diff --git a/saphyr/tests/quickcheck.rs b/saphyr/tests/quickcheck.rs
index 43fd254..c2c89bc 100644
--- a/saphyr/tests/quickcheck.rs
+++ b/saphyr/tests/quickcheck.rs
@@ -9,13 +9,14 @@ use yaml_rust::{Yaml, YamlEmitter, YamlLoader};
 quickcheck! {
     fn test_check_weird_keys(xs: Vec<String>) -> TestResult {
         let mut out_str = String::new();
+        let input = Yaml::Array(xs.into_iter().map(Yaml::String).collect());
         {
             let mut emitter = YamlEmitter::new(&mut out_str);
-            emitter.dump(&Yaml::Array(xs.into_iter().map(Yaml::String).collect())).unwrap();
+            emitter.dump(&input).unwrap();
         }
-        if let Err(err) = YamlLoader::load_from_str(&out_str) {
-            return TestResult::error(err.description());
+        match YamlLoader::load_from_str(&out_str) {
+            Ok(output) => TestResult::from_bool(output.len() == 1 && input == output[0]),
+            Err(err) => TestResult::error(err.description()),
         }
-        TestResult::passed()
     }
 }