From 7e0e7ebc85d88aac19a51da7fee926c60e0b8c0f Mon Sep 17 00:00:00 2001
From: Schneems <richard.schneeman+foo@gmail.com>
Date: Mon, 21 Apr 2025 19:46:03 -0500
Subject: [PATCH] Failing test for #899

---
 libcnb/src/layer_env.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/libcnb/src/layer_env.rs b/libcnb/src/layer_env.rs
index f04e26f2..500b6a86 100644
--- a/libcnb/src/layer_env.rs
+++ b/libcnb/src/layer_env.rs
@@ -787,6 +787,20 @@ mod tests {
         assert_eq!(original_delta, disk_delta);
     }
 
+    #[test]
+    fn layer_env_double_path_insert() {
+        let mut layer_env = LayerEnv::new();
+        layer_env.insert(Scope::Build, ModificationBehavior::Delimiter, "PATH", ":");
+        layer_env.insert(Scope::Build, ModificationBehavior::Prepend, "PATH", "two");
+        layer_env.insert(Scope::Build, ModificationBehavior::Prepend, "PATH", "one");
+
+        let result_env = layer_env.apply_to_empty(Scope::Build);
+        assert_eq!(
+            vec![("PATH", "one:two")],
+            environment_as_sorted_vector(&result_env)
+        );
+    }
+
     #[test]
     fn layer_env_insert() {
         let mut layer_env = LayerEnv::new();