Add Header tests

tests/header.rs

@@ -0,0 +1,25 @@
+use bqsp::{BoxPack, Data, Header};
+
+#[test]
+fn byte_repr() {
+    let box_pack = BoxPack::new(
+        Data::from([0x00_u8; 16].as_slice()),
+        1u16,
+        1,
+    );
+
+    let header_array: [u8; Header::SIZE] = box_pack.header.into_array();
+    let header_array_expected: [u8; Header::SIZE] = [16, 0, 0, 0, 1, 0, 1];
+    assert_eq!(
+        header_array,
+        header_array_expected,
+        "Header encoding mismatch!",
+    );
+
+    let header_decoded = Header::from_array(header_array_expected);
+    assert_eq!(
+        box_pack.header,
+        header_decoded,
+        "Header decoding mismatch!",
+    );
+}