diff --git a/tests/integration.rs b/tests/integration.rs
index e8145af..a2d6c1f 100644
--- a/tests/integration.rs
+++ b/tests/integration.rs
@@ -175,8 +175,16 @@ impl TestCase {
         }
 
         println!("run adapter with cargo run");
+
+        println!("self.envs start");
+        for (name, value) in self.envs.iter() {
+            println!("  {name}={value:?}");
+        }
+        println!("self.envs end");
+
         let adapter = Command::new("cargo")
             .args(["run", "-q"])
+            .env_clear()
             .envs(self.envs.iter())
             .stdin(File::open(&req_filename)?)
             .output()?;
@@ -333,7 +341,10 @@ impl TestCaseBuilder {
 
         // Set up the requested environment with RAD_HOME and
         // RAD_PASSPHRASE set to the right values.
-        let mut envs = HashMap::new();
+        let mut envs: HashMap<String, String> = std::env::vars()
+            .filter(|(k, _)| k != "RADICLE_NATIVE_CI" && !k.starts_with("RAD_"))
+            .collect();
+        assert!(!envs.contains_key("RADICLE_NATIVE_CI"));
         envs.insert("RAD_HOME".into(), format!("{}", rad.home().display()));
         envs.insert("RAD_PASSPHRASE".into(), Rad::PASSPHRASE.into());