add encode decode for a chunk that compresses

src/frames.zig

@@ -45,7 +45,6 @@ pub fn encode(allocator: Allocator, writer: anytype, data: []u8) !void {
     try writer.writeAll(&IDENTIFIER_FRAME);
     var i: usize = 0;
     while (i < data.len) {
-        std.debug.print("chunk[{d}..{d}]", .{ i, i + UNCOMPRESSED_CHUNK_SIZE });
         const chunk = data[i..@min(i + UNCOMPRESSED_CHUNK_SIZE, data.len)];
         const compressed = try snappy.encode(allocator, chunk);
         defer allocator.free(compressed);
@@ -146,6 +145,7 @@ test "decode" {
 }
 
 test "encode" {
+    // this should lead to an uncompressed chunk
     const data = "thissNaPpY";
     const data_slice = try std.testing.allocator.alloc(u8, data.len);
     defer std.testing.allocator.free(data_slice);
@@ -162,3 +162,26 @@ test "encode" {
 
     try std.testing.expectEqualSlices(std.meta.Child([]const u8), dumped, expected);
 }
+
+test "encode<>decode" {
+    // this should lead to a compressed chunk
+    const data = "thissNaPpYYYYYYYYYYYYYYYYYYYY";
+    const data_slice = try std.testing.allocator.alloc(u8, data.len);
+    defer std.testing.allocator.free(data_slice);
+
+    std.mem.copyForwards(u8, data_slice, data);
+    var arraylistdata = std.ArrayList(u8).init(std.testing.allocator);
+    defer arraylistdata.deinit();
+    const fbswriter = arraylistdata.writer();
+
+    try encode(std.testing.allocator, fbswriter, data_slice);
+    const encoded = arraylistdata.items;
+
+    var arraylistdata1 = std.ArrayList(u8).init(std.testing.allocator);
+    defer arraylistdata1.deinit();
+    const fbswriter1 = arraylistdata1.writer();
+    try decode(std.testing.allocator, fbswriter1, encoded);
+    const decoded = arraylistdata1.items;
+
+    try std.testing.expectEqualSlices(std.meta.Child([]const u8), data, decoded);
+}