add RLE compression functions

1 files changed, 20 insertions, 2 deletions

diff --git a/tests/serde.rs b/tests/serde.rs
index 295b8d0..3701707 100644
--- a/tests/serde.rs
+++ b/tests/serde.rs
@@ -11,13 +11,14 @@ fn size_of_image_info_header() {
 
 #[test]
 fn compression() {
-    let img = Image::new(50, 5);
+    let mut img = Image::new(50, 5);
+    img.use_compression(CompressionType::RLE);
     let encoded = img.encode().unwrap();
     let mut cursor = Cursor::new(encoded);
     let decoded = Image::decode(&mut cursor).unwrap();
     assert_eq!(
         CompressionType::from_u32(decoded.image_info_header.compression_type),
-        CompressionType::None
+        CompressionType::RLE
     );
 }
 
@@ -42,3 +43,20 @@ fn size_round_nearest() {
     assert_eq!(decoded.image_info_header.width, 50);
     assert_eq!(decoded.image_info_header.height, 5);
 }
+
+#[test]
+fn size_compressed() {
+    let mut img = Image::new(100, 80);
+    img.use_compression(CompressionType::RLE);
+    let encoded = img.encode().unwrap();
+    // 26 - headers
+    // 4 - first and only length
+    // 4 - separator zero
+    // 1 - first and only data point
+    assert_eq!(encoded.len(), 26 + 4 + 4 + 1);
+    let mut cursor = Cursor::new(encoded);
+    let decoded = Image::decode(&mut cursor).unwrap();
+    assert_eq!(decoded.image_info_header.width, 100);
+    assert_eq!(decoded.image_info_header.height, 80);
+    assert!(decoded.data.iter().all(|x| !*x));
+}