add meta feature for all compressions, add random unit test

servicepoint2/Cargo.toml

@@ -25,4 +25,5 @@ compression_zlib = ["dep:flate2"]
 compression_bzip2 = ["dep:bzip2"]
 compression_lzma = ["dep:rust-lzma"]
 compression_zstd = ["dep:zstd"]
+all_compressions = ["compression_zlib", "compression_bzip2", "compression_lzma", "compression_zstd"]
 c_api = []

servicepoint2/src/command.rs

@@ -855,4 +855,9 @@ mod tests {
             ))
         );
     }
+
+    #[test]
+    fn origin_add() {
+        assert_eq!(Origin(4, 2), Origin(1, 0) + Origin(3, 2));
+    }
 }