Fix up is binary & sync_lib docs & tests

backend/sync_lib/tests/web.rs

@@ -1,13 +1,46 @@
 //! Test suite for the Web and headless browsers.
 
-#![cfg(target_arch = "wasm32")]
-
-extern crate wasm_bindgen_test;
+use insta::assert_debug_snapshot;
+use sync_lib::*;
 use wasm_bindgen_test::*;
 
-wasm_bindgen_test_configure!(run_in_browser);
-
-#[wasm_bindgen_test]
-fn pass() {
-    assert_eq!(1 + 1, 2);
+#[wasm_bindgen_test(unsupported = test)]
+fn test_bytes_to_base64() {
+    let input = b"hello";
+    let expected = "aGVsbG8";
+    assert_eq!(bytes_to_base64(input), expected);
+}
+
+#[wasm_bindgen_test(unsupported = test)]
+fn test_base64_to_bytes() {
+    let input = "aGVsbG8";
+    let expected = b"hello".to_vec();
+    assert_eq!(base64_to_bytes(input).unwrap(), expected);
+}
+
+#[test] // insta doesn't support wasm-bindgen-test
+fn test_base64_to_bytes_error() {
+    let input = "===";
+    assert_debug_snapshot!(base64_to_bytes(input));
+}
+
+#[wasm_bindgen_test(unsupported = test)]
+fn merge_text() {
+    let left = b"hello ";
+    let right = b"world";
+    assert_eq!(merge(b"", left, right), b"hello world".to_vec());
+}
+
+#[wasm_bindgen_test(unsupported = test)]
+fn merge_binary() {
+    let left = [0, 1, 2];
+    let right = [3, 4, 5];
+    assert_eq!(merge(b"", &left, &right), right);
+}
+
+#[wasm_bindgen_test(unsupported = test)]
+fn test_is_binary() {
+    assert!(is_binary(&[0, 159, 146, 150]));
+    assert!(is_binary(&[0, 12]));
+    assert!(!is_binary(b"hello"));
 }