diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 6e8d780..a4a6c5a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,7 +1,7 @@
 # Setting up a devenv
 
 1. Install [nix](https://github.com/DeterminateSystems/nix-installer) (or install the required dependencies yourself, but for e.g. tests, there are a lot)
-2. Install direnv (optional, recommended for ease of use)
+2. Install [direnv](https://direnv.net/) (optional, recommended for ease of use)
 3. Run `direnv allow` / `nix develop --impure`
 
 ### Tests
diff --git a/devenv-test.nix b/devenv-test.nix
index 0afab94..7829174 100644
--- a/devenv-test.nix
+++ b/devenv-test.nix
@@ -22,6 +22,7 @@
     sbt
     go-task
     cargo-make
+    jbang
 
     #handled by `languages` above:
     # python3
@@ -32,5 +33,6 @@
   env = {
     NODE_HOME = "${pkgs.nodejs}";
     # JAVA_HOME = "${pkgs.adoptopenjdk-jre-bin.home}"; - seems to be handled by languages.java
+    JBANG_HOME = "${pkgs.jbang}/bin";
   };
 }
diff --git a/src/polyglot/sdkman.rs b/src/polyglot/sdkman.rs
index 73ec7ab..d8bf8b4 100644
--- a/src/polyglot/sdkman.rs
+++ b/src/polyglot/sdkman.rs
@@ -61,8 +61,8 @@ mod tests {
     #[test]
     fn test_init_env() {
         init_env();
-        println!("JAVA_HOME: {}", env::var("JAVA_HOME").unwrap());
-        println!("JBANG_HOME: {}", env::var("JBANG_HOME").unwrap());
-        println!("PATH: {}", env::var("PATH").unwrap());
+        println!("JAVA_HOME: {}", env::var("JAVA_HOME").expect("env: JAVA_HOME"));
+        println!("JBANG_HOME: {}", env::var("JBANG_HOME").expect("env: JBANG_HOME"));
+        println!("PATH: {}", env::var("PATH").expect("env: PATH"));
     }
 }