Add tests

tests/file_io_test.rs

@@ -0,0 +1,75 @@
+use std::io::Write;
+
+use musicfs::origins::local::file_io::assemble_flac_read;
+
+#[test]
+fn assemble_flac_read_picture_header_region() {
+    let mut f = tempfile::NamedTempFile::new().unwrap();
+    let data: Vec<u8> = (0..100).collect();
+    f.write_all(&data).unwrap();
+    f.flush().unwrap();
+    let path = f.path();
+
+    let header = b"ABCD";
+    let pic_hdr = [0x86, 0x00, 0x00, 0x05];
+    let pic_ranges = [(10u64, 5u64)];
+    let real_audio_start = 50u64;
+
+    let result = assemble_flac_read(
+        path,
+        header,
+        &[pic_hdr],
+        &pic_ranges,
+        real_audio_start,
+        4,
+        4,
+    )
+    .unwrap();
+
+    assert_eq!(result, pic_hdr);
+}
+
+#[test]
+fn assemble_flac_read_picture_data_region() {
+    let mut f = tempfile::NamedTempFile::new().unwrap();
+    let data: Vec<u8> = (0..100).collect();
+    f.write_all(&data).unwrap();
+    f.flush().unwrap();
+    let path = f.path();
+
+    let header = b"ABCD";
+    let pic_hdr = [0x86, 0x00, 0x00, 0x05];
+    let pic_ranges = [(10u64, 5u64)];
+    let real_audio_start = 50u64;
+
+    let result = assemble_flac_read(
+        path,
+        header,
+        &[pic_hdr],
+        &pic_ranges,
+        real_audio_start,
+        8,
+        5,
+    )
+    .unwrap();
+
+    assert_eq!(result, vec![10, 11, 12, 13, 14]);
+}
+
+#[test]
+fn assemble_flac_read_full_virtual_layout() {
+    let mut f = tempfile::NamedTempFile::new().unwrap();
+    let data: Vec<u8> = (0..200).map(|i| i as u8).collect();
+    f.write_all(&data).unwrap();
+    f.flush().unwrap();
+    let path = f.path();
+
+    let header = vec![0xAA; 8];
+    let real_audio_start = 100u64;
+
+    let result = assemble_flac_read(path, &header, &[], &[], real_audio_start, 0, 18).unwrap();
+
+    let mut expected = vec![0xAA; 8];
+    expected.extend_from_slice(&(100..110).map(|i| i as u8).collect::<Vec<u8>>());
+    assert_eq!(result, expected);
+}