From 1bc6117045685433ead56f7a7b7f9b58f54772c5 Mon Sep 17 00:00:00 2001
From: Andras Schmelczer <andras@schmelczer.dev>
Date: Fri, 4 Jul 2025 02:23:32 +0100
Subject: [PATCH] Add JS tests

---
 reconcile-js/src/index.test.ts | 70 ++++++++++++++++++++++++++++++++++
 reconcile-js/src/index.ts      | 11 ++++++
 scripts/test.sh                | 12 ++++--
 3 files changed, 89 insertions(+), 4 deletions(-)
 create mode 100644 reconcile-js/src/index.test.ts

diff --git a/reconcile-js/src/index.test.ts b/reconcile-js/src/index.test.ts
new file mode 100644
index 0000000..9fac9d0
--- /dev/null
+++ b/reconcile-js/src/index.test.ts
@@ -0,0 +1,70 @@
+import { init, reconcile, reconcileWithHistory } from "./index";
+import * as fs from "fs";
+
+describe("reconcile", () => {
+    it("tries calling functions without init", () => {
+        expect(() => reconcile("Hello", "Hello world", "Hi world")).toThrow(
+            /call init()/
+        );
+
+        expect(() =>
+            reconcileWithHistory("Hello", "Hello world", "Hi world")
+        ).toThrow(/call init()/);
+    });
+
+    it("call reconcile without cursors", async () => {
+        await initWasm();
+
+        expect(reconcile("Hello", "Hello world", "Hi world").text).toEqual(
+            "Hi world"
+        );
+    });
+
+    it("call reconcile with cursors", async () => {
+        await initWasm();
+
+        const result = reconcile(
+            "Hello",
+            {
+                text: "Hello world",
+                cursors: [
+                    {
+                        id: 3,
+                        position: 2,
+                    },
+                ],
+            },
+            {
+                text: "Hi world",
+                cursors: [
+                    {
+                        id: 4,
+                        position: 0,
+                    },
+                    { id: 5, position: 3 },
+                ],
+            }
+        );
+
+        expect(result.text).toEqual("Hi world");
+        expect(result.cursors).toEqual([
+            { id: 3, position: 0 },
+            { id: 4, position: 0 },
+            { id: 5, position: 3 },
+        ]);
+    });
+
+    it("call reconcileWithHistory", async () => {
+        await initWasm();
+
+        const result = reconcileWithHistory("Hello", "Hello world", "Hi world");
+
+        expect(result.text).toEqual("Hi world");
+        expect(result.history.length).toBeGreaterThan(0);
+    });
+});
+
+async function initWasm() {
+    const wasmBin = fs.readFileSync("../pkg/reconcile_bg.wasm");
+    await init({ module_or_path: wasmBin });
+}
diff --git a/reconcile-js/src/index.ts b/reconcile-js/src/index.ts
index 8419be2..e9c769b 100644
--- a/reconcile-js/src/index.ts
+++ b/reconcile-js/src/index.ts
@@ -49,6 +49,9 @@ export type Tokenizer = "word" | "character";
 
 let isInitialised = false;
 
+const UNINITIALISED_MODULE_ERROR =
+    "Reconcile module has not been initialized. Please call init() before using any other functions.";
+
 /**
  * Initializes the WASM module for text reconciliation.
  * Must be called before using any other functions.
@@ -83,6 +86,10 @@ export function reconcile(
     right: string | TextWithCursors,
     tokenizer: BuiltinTokenizer = "Word"
 ): TextWithCursors {
+    if (!isInitialised) {
+        throw new Error(UNINITIALISED_MODULE_ERROR);
+    }
+
     const leftCursor = toWasmTextWithCursors(left);
     const rightCursor = toWasmTextWithCursors(right);
 
@@ -114,6 +121,10 @@ export function reconcileWithHistory(
     right: string | TextWithCursors,
     tokenizer: BuiltinTokenizer = "Word"
 ): TextWithCursorsAndHistory {
+    if (!isInitialised) {
+        throw new Error(UNINITIALISED_MODULE_ERROR);
+    }
+
     const leftCursor = toWasmTextWithCursors(left);
     const rightCursor = toWasmTextWithCursors(right);
 
diff --git a/scripts/test.sh b/scripts/test.sh
index 236717c..9c556df 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -2,10 +2,14 @@
 
 set -e
 
-wasm-pack build --target web --features wasm
+wasm-pack build --target web --features wasm,wee_alloc
 cargo test --verbose
 cargo test --features serde
-cargo test --features wasm
-wasm-pack test --node --features wasm
+cargo test --features wasm,wee_alloc
+wasm-pack test --node --features wasm,wee_alloc
 
-echo "Success!"
\ No newline at end of file
+cd reconcile-js
+npm run test
+cd -
+
+echo "Success!"