1 files changed, 72 insertions, 0 deletions
diff --git a/dist/Math-BigRat/t/biglog.t b/dist/Math-BigRat/t/biglog.t
new file mode 100644
index 0000000000..42e9ac8d64
--- /dev/null
+++ b/dist/Math-BigRat/t/biglog.t
@@ -0,0 +1,72 @@
+#!/usr/bin/perl -w
+
+# Test blog function (and bpow, since it uses blog), as well as bexp().
+
+use strict;
+use Test::More tests => 17;
+
+use Math::BigRat;
+
+my $cl = "Math::BigRat";
+
+#############################################################################
+# test log($n)
+
+# does not work yet
+#is ($cl->new(2)->blog(), '0', "blog(2)");
+#is ($cl->new(288)->blog(), '5',"blog(288)");
+#is ($cl->new(2000)->blog(), '7', "blog(2000)");
+
+#############################################################################
+# test exp($n)
+
+is ($cl->new(1)->bexp()->as_int(), '2', "bexp(1)");
+is ($cl->new(2)->bexp()->as_int(), '7',"bexp(2)");
+is ($cl->new(3)->bexp()->as_int(), '20', "bexp(3)");
+
+# rounding not implemented yet
+#is ($cl->new(3)->bexp(10), '20', "bexp(3,10)");
+
+# $x < 0 => NaN
+ok ($cl->new(-2)->blog(), 'NaN');
+ok ($cl->new(-1)->blog(), 'NaN');
+ok ($cl->new(-10)->blog(), 'NaN');
+ok ($cl->new(-2,2)->blog(), 'NaN');
+
+#############################################################################
+# test bexp() with cached results
+
+is ($cl->new(1)->bexp(),
+  '90933395208605785401971970164779391644753259799242' . '/' .
+  '33452526613163807108170062053440751665152000000000',
+  'bexp(1)');
+is ($cl->new(2)->bexp(1,40), $cl->new(1)->bexp(1,45)->bpow(2,40), 'bexp(2)');
+
+is ($cl->new("12.5")->bexp(1,61), $cl->new(1)->bexp(1,65)->bpow(12.5,61), 'bexp(12.5)');
+
+#############################################################################
+# test bexp() with big values (non-cached)
+
+is ($cl->new(1)->bexp(1,100)->as_float(100),
+  '2.718281828459045235360287471352662497757247093699959574966967627724076630353547594571382178525166427',
+ 'bexp(100)');
+
+is ($cl->new("12.5")->bexp(1,91), $cl->new(1)->bexp(1,95)->bpow(12.5,91),
+  'bexp(12.5) to 91 digits');
+
+#############################################################################
+# some integer results
+is ($cl->new(2)->bpow(32)->blog(2),  '32', "2 ** 32");
+is ($cl->new(3)->bpow(32)->blog(3),  '32', "3 ** 32");
+is ($cl->new(2)->bpow(65)->blog(2),  '65', "2 ** 65");
+
+my $x = Math::BigInt->new( '777' ) ** 256;
+my $base = Math::BigInt->new( '12345678901234' );
+is ($x->copy()->blog($base), 56, 'blog(777**256, 12345678901234)');
+
+$x = Math::BigInt->new( '777' ) ** 777;
+$base = Math::BigInt->new( '777' );
+is ($x->copy()->blog($base), 777, 'blog(777**777, 777)');
+
+# all done
+1;