Adds `nix-shell` test for special-cased ruby interpreter.

The test fakes the interpreter only to verify the arguments it would be
given.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/shell.shebang.rb b/tests/shell.shebang.rb
new file mode 100644
index 000000000000..ea3953ae21ba
--- /dev/null
+++ b/tests/shell.shebang.rb
@@ -0,0 +1,7 @@
+#! @ENV_PROG@ nix-shell
+#! ruby
+#! nix-shell -I nixpkgs=shell.nix --no-substitute
+#! nix-shell --pure -p ruby -i ruby
+
+# Contents doesn't matter.
+abort("This shouldn't be executed.")