1 files changed, 39 insertions, 0 deletions
diff --git a/t/env-value.t b/t/env-value.t
new file mode 100644
index 0000000..c1d439e
--- /dev/null
+++ b/t/env-value.t
@@ -0,0 +1,39 @@
+use strict;
+use warnings;
+
+use Test::More 0.88;
+
+{
+    package T;
+
+    use strict;
+    use warnings;
+
+    use lib 't/lib';
+
+    use Module::Implementation;
+    my $loader = Module::Implementation::build_loader_sub(
+        implementations => [ 'Impl1', 'Impl2' ],
+        symbols         => ['return_42'],
+    );
+
+    $ENV{T_IMPLEMENTATION} = 'Impl2';
+
+    $loader->();
+}
+
+{
+    ok( T->can('return_42'), 'T package has a return_42 sub' );
+    ok(
+        !T->can('return_package'),
+        'T package does not have return_package sub - only copied requested symbols'
+    );
+    is( T::return_42(), 42, 'T::return_42 work as expected' );
+    is(
+        Module::Implementation::implementation_for('T'),
+        'Impl2',
+        'T::_implementation returns implementation set in ENV'
+    );
+}
+
+done_testing();