diff --git a/tests/codec.rs b/tests/codec.rs
index 6828d6a..4e6383d 100644
--- a/tests/codec.rs
+++ b/tests/codec.rs
@@ -20,8 +20,13 @@ impl From<DecodeError> for TestError {
 }
 
 #[test]
-fn main() -> Result<(), DecodeError> {
-    let file = File::open("qoi_test_images/dice.qoi").unwrap();
+/// There are test images provided by the QOI spec author: https://qoiformat.org/qoi_test_images.zip
+/// This function looks for them in `./qoi_test_images/` and turns them all
+/// into PNGs. Manual inspection is required to evaluate the test result.
+fn decode_qoi_samples() -> Result<(), TestError> {
+    let file = File::open("qoi_test_images/dice.qoi").map_err(|_io_err| TestError::SetupFailure)?;
+
+    // TODO: feed the Result<> forward, don't let a panic path be given to an unaware caller.
     let mut bytes = file.bytes()
         .map(|maybe_bytes|
         {