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diff --git a/cpan/Math-BigInt/t/lib_load-mbi-mbf.t b/cpan/Math-BigInt/t/lib_load-mbi-mbf.t
new file mode 100644
index 0000000000..8868667fe3
--- /dev/null
+++ b/cpan/Math-BigInt/t/lib_load-mbi-mbf.t
@@ -0,0 +1,72 @@
+# -*- mode: perl; -*-
+
+use strict;
+use warnings;
+
+use Test::More tests => 10;
+
+use lib "t";
+
+# First load Math::BigInt with Math::BigInt::Calc.
+
+use Math::BigInt lib => "Calc";
+
+is(Math::BigInt -> config("lib"), "Math::BigInt::Calc",
+   'Math::BigInt -> config("lib")');
+
+is(ref Math::BigInt -> bzero() -> {value}, "Math::BigInt::Calc",
+   'ref Math::BigInt -> bzero() -> {value}');
+
+# Math::BigFloat will know that we loaded Math::BigInt::Calc.
+
+require Math::BigFloat;
+
+is(Math::BigFloat -> config("lib"), "Math::BigInt::Calc",
+   'Math::BigFloat -> config("lib")');
+
+is(ref Math::BigFloat -> bzero() -> {_m}, "Math::BigInt::Calc",
+   "ref Math::BigFloat -> bzero() -> {_m}");
+
+# Now load Math::BigInt again with a different lib.
+
+Math::BigInt -> import(lib => "BareCalc");
+
+is(Math::BigInt -> config("lib"), "Math::BigInt::Calc",
+   'Math::BigInt -> config("lib")');
+
+is(ref Math::BigInt -> bzero() -> {value}, "Math::BigInt::Calc",
+   'ref Math::BigInt -> bzero() -> {value}');
+
+# See if Math::BigFloat knows about Math::BigInt::BareCalc.
+
+is(Math::BigFloat -> config("lib"), "Math::BigInt::Calc",
+   "Math::BigFloat is using library Math::BigInt::Calc");
+
+is(ref Math::BigFloat -> bzero() -> {_m}, "Math::BigInt::Calc",
+   "ref Math::BigFloat -> bzero() -> {_m}");
+
+# See that Math::BigFloat supports "only".
+
+eval { Math::BigFloat -> import("only" => "Calc") };
+subtest 'Math::BigFloat -> import("only" => "Calc")' => sub {
+    plan tests => 3;
+
+    is($@, "", '$@ is empty');
+    is(Math::BigFloat -> config("lib"), "Math::BigInt::Calc",
+       'Math::BigFloat -> config("lib")');
+    is(ref Math::BigFloat -> bzero() -> {_m}, "Math::BigInt::Calc",
+       "ref Math::BigFloat -> bzero() -> {_m}");
+};
+
+# See that Math::BigFloat supports "try".
+
+eval { Math::BigFloat -> import("try" => "BareCalc") };
+subtest 'Math::BigFloat -> import("try" => "BareCalc")' => sub {
+    plan tests => 3;
+
+    is($@, "", '$@ is empty');
+    is(Math::BigFloat -> config("lib"), "Math::BigInt::Calc",
+       'Math::BigFloat -> config("lib")');
+    is(ref Math::BigFloat -> bzero() -> {_m}, "Math::BigInt::Calc",
+       "ref Math::BigFloat -> bzero() -> {_m}");
+}