( (ref($methods) eq 'ARRAY'
  and ref($methods->[0]) eq 'ARRAY'
  and $methods->[0]->[0] eq 'Class::Inspector::Dummy::_a_first'
  and $methods->[0]->[1] eq 'Class::Inspector::Dummy'
  and $methods->[0]->[2] eq '_a_first'
  and ref($methods->[0]->[3]) eq 'CODE'
  and scalar @$methods == ($base_functions + 4)
  and scalar( grep { /dummy/ } map { $_->[2] } @$methods ) == 3),
  "Expanded ->methods works for inheriting class" );
ok( ! CI->methods( BAD ), "Expanded ->methods fails correctly" );

# Check clashing between options
ok( ! CI->methods( CI, 'public', 'private' ), "Public and private ->methods clash correctly" );
ok( ! CI->methods( CI, 'private', 'public' ), "Public and private ->methods clash correctly" );
ok( ! CI->methods( CI, 'full', 'expanded' ), "Full and expanded ->methods class correctly" );
ok( ! CI->methods( CI, 'expanded', 'full' ), "Full and expanded ->methods class correctly" );

# Check combining options
$methods = CI->methods( CI, 'public', 'expanded' );
ok( (ref($methods) eq 'ARRAY'
  and ref($methods->[0]) eq 'ARRAY'
  and $methods->[0]->[0] eq 'Class::Inspector::children'
  and $methods->[0]->[1] eq 'Class::Inspector'
  and $methods->[0]->[2] eq 'children'
  and ref($methods->[0]->[3]) eq 'CODE'
  and scalar @$methods == $base_public),
  "Public + Expanded ->methods works for non-inheriting class" );
$methods = CI->methods( 'Class::Inspector::Dummy', 'public', 'expanded' );
ok( (ref($methods) eq 'ARRAY'
  and ref($methods->[0]) eq 'ARRAY'
  and $methods->[0]->[0] eq 'Class::Inspector::Dummy::adummy1'
  and $methods->[0]->[1] eq 'Class::Inspector::Dummy'
  and $methods->[0]->[2] eq 'adummy1'
  and ref($methods->[0]->[3]) eq 'CODE'
  and scalar @$methods == ($base_public + 2)
  and scalar( grep { /dummy/ } map { $_->[2] } @$methods ) == 2),
  "Public + Expanded ->methods works for inheriting class" );
ok( ! CI->methods( BAD ), "Expanded ->methods fails correctly" );





#####################################################################
# Search Tests

# Create the classes to use
CLASSES: {
  package Foo;

  sub foo { 1 };

  package Foo::Subclass;

  @Foo::Subclass::ISA = 'Foo';

  package Bar;

  @Bar::ISA = 'Foo';

  package This;

  sub isa { $_[1] eq 'Foo' ? 1 : undef }

  1;
}

# Check trivial ->find cases
SCOPE: {
  is( CI->subclasses( '' ), undef, '->subclasses(bad) returns undef'  );
  is( CI->subclasses( BAD ), '',   '->subclasses(none) returns false' );
  my $rv = CI->subclasses( CI );
  is_deeply( $rv, [ 'Class::Inspector::Dummy' ], '->subclasses(CI) returns just itself' );

  # Check non-trivial ->subclasses cases
  $rv = CI->subclasses( 'Foo' );
  is_deeply( $rv, [ 'Bar', 'Foo::Subclass', 'This' ],
    '->subclasses(nontrivial) returns the expected class list' );
}





#####################################################################
# Regression Tests

# Discovered in 1.06, fixed in 1.07
# In some cases, spurious empty GLOB entries can be created in a package.
# These contain no actual symbols, but were causing ->loaded to return true.
# An empty namespace with a single spurious empty glob entry (although
# created in this test with a scalar) should return FALSE for ->loaded
$Class::Inspector::SpuriousPackage::something = 1;
$Class::Inspector::SpuriousPackage::something = 1; # Avoid a warning
ok( ! Class::Inspector->loaded('Class::Inspector::SpuriousPackage'),
  '->loaded returns false for spurious glob in package' );



# Discovered in 1.11, fixed in 1.12
# With the introduction of ->subclasses, we exposed ourselves to
# non-local problems with ->isa method implementations.
PACKAGES: {
  # The busted package
  package Class::Inspector::BrokenISA;
  use vars qw{&isa};
  our $VERSION = '0.01';
  # The test packages
  package My::Foo;
  our $VERSION = '0.01';
  package My::Bar;
  our $VERSION = '0.01';
  our @ISA     = 'My::Foo';
}
TESTS: {
  my $rv = Class::Inspector->subclasses( 'My::Foo' );
  is_deeply( $rv, [ 'My::Bar' ],
    '->subclasses in the presence of an evil ->isa does not crash' );
}
