import perl 5.16.3 from CPAN - worked on by Andrew Fresh and myself

1 files changed, 598 insertions, 0 deletions

diff --git a/gnu/usr.bin/perl/lib/version/t/coretests.pm b/gnu/usr.bin/perl/lib/version/t/coretests.pm
new file mode 100644
index 00000000000..3f785e47263
--- /dev/null
+++ b/gnu/usr.bin/perl/lib/version/t/coretests.pm
@@ -0,0 +1,598 @@
+#! /usr/local/perl -w
+package main;
+require Test::Harness;
+*Verbose = \$Test::Harness::Verbose;
+use Data::Dumper;
+use File::Temp qw/tempfile/;
+use File::Basename;
+
+if ($Test::More::VERSION < 0.48) { # Fix for RT#48268
+    local $^W;
+    *main::use_ok = sub ($;@) {
+	my ($pkg, $req, @args) = @_;
+	eval "use $pkg $req ".join(' ',@args);
+	is ${"$pkg\::VERSION"}, $req, 'Had to manually use version';
+	# If we made it this far, we are ok.
+    };
+}
+
+sub BaseTests {
+
+    my ($CLASS, $method, $qv_declare) = @_;
+    my $warning;
+    local $SIG{__WARN__} = sub { $warning = $_[0] };
+
+    # Insert your test code below, the Test module is use()ed here so read
+    # its man page ( perldoc Test ) for help writing this test script.
+
+    # Test bare number processing
+    diag "tests with bare numbers" unless $ENV{PERL_CORE};
+    $version = $CLASS->$method(5.005_03);
+    is ( "$version" , "5.00503" , '5.005_03 eq 5.00503' );
+    $version = $CLASS->$method(1.23);
+    is ( "$version" , "1.23" , '1.23 eq "1.23"' );
+
+    # Test quoted number processing
+    diag "tests with quoted numbers" unless $ENV{PERL_CORE};
+    $version = $CLASS->$method("5.005_03");
+    is ( "$version" , "5.005_03" , '"5.005_03" eq "5.005_03"' );
+    $version = $CLASS->$method("v1.23");
+    is ( "$version" , "v1.23" , '"v1.23" eq "v1.23"' );
+
+    # Test stringify operator
+    diag "tests with stringify" unless $ENV{PERL_CORE};
+    $version = $CLASS->$method("5.005");
+    is ( "$version" , "5.005" , '5.005 eq "5.005"' );
+    $version = $CLASS->$method("5.006.001");
+    is ( "$version" , "5.006.001" , '5.006.001 eq v5.6.1' );
+    unlike ($warning, qr/v-string without leading 'v' deprecated/, 'No leading v');
+    $version = $CLASS->$method("v1.2.3_4");
+    is ( "$version" , "v1.2.3_4" , 'alpha version 1.2.3_4 eq v1.2.3_4' );
+
+    # test illegal formats
+    diag "test illegal formats" unless $ENV{PERL_CORE};
+    eval {my $version = $CLASS->$method("1.2_3_4")};
+    like($@, qr/multiple underscores/,
+	"Invalid version format (multiple underscores)");
+
+    eval {my $version = $CLASS->$method("1.2_3.4")};
+    like($@, qr/underscores before decimal/,
+	"Invalid version format (underscores before decimal)");
+
+    eval {my $version = $CLASS->$method("1_2")};
+    like($@, qr/alpha without decimal/,
+	"Invalid version format (alpha without decimal)");
+
+    eval { $version = $CLASS->$method("1.2b3")};
+    like($@, qr/non-numeric data/,
+	"Invalid version format (non-numeric data)");
+
+    eval { $version = $CLASS->$method("-1.23")};
+    like($@, qr/negative version number/,
+	"Invalid version format (negative version number)");
+
+    # from here on out capture the warning and test independently
+    {
+    eval{$version = $CLASS->$method("99 and 44/100 pure")};
+
+    like($@, qr/non-numeric data/,
+	"Invalid version format (non-numeric data)");
+
+    eval{$version = $CLASS->$method("something")};
+    like($@, qr/non-numeric data/,
+	"Invalid version format (non-numeric data)");
+
+    # reset the test object to something reasonable
+    $version = $CLASS->$method("1.2.3");
+
+    # Test boolean operator
+    ok ($version, 'boolean');
+
+    # Test class membership
+    isa_ok ( $version, $CLASS );
+
+    # Test comparison operators with self
+    diag "tests with self" unless $ENV{PERL_CORE};
+    is ( $version <=> $version, 0, '$version <=> $version == 0' );
+    ok ( $version == $version, '$version == $version' );
+
+    # Test Numeric Comparison operators
+    # test first with non-object
+    $version = $CLASS->$method("5.006.001");
+    $new_version = "5.8.0";
+    diag "numeric tests with non-objects" unless $ENV{PERL_CORE};
+    ok ( $version == $version, '$version == $version' );
+    ok ( $version < $new_version, '$version < $new_version' );
+    ok ( $new_version > $version, '$new_version > $version' );
+    ok ( $version != $new_version, '$version != $new_version' );
+
+    # now test with existing object
+    $new_version = $CLASS->$method($new_version);
+    diag "numeric tests with objects" unless $ENV{PERL_CORE};
+    ok ( $version < $new_version, '$version < $new_version' );
+    ok ( $new_version > $version, '$new_version > $version' );
+    ok ( $version != $new_version, '$version != $new_version' );
+
+    # now test with actual numbers
+    diag "numeric tests with numbers" unless $ENV{PERL_CORE};
+    ok ( $version->numify() == 5.006001, '$version->numify() == 5.006001' );
+    ok ( $version->numify() <= 5.006001, '$version->numify() <= 5.006001' );
+    ok ( $version->numify() < 5.008, '$version->numify() < 5.008' );
+    #ok ( $version->numify() > v5.005_02, '$version->numify() > 5.005_02' );
+
+    # test with long decimals
+    diag "Tests with extended decimal versions" unless $ENV{PERL_CORE};
+    $version = $CLASS->$method(1.002003);
+    ok ( $version == "1.2.3", '$version == "1.2.3"');
+    ok ( $version->numify == 1.002003, '$version->numify == 1.002003');
+    $version = $CLASS->$method("2002.09.30.1");
+    ok ( $version == "2002.9.30.1",'$version == 2002.9.30.1');
+    ok ( $version->numify == 2002.009030001,
+	'$version->numify == 2002.009030001');
+
+    # now test with alpha version form with string
+    $version = $CLASS->$method("1.2.3");
+    $new_version = "1.2.3_4";
+    diag "numeric tests with alpha-style non-objects" unless $ENV{PERL_CORE};
+    ok ( $version < $new_version, '$version < $new_version' );
+    ok ( $new_version > $version, '$new_version > $version' );
+    ok ( $version != $new_version, '$version != $new_version' );
+
+    $version = $CLASS->$method("1.2.4");
+    diag "numeric tests with alpha-style non-objects"
+	unless $ENV{PERL_CORE};
+    ok ( $version > $new_version, '$version > $new_version' );
+    ok ( $new_version < $version, '$new_version < $version' );
+    ok ( $version != $new_version, '$version != $new_version' );
+
+    # now test with alpha version form with object
+    $version = $CLASS->$method("1.2.3");
+    $new_version = $CLASS->$method("1.2.3_4");
+    diag "tests with alpha-style objects" unless $ENV{PERL_CORE};
+    ok ( $version < $new_version, '$version < $new_version' );
+    ok ( $new_version > $version, '$new_version > $version' );
+    ok ( $version != $new_version, '$version != $new_version' );
+    ok ( !$version->is_alpha, '!$version->is_alpha');
+    ok ( $new_version->is_alpha, '$new_version->is_alpha');
+
+    $version = $CLASS->$method("1.2.4");
+    diag "tests with alpha-style objects" unless $ENV{PERL_CORE};
+    ok ( $version > $new_version, '$version > $new_version' );
+    ok ( $new_version < $version, '$new_version < $version' );
+    ok ( $version != $new_version, '$version != $new_version' );
+
+    $version = $CLASS->$method("1.2.3.4");
+    $new_version = $CLASS->$method("1.2.3_4");
+    diag "tests with alpha-style objects with same subversion"
+	unless $ENV{PERL_CORE};
+    ok ( $version > $new_version, '$version > $new_version' );
+    ok ( $new_version < $version, '$new_version < $version' );
+    ok ( $version != $new_version, '$version != $new_version' );
+
+    diag "test implicit [in]equality" unless $ENV{PERL_CORE};
+    $version = $CLASS->$method("v1.2.3");
+    $new_version = $CLASS->$method("1.2.3.0");
+    ok ( $version == $new_version, '$version == $new_version' );
+    $new_version = $CLASS->$method("1.2.3_0");
+    ok ( $version == $new_version, '$version == $new_version' );
+    $new_version = $CLASS->$method("1.2.3.1");
+    ok ( $version < $new_version, '$version < $new_version' );
+    $new_version = $CLASS->$method("1.2.3_1");
+    ok ( $version < $new_version, '$version < $new_version' );
+    $new_version = $CLASS->$method("1.1.999");
+    ok ( $version > $new_version, '$version > $new_version' );
+
+    diag "test with version class names" unless $ENV{PERL_CORE};
+    $version = $CLASS->$method("v1.2.3");
+    eval { () = $version < 'version' };
+    like $@, qr/^Invalid version format/, "error with $version < 'version'";
+
+    # that which is not expressly permitted is forbidden
+    diag "forbidden operations" unless $ENV{PERL_CORE};
+    ok ( !eval { ++$version }, "noop ++" );
+    ok ( !eval { --$version }, "noop --" );
+    ok ( !eval { $version/1 }, "noop /" );
+    ok ( !eval { $version*3 }, "noop *" );
+    ok ( !eval { abs($version) }, "noop abs" );
+
+SKIP: {
+    skip "version require'd instead of use'd, cannot test $qv_declare", 3
+	unless defined $qv_declare;
+    # test the $qv_declare() sub
+    diag "testing $qv_declare" unless $ENV{PERL_CORE};
+    $version = $CLASS->$qv_declare("1.2");
+    is ( "$version", "v1.2", $qv_declare.'("1.2") == "1.2.0"' );
+    $version = $CLASS->$qv_declare(1.2);
+    is ( "$version", "v1.2", $qv_declare.'(1.2) == "1.2.0"' );
+    isa_ok( $CLASS->$qv_declare('5.008'), $CLASS );
+}
+
+    # test creation from existing version object
+    diag "create new from existing version" unless $ENV{PERL_CORE};
+    ok (eval {$new_version = $CLASS->$method($version)},
+	    "new from existing object");
+    ok ($new_version == $version, "class->$method($version) identical");
+    $new_version = $version->$method(0);
+    isa_ok ($new_version, $CLASS );
+    is ($new_version, "0", "version->$method() doesn't clone");
+    $new_version = $version->$method("1.2.3");
+    is ($new_version, "1.2.3" , '$version->$method("1.2.3") works too');
+
+    # test the CVS revision mode
+    diag "testing CVS Revision" unless $ENV{PERL_CORE};
+    $version = new $CLASS qw$Revision: 1.2$;
+    ok ( $version == "1.2.0", 'qw$Revision: 1.2$ == 1.2.0' );
+    $version = new $CLASS qw$Revision: 1.2.3.4$;
+    ok ( $version == "1.2.3.4", 'qw$Revision: 1.2.3.4$ == 1.2.3.4' );
+
+    # test the CPAN style reduced significant digit form
+    diag "testing CPAN-style versions" unless $ENV{PERL_CORE};
+    $version = $CLASS->$method("1.23_01");
+    is ( "$version" , "1.23_01", "CPAN-style alpha version" );
+    ok ( $version > 1.23, "1.23_01 > 1.23");
+    ok ( $version < 1.24, "1.23_01 < 1.24");
+
+    # test reformed UNIVERSAL::VERSION
+    diag "Replacement UNIVERSAL::VERSION tests" unless $ENV{PERL_CORE};
+
+    my $error_regex = $] < 5.006
+	? 'version \d required'
+	: 'does not define \$t.{7}::VERSION';
+
+    {
+	my ($fh, $filename) = tempfile('tXXXXXXX', SUFFIX => '.pm', UNLINK => 1);
+	(my $package = basename($filename)) =~ s/\.pm$//;
+	print $fh "package $package;\n\$$package\::VERSION=0.58;\n1;\n";
+	close $fh;
+
+	$version = 0.58;
+	eval "use lib '.'; use $package $version";
+	unlike($@, qr/$package version $version/,
+		'Replacement eval works with exact version');
+
+	# test as class method
+	$new_version = $package->VERSION;
+	cmp_ok($new_version,'==',$version, "Called as class method");
+
+	eval "print Completely::Unknown::Module->VERSION";
+	if ( $] < 5.008 ) {
+	    unlike($@, qr/$error_regex/,
+		"Don't freak if the module doesn't even exist");
+	}
+	else {
+	    unlike($@, qr/defines neither package nor VERSION/,
+		"Don't freak if the module doesn't even exist");
+	}
+
+	# this should fail even with old UNIVERSAL::VERSION
+	$version += 0.01;
+	eval "use lib '.'; use $package $version";
+	like($@, qr/$package version $version/,
+		'Replacement eval works with incremented version');
+
+	$version =~ s/0+$//; #convert to string and remove trailing 0's
+	chop($version);	# shorten by 1 digit, should still succeed
+	eval "use lib '.'; use $package $version";
+	unlike($@, qr/$package version $version/,
+		'Replacement eval works with single digit');
+
+	# this would fail with old UNIVERSAL::VERSION
+	$version += 0.1;
+	eval "use lib '.'; use $package $version";
+	like($@, qr/$package version $version/,
+		'Replacement eval works with incremented digit');
+	unlink $filename;
+    }
+
+    { # dummy up some variously broken modules for testing
+	my ($fh, $filename) = tempfile('tXXXXXXX', SUFFIX => '.pm', UNLINK => 1);
+	(my $package = basename($filename)) =~ s/\.pm$//;
+	print $fh "1;\n";
+	close $fh;
+
+	eval "use lib '.'; use $package 3;";
+	if ( $] < 5.008 ) {
+	    like($@, qr/$error_regex/,
+		'Replacement handles modules without package or VERSION');
+	}
+	else {
+	    like($@, qr/defines neither package nor VERSION/,
+		'Replacement handles modules without package or VERSION');
+	}
+	eval "use lib '.'; use $package; \$version = $package->VERSION";
+	unlike ($@, qr/$error_regex/,
+	    'Replacement handles modules without package or VERSION');
+	ok (!defined($version), "Called as class method");
+	unlink $filename;
+    }
+
+    { # dummy up some variously broken modules for testing
+	my ($fh, $filename) = tempfile('tXXXXXXX', SUFFIX => '.pm', UNLINK => 1);
+	(my $package = basename($filename)) =~ s/\.pm$//;
+	print $fh "package $package;\n#look ma no VERSION\n1;\n";
+	close $fh;
+	eval "use lib '.'; use $package 3;";
+	like ($@, qr/$error_regex/,
+	    'Replacement handles modules without VERSION');
+	eval "use lib '.'; use $package; print $package->VERSION";
+	unlike ($@, qr/$error_regex/,
+	    'Replacement handles modules without VERSION');
+	unlink $filename;
+    }
+
+    { # dummy up some variously broken modules for testing
+	my ($fh, $filename) = tempfile('tXXXXXXX', SUFFIX => '.pm', UNLINK => 1);
+	(my $package = basename($filename)) =~ s/\.pm$//;
+	print $fh "package $package;\n\@VERSION = ();\n1;\n";
+	close $fh;
+	eval "use lib '.'; use $package 3;";
+	like ($@, qr/$error_regex/,
+	    'Replacement handles modules without VERSION');
+	eval "use lib '.'; use $package; print $package->VERSION";
+	unlike ($@, qr/$error_regex/,
+	    'Replacement handles modules without VERSION');
+	unlink $filename;
+    }
+SKIP:    { # https://rt.perl.org/rt3/Ticket/Display.html?id=95544
+	skip "version require'd instead of use'd, cannot test UNIVERSAL::VERSION", 2
+	    unless defined $qv_declare;
+	my ($fh, $filename) = tempfile('tXXXXXXX', SUFFIX => '.pm', UNLINK => 1);
+	(my $package = basename($filename)) =~ s/\.pm$//;
+	print $fh "package $package;\n\$VERSION = '3alpha';\n1;\n";
+	close $fh;
+	eval "use lib '.'; use $package; print $package->VERSION";
+	like ($@, qr/Invalid version format \(non-numeric data\)/,
+	    'Warn about bad \$VERSION');
+	eval "use lib '.'; use $package 1;";
+	like ($@, qr/Invalid version format \(non-numeric data\)/,
+	    'Warn about bad $VERSION');
+    }
+
+SKIP: 	{
+	skip 'Cannot test bare v-strings with Perl < 5.6.0', 4
+		if $] < 5.006_000;
+	diag "Tests with v-strings" unless $ENV{PERL_CORE};
+	$version = $CLASS->$method(1.2.3);
+	ok("$version" eq "v1.2.3", '"$version" eq 1.2.3');
+	$version = $CLASS->$method(1.0.0);
+	$new_version = $CLASS->$method(1);
+	ok($version == $new_version, '$version == $new_version');
+	skip "version require'd instead of use'd, cannot test declare", 1
+	    unless defined $qv_declare;
+	$version = &$qv_declare(1.2.3);
+	ok("$version" eq "v1.2.3", 'v-string initialized $qv_declare()');
+    }
+
+SKIP: 	{
+	skip 'Cannot test bare alpha v-strings with Perl < 5.8.1', 2
+		if $] lt 5.008_001;
+	diag "Tests with bare alpha v-strings" unless $ENV{PERL_CORE};
+	$version = $CLASS->$method(v1.2.3_4);
+	is($version, "v1.2.3_4", '"$version" eq "v1.2.3_4"');
+	$version = $CLASS->$method(eval "v1.2.3_4");
+	is($version, "v1.2.3_4", '"$version" eq "v1.2.3_4" (from eval)');
+    }
+
+    diag "Tests with real-world (malformed) data" unless $ENV{PERL_CORE};
+
+    # trailing zero testing (reported by Andreas Koenig).
+    $version = $CLASS->$method("1");
+    ok($version->numify eq "1.000", "trailing zeros preserved");
+    $version = $CLASS->$method("1.0");
+    ok($version->numify eq "1.000", "trailing zeros preserved");
+    $version = $CLASS->$method("1.0.0");
+    ok($version->numify eq "1.000000", "trailing zeros preserved");
+    $version = $CLASS->$method("1.0.0.0");
+    ok($version->numify eq "1.000000000", "trailing zeros preserved");
+
+    # leading zero testing (reported by Andreas Koenig).
+    $version = $CLASS->$method(".7");
+    ok($version->numify eq "0.700", "leading zero inferred");
+
+    # leading space testing (reported by Andreas Koenig).
+    $version = $CLASS->$method(" 1.7");
+    ok($version->numify eq "1.700", "leading space ignored");
+
+    # RT 19517 - deal with undef and 'undef' initialization
+    ok("$version" ne 'undef', "Undef version comparison #1");
+    ok("$version" ne undef, "Undef version comparison #2");
+    $version = $CLASS->$method('undef');
+    unlike($warning, qr/^Version string 'undef' contains invalid data/,
+	"Version string 'undef'");
+
+    $version = $CLASS->$method(undef);
+    like($warning, qr/^Use of uninitialized value/,
+	"Version string 'undef'");
+    ok($version == 'undef', "Undef version comparison #3");
+    ok($version ==  undef,  "Undef version comparison #4");
+    eval "\$version = \$CLASS->$method()"; # no parameter at all
+    unlike($@, qr/^Bizarre copy of CODE/, "No initializer at all");
+    ok($version == 'undef', "Undef version comparison #5");
+    ok($version ==  undef,  "Undef version comparison #6");
+
+    $version = $CLASS->$method(0.000001);
+    unlike($warning, qr/^Version string '1e-06' contains invalid data/,
+	"Very small version objects");
+    }
+
+SKIP: {
+	my $warning;
+	local $SIG{__WARN__} = sub { $warning = $_[0] };
+	# dummy up a legal module for testing RT#19017
+	my ($fh, $filename) = tempfile('tXXXXXXX', SUFFIX => '.pm', UNLINK => 1);
+	(my $package = basename($filename)) =~ s/\.pm$//;
+	print $fh <<"EOF";
+package $package;
+use $CLASS; \$VERSION = ${CLASS}->new('0.0.4');
+1;
+EOF
+	close $fh;
+
+	eval "use lib '.'; use $package 0.000008;";
+	like ($@, qr/^$package version 0.000008 required/,
+	    "Make sure very small versions don't freak");
+	eval "use lib '.'; use $package 1;";
+	like ($@, qr/^$package version 1 required/,
+	    "Comparing vs. version with no decimal");
+	eval "use lib '.'; use $package 1.;";
+	like ($@, qr/^$package version 1 required/,
+	    "Comparing vs. version with decimal only");
+	if ( $] < 5.006_000 ) {
+	    skip 'Cannot "use" extended versions with Perl < 5.6.0', 3;
+	}
+	eval "use lib '.'; use $package v0.0.8;";
+	my $regex = "^$package version v0.0.8 required";
+	like ($@, qr/$regex/, "Make sure very small versions don't freak");
+
+	$regex =~ s/8/4/; # set for second test
+	eval "use lib '.'; use $package v0.0.4;";
+	unlike($@, qr/$regex/, 'Succeed - required == VERSION');
+	cmp_ok ( $package->VERSION, 'eq', '0.0.4', 'No undef warnings' );
+	unlink $filename;
+    }
+
+SKIP: {
+    skip 'Cannot test "use base qw(version)"  when require is used', 3
+	unless defined $qv_declare;
+    my ($fh, $filename) = tempfile('tXXXXXXX', SUFFIX => '.pm', UNLINK => 1);
+    (my $package = basename($filename)) =~ s/\.pm$//;
+    print $fh <<"EOF";
+package $package;
+use base qw(version);
+1;
+EOF
+    close $fh;
+    # need to eliminate any other $qv_declare()'s
+    undef *{"main\::$qv_declare"};
+    ok(!defined(&{"main\::$qv_declare"}), "make sure we cleared $qv_declare() properly");
+    eval "use lib '.'; use $package qw/declare qv/;";
+    ok(defined(&{"main\::$qv_declare"}), "make sure we exported $qv_declare() properly");
+    isa_ok( &$qv_declare(1.2), $package);
+    unlink $filename;
+}
+
+SKIP: {
+	if ( $] < 5.006_000 ) {
+	    skip 'Cannot "use" extended versions with Perl < 5.6.0', 3;
+	}
+	my ($fh, $filename) = tempfile('tXXXXXXX', SUFFIX => '.pm', UNLINK => 1);
+	(my $package = basename($filename)) =~ s/\.pm$//;
+	print $fh <<"EOF";
+package $package;
+\$VERSION = 1.0;
+1;
+EOF
+	close $fh;
+	eval "use lib '.'; use $package 1.001;";
+	like ($@, qr/^$package version 1.001 required/,
+	    "User typed numeric so we error with numeric");
+	eval "use lib '.'; use $package v1.1.0;";
+	like ($@, qr/^$package version v1.1.0 required/,
+	    "User typed extended so we error with extended");
+	unlink $filename;
+    }
+
+    eval 'my $v = $CLASS->$method("1._1");';
+    unlike($@, qr/^Invalid version format \(alpha with zero width\)/,
+	"Invalid version format 1._1");
+
+    {
+	my $warning;
+	local $SIG{__WARN__} = sub { $warning = $_[0] };
+	eval 'my $v = $CLASS->$method(~0);';
+	unlike($@, qr/Integer overflow in version/, "Too large version");
+	like($warning, qr/Integer overflow in version/, "Too large version");
+    }
+
+    {
+	# http://rt.cpan.org/Public/Bug/Display.html?id=30004
+	my $v1 = $CLASS->$method("v0.1_1");
+	(my $alpha1 = Dumper($v1)) =~ s/.+'alpha' => ([^,]+),.+/$1/ms;
+	my $v2 = $CLASS->$method($v1);
+	(my $alpha2 = Dumper($v2)) =~ s/.+'alpha' => ([^,]+),.+/$1/ms;
+	is $alpha2, $alpha1, "Don't fall for Data::Dumper's tricks";
+    }
+
+    {
+	# http://rt.perl.org/rt3/Ticket/Display.html?id=56606
+	my $badv = bless { version => [1,2,3] }, "version";
+	is $badv, '1.002003', "Deal with badly serialized versions from YAML";
+	my $badv2 = bless { qv => 1, version => [1,2,3] }, "version";
+	is $badv2, 'v1.2.3', "Deal with badly serialized versions from YAML ";
+    }
+
+    {
+	# https://rt.cpan.org/Public/Bug/Display.html?id=70950
+	# test indirect usage of version objects
+	my $sum = 0;
+	eval '$sum += $CLASS->$method("v2.0.0")';
+	like $@, qr/operation not supported with version object/,
+	    'No math operations with version objects';
+	# test direct usage of version objects
+	my $v = $CLASS->$method("v2.0.0");
+	eval '$v += 1';
+	like $@, qr/operation not supported with version object/,
+	    'No math operations with version objects';
+    }
+
+    {
+	# https://rt.cpan.org/Ticket/Display.html?id=72365
+	# https://rt.perl.org/rt3/Ticket/Display.html?id=102586
+	eval 'my $v = $CLASS->$method("version")';
+	like $@, qr/Invalid version format/,
+	    'The string "version" is not a version';
+	eval 'my $v = $CLASS->$method("ver510n")';
+	like $@, qr/Invalid version format/,
+	    'All strings starting with "v" are not versions';
+    }
+
+SKIP: {
+	if ( $] < 5.006_000 ) {
+	    skip 'No v-string support at all < 5.6.0', 2;
+	}
+	# https://rt.cpan.org/Ticket/Display.html?id=49348
+	my $v = $CLASS->$method("420");
+	is "$v", "420", 'Correctly guesses this is not a v-string';
+	$v = $CLASS->$method(4.2.0);
+	is "$v", 'v4.2.0', 'Correctly guess that this is a v-string';
+    }
+SKIP: {
+	if ( $] < 5.006_000 ) {
+	    skip 'No v-string support at all < 5.6.0', 4;
+	}
+	# https://rt.cpan.org/Ticket/Display.html?id=50347
+	# Check that the qv() implementation does not change
+
+	ok $CLASS->$method(1.2.3) < $CLASS->$method(1.2.3.1), 'Compare 3 and 4 digit v-strings' ;
+	ok $CLASS->$method(v1.2.3) < $CLASS->$method(v1.2.3.1), 'Compare 3 and 4 digit v-strings, leaving v';
+	ok $CLASS->$method("1.2.3") < $CLASS->$method("1.2.3.1"), 'Compare 3 and 4 digit v-strings, quoted';
+	ok $CLASS->$method("v1.2.3") < $CLASS->$method("v1.2.3.1"), 'Compare 3 and 4 digit v-strings, quoted leading v';
+    }
+
+    {
+	eval '$CLASS->$method("version")';
+	pass("no crash with ${CLASS}->${method}('version')");
+	{
+	    package _102586;
+	    sub TIESCALAR { bless [] }
+	    sub FETCH { "version" }
+	    sub STORE { }
+	    my $v;
+	    tie $v, __PACKAGE__;
+	    $v = $CLASS->$method(1);
+	    eval '$CLASS->$method($v)';
+	}
+	pass('no crash with version->new($tied) where $tied returns "version"');
+    }
+
+    { # [perl #112478]
+	$_112478::VERSION = 9e99;
+	ok eval { _112478->VERSION(9e99); 1 }, '->VERSION(9e99) succeeds'
+	    or diag $@;
+	$_112478::VERSION = 1;
+	eval { _112478->VERSION(9e99) };
+	unlike $@, qr/panic/, '->VERSION(9e99) does not panic';
+    }
+}
+
+1;