Test force rebuild

Author: fornwall

tests/data/script-using-env.rs

@@ -0,0 +1,4 @@
+let msg = option_env!("_RUST_SCRIPT_TEST_MESSAGE").unwrap_or("undefined");
+
+println!("--output--");
+println!("msg = {}", msg);

tests/tests/script.rs

@@ -186,6 +186,34 @@ fn test_whitespace_before_main() {
     .unwrap()
 }
 
+#[test]
+fn test_force_rebuild() {
+    for option in ["-f", "--force"] {
+        std::env::remove_var("_RUST_SCRIPT_TEST_MESSAGE");
+
+        let script_path = "tests/data/script-using-env.rs";
+        let out = rust_script!(option, script_path).unwrap();
+        scan!(out.stdout_output();
+            ("msg = undefined") => ()
+        )
+        .unwrap();
+
+        std::env::set_var("_RUST_SCRIPT_TEST_MESSAGE", "hello");
+
+        let out = rust_script!(script_path).unwrap();
+        scan!(out.stdout_output();
+            ("msg = undefined") => ()
+        )
+        .unwrap();
+
+        let out = rust_script!(option, script_path).unwrap();
+        scan!(out.stdout_output();
+            ("msg = hello") => ()
+        )
+        .unwrap();
+    }
+}
+
 #[test]
 #[ignore]
 fn test_stable_toolchain() {