A new M::BI test.

p4raw-id: //depot/perl@15006

1 files changed, 59 insertions, 0 deletions

diff --git a/lib/Math/BigInt/t/isa.t b/lib/Math/BigInt/t/isa.t
new file mode 100644
index 0000000000..adb80f9331
--- /dev/null
+++ b/lib/Math/BigInt/t/isa.t
@@ -0,0 +1,59 @@
+#!/usr/bin/perl -w
+
+use Test;
+use strict;
+
+BEGIN
+  {
+  $| = 1;
+  # to locate the testing files
+  my $location = $0; $location =~ s/isa.t//i;
+  if ($ENV{PERL_CORE})
+    {
+    # testing with the core distribution
+    @INC = qw(../t/lib);
+    }
+  unshift @INC, qw(../lib);
+  if (-d 't')
+    {
+    chdir 't';
+    require File::Spec;
+    unshift @INC, File::Spec->catdir(File::Spec->updir, $location);
+    }
+  else
+    {
+    unshift @INC, $location;
+    }
+  print "# INC = @INC\n";
+
+  plan tests => 7;
+  }
+
+use Math::BigInt::Subclass;
+use Math::BigFloat::Subclass;
+use Math::BigInt;
+use Math::BigFloat;
+
+use vars qw ($class $try $x $y $f @args $ans $ans1 $ans1_str $setup $CL);
+$class = "Math::BigInt::Subclass";
+$CL = "Math::BigInt::Calc";
+
+# Check that a subclass is still considered a BigInt
+ok ($class->new(123)->isa('Math::BigInt'),1);
+
+# ditto for plain Math::BigInt
+ok (Math::BigInt->new(123)->isa('Math::BigInt'),1);
+
+# But Math::BigFloats aren't
+ok (Math::BigFloat->new(123)->isa('Math::BigInt') || 0,0);
+
+# see what happens if we feed a Math::BigFloat into new()
+$x = Math::BigInt->new(Math::BigFloat->new(123));
+ok (ref($x),'Math::BigInt');
+ok ($x->isa('Math::BigInt'),1);
+
+# ditto for subclass
+$x = Math::BigInt->new(Math::BigFloat->new(123));
+ok (ref($x),'Math::BigInt');
+ok ($x->isa('Math::BigInt'),1);
+