Add vitest and unit coverage for provider helpers

package.json

@@ -20,7 +20,7 @@
     "lint:fix": "biome check --write src",
     "format": "biome format src",
     "format:fix": "biome format src --write",
-    "test": "echo \"No tests yet\""
+    "test": "vitest"
   },
   "keywords": [],
   "author": "",
@@ -48,6 +48,7 @@
     "@types/express": "^5.0.5",
     "@types/node": "^24.10.1",
     "tsx": "^4.20.6",
-    "typescript": "^5.9.3"
+    "typescript": "^5.9.3",
+    "vitest": "^2.1.4"
   }
 }

src/index.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it } from "vitest";
+import { normalizeE164, toWhatsappJid, assertProvider } from "./index.js";
+
+describe("normalizeE164", () => {
+	it("strips whatsapp: prefix and whitespace", () => {
+		expect(normalizeE164("whatsapp:+1 555 123 4567")).toBe("+15551234567");
+	});
+
+	it("adds plus when missing", () => {
+		expect(normalizeE164("1555123")).toBe("+1555123");
+	});
+});
+
+describe("toWhatsappJid", () => {
+	it("converts E164 to jid", () => {
+		expect(toWhatsappJid("+1 555 123 4567")).toBe("15551234567@s.whatsapp.net");
+	});
+});
+
+describe("assertProvider", () => {
+	it("accepts valid providers", () => {
+		expect(() => assertProvider("twilio")).not.toThrow();
+		expect(() => assertProvider("web")).not.toThrow();
+	});
+
+	it("throws on invalid provider", () => {
+		expect(() => assertProvider("invalid" as string)).toThrow();
+	});
+});

src/index.ts

@@ -5,6 +5,7 @@ import net from "node:net";
 import os from "node:os";
 import path from "node:path";
 import process, { stdin as input, stdout as output } from "node:process";
+import { fileURLToPath } from "node:url";
 import readline from "node:readline/promises";
 import { promisify } from "node:util";
 import bodyParser from "body-parser";
@@ -384,8 +385,7 @@ type Provider = "twilio" | "web";
 
 function assertProvider(input: string): asserts input is Provider {
 	if (input !== "twilio" && input !== "web") {
-		console.error("Provider must be 'twilio' or 'web'");
+		throw new Error("Provider must be 'twilio' or 'web'");
-		process.exit(1);
 	}
 }
 
@@ -1818,4 +1818,11 @@ program
 		await waitForever();
 	});
 
-program.parseAsync(process.argv);
+export { normalizeE164, toWhatsappJid, assertProvider };
+
+const isMain =
+	process.argv[1] && fileURLToPath(import.meta.url) === process.argv[1];
+
+if (isMain) {
+	program.parseAsync(process.argv);
+}