Add tests and FileProperties methods

src/components/mod.rs

@@ -3,7 +3,7 @@ pub(crate) mod tags;
 
 use std::time::Duration;
 
-/// Various audio properties
+/// Various *immutable* audio properties
 ///
 /// NOTE: All fields are invalidated after any type of conversion
 pub struct FileProperties {
@@ -23,3 +23,40 @@ impl Default for FileProperties {
 		}
 	}
 }
+
+impl FileProperties {
+	/// Create a new FileProperties
+	pub const fn new(
+		duration: Duration,
+		bitrate: Option<u32>,
+		sample_rate: Option<u32>,
+		channels: Option<u8>,
+	) -> Self {
+		Self {
+			duration,
+			bitrate,
+			sample_rate,
+			channels,
+		}
+	}
+
+	/// Duration
+	pub fn duration(&self) -> Duration {
+		self.duration
+	}
+
+	/// Bitrate (kbps)
+	pub fn bitrate(&self) -> Option<u32> {
+		self.bitrate
+	}
+
+	/// Sample rate (Hz)
+	pub fn sample_rate(&self) -> Option<u32> {
+		self.sample_rate
+	}
+
+	/// Channel count
+	pub fn channels(&self) -> Option<u8> {
+		self.channels
+	}
+}

tests/properties.rs

@@ -0,0 +1,34 @@
+use lofty::{FileProperties, Tag};
+
+use std::time::Duration;
+
+const OPUS_PROPERTIES: FileProperties =
+	FileProperties::new(Duration::from_millis(1428), Some(120), Some(48000), Some(2));
+
+const VORBIS_PROPERTIES: FileProperties =
+	FileProperties::new(Duration::from_millis(1450), Some(112), Some(48000), Some(2));
+
+const FLAC_PROPERTIES: FileProperties = FileProperties::new(
+	Duration::from_millis(1428),
+	Some(35084),
+	Some(48000),
+	Some(2),
+);
+
+macro_rules! properties_test {
+	($function:ident, $path:expr, $expected:ident) => {
+		#[test]
+		fn $function() {
+			let tag = Tag::new().read_from_path_signature($path).unwrap();
+			let read_properties = tag.properties();
+
+			assert_eq!(read_properties.duration(), $expected.duration());
+			assert_eq!(read_properties.sample_rate(), $expected.sample_rate());
+			assert_eq!(read_properties.channels(), $expected.channels());
+		}
+	};
+}
+
+properties_test!(test_opus, "tests/assets/a.opus", OPUS_PROPERTIES);
+properties_test!(test_vorbis, "tests/assets/a.ogg", VORBIS_PROPERTIES);
+properties_test!(test_flac, "tests/assets/a.flac", FLAC_PROPERTIES);