refactors seektest and adds more formats

tests/seek.rs

@@ -0,0 +1,52 @@
+use std::io::BufReader;
+use std::path::Path;
+use std::time::Duration;
+
+use rodio::source::SeekNotSupported;
+
+// hound wav decoder does not support seeking
+#[cfg(feature = "hound")]
+#[test]
+fn seek_not_supported_returns_err() {
+    let (_stream, handle) = rodio::OutputStream::try_default().unwrap();
+    let sink = rodio::Sink::try_new(&handle).unwrap();
+
+    let file = std::fs::File::open("assets/music.wav").unwrap();
+    sink.append(rodio::Decoder::new(BufReader::new(file)).unwrap());
+    let res = sink.try_seek(Duration::from_secs(5));
+
+    let Err(rodio::source::SeekNotSupported { source }) = res else {
+        panic!("result of try_seek should be error SourceNotSupported")
+    };
+
+    assert!(source.starts_with("rodio::decoder::wav::WavDecoder"));
+}
+
+fn play_and_seek(asset_path: &Path) -> Result<(), SeekNotSupported> {
+    let (_stream, handle) = rodio::OutputStream::try_default().unwrap();
+    let sink = rodio::Sink::try_new(&handle).unwrap();
+
+    let file = std::fs::File::open(asset_path).unwrap();
+    sink.append(rodio::Decoder::new(BufReader::new(file)).unwrap());
+    sink.try_seek(Duration::from_secs(2))
+}
+
+#[test]
+fn seek_returns_err_if_unsupported() {
+    let formats = ["mp3", "wav", "ogg", "flac", "m4a"].into_iter();
+    #[cfg(not(feature = "symphonia"))]
+    let supported = [true, false, false, false, false].into_iter();
+    #[cfg(feature = "symphonia")]
+    let supported = [true, true, true, true, true].into_iter();
+    #[cfg(not(feature = "symphonia"))]
+    let decoder = ["minimp3", "hound", "lewton", "claxon", "_"].into_iter();
+    #[cfg(feature = "symphonia")]
+    let decoder = ["symphonia"].into_iter().cycle();
+
+    for ((format, supported), decoder) in formats.zip(supported).zip(decoder) {
+        println!("trying: {format} by {decoder}, should support seek: {supported}");
+        let asset = Path::new("assets/music").with_extension(format);
+        let res = play_and_seek(&asset);
+        assert_eq!(res.is_ok(), supported);
+    }
+}