Added round-trip testing

cz/tests/round_trip.rs

@@ -0,0 +1,51 @@
+use std::io::Cursor;
+
+use cz::{common::CzVersion, DynamicCz};
+
+const KODIM03: (u16, u16, &[u8]) = (128, 128, include_bytes!("test_images/kodim03.rgba"));
+const KODIM23: (u16, u16, &[u8]) = (225, 225, include_bytes!("test_images/kodim23.rgba"));
+const SQPTEXT: (u16, u16, &[u8]) = (2048, 810, include_bytes!("test_images/sqp_text.rgba"));
+const DPFLOGO: (u16, u16, &[u8]) = (1123, 639, include_bytes!("test_images/dpf_logo.rgba"));
+
+type TestImage = (u16, u16, &'static [u8]);
+const TEST_IMAGES: &[TestImage] = &[KODIM03, KODIM23, SQPTEXT, DPFLOGO];
+
+#[test]
+fn cz0_round_trip() {
+    for image in TEST_IMAGES {
+        let original_cz = DynamicCz::from_raw(
+            CzVersion::CZ0,
+            image.0,
+            image.1,
+            image.2.to_vec()
+        );
+
+        let mut cz_bytes = Vec::new();
+        original_cz.encode(&mut cz_bytes).unwrap();
+
+        let mut cz_bytes = Cursor::new(cz_bytes);
+        let decoded_cz = DynamicCz::decode(&mut cz_bytes).unwrap();
+
+        assert_eq!(original_cz.as_raw(), decoded_cz.as_raw());
+    }
+}
+
+#[test]
+fn cz1_round_trip() {
+    for image in TEST_IMAGES {
+        let original_cz = DynamicCz::from_raw(
+            CzVersion::CZ1,
+            image.0,
+            image.1,
+            image.2.to_vec()
+        );
+
+        let mut cz_bytes = Vec::new();
+        original_cz.encode(&mut cz_bytes).unwrap();
+
+        let mut cz_bytes = Cursor::new(cz_bytes);
+        let decoded_cz = DynamicCz::decode(&mut cz_bytes).unwrap();
+
+        assert_eq!(original_cz.as_raw(), decoded_cz.as_raw());
+    }
+}