Test bare bash path in shebang on windows (#2144)

tests/lib.rs

@@ -106,6 +106,8 @@ mod timestamps;
 mod undefined_variables;
 mod unexport;
 mod unstable;
+#[cfg(windows)]
+mod windows;
 #[cfg(target_family = "windows")]
 mod windows_shell;
 mod working_directory;

tests/windows.rs

@@ -0,0 +1,15 @@
+use super::*;
+
+#[test]
+fn bare_bash_in_shebang() {
+  Test::new()
+    .justfile(
+      "
+        default:
+            #!bash
+            echo FOO
+      ",
+    )
+    .stdout("FOO\n")
+    .run();
+}