Add basic unit test

This just ensures that the output is as expected. It does not exercise
the extent of the Tangibl scanning beyond one token.

Cargo.toml

@@ -15,8 +15,6 @@ default = ["console_error_panic_hook"]
 
 [dependencies]
 js-sys = "0.3.60"
-serde = { version = "1.0.144", features = ["derive"] }
-serde-wasm-bindgen = "0.4.3"
 topcodes = { version = "0.1.0" }
 wasm-bindgen = "0.2.63"
 

src/lib.rs

@@ -1,7 +1,6 @@
 mod utils;
 
-use serde::{Deserialize, Serialize};
-use topcodes::{Scanner, TopCode};
+use topcodes::Scanner;
 use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen]

tests/assets/to_bytes.py

@@ -0,0 +1,9 @@
+#!/usr/bin/env python3
+
+from PIL import Image
+from io import BytesIO
+
+with Image.open("start.png") as img:
+    buffer = img.tobytes("raw")
+    with open("start.bin", "wb") as binfile:
+        binfile.write(buffer)

tests/web.rs

@@ -3,11 +3,27 @@
 #![cfg(target_arch = "wasm32")]
 
 extern crate wasm_bindgen_test;
+use topcodes_wasm::scan;
+use wasm_bindgen::JsValue;
 use wasm_bindgen_test::*;
 
 wasm_bindgen_test_configure!(run_in_browser);
 
 #[wasm_bindgen_test]
-fn can_scan() {
-    assert_eq!(1 + 1, 2);
+fn can_scan() -> Result<(), Box<dyn std::error::Error>> {
+    let bytes = include_bytes!("./assets/start.bin");
+    let width = 64;
+    let height = 64;
+    // Assert that the bin file has a rgba bytes for the right dimensions.
+    assert_eq!(bytes.len(), width * height * 4);
+    let buffer = js_sys::Uint8ClampedArray::new_with_length(width as u32 * height as u32 * 4);
+    buffer.copy_from(bytes);
+
+    let result = scan(&buffer, width, height).to_vec();
+
+    let expected: Vec<JsValue> = vec![JsValue::from_str(
+        "{\"code\":61,\"unit\":7.6,\"orientation\":-0.07249829200591831,\"x\":31.5,\"y\":30.5}",
+    )];
+    assert_eq!(expected, result);
+    Ok(())
 }