adds test for reverb

Author: dvdsk

tests/reverb.rs

@@ -0,0 +1,27 @@
+mod test_support;
+use std::time::Duration;
+
+use rodio::Source;
+use test_support::{TestSource, TestSpan};
+
+#[test]
+fn without_buffered() {
+    let source = TestSource::new()
+        .with_span(TestSpan::silence().with_exact_duration(Duration::from_secs(5)));
+
+    let reverb = source.clone().reverb(Duration::from_secs_f32(0.05), 0.3);
+    let n_samples = reverb.count();
+
+    assert_eq!(n_samples, source.len(),);
+}
+
+#[test]
+fn with_buffered() {
+    let source = TestSource::new()
+        .with_span(TestSpan::silence().with_exact_duration(Duration::from_secs(5)));
+
+    let reverb = source.clone().buffered().reverb(Duration::from_secs_f32(0.05), 0.3);
+    let n_samples = reverb.count();
+
+    assert_eq!(n_samples, source.len(),);
+}