Initial commit: USDT transfer worker (RabbitMQ + Postgres + Vault)

tests/amount.test.ts

@@ -0,0 +1,24 @@
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import { formatUsdtAmount, parseUsdtAmount } from "../src/domain/amount.js";
+
+void describe("USDT amount parsing", () => {
+  void it("parses whole and fractional USDT with 6 decimals", () => {
+    assert.equal(parseUsdtAmount("1"), 1_000_000n);
+    assert.equal(parseUsdtAmount("1.234567"), 1_234_567n);
+    assert.equal(parseUsdtAmount("0.000001"), 1n);
+  });
+
+  void it("rejects zero, negative, malformed, and over-precise values", () => {
+    assert.throws(() => parseUsdtAmount("0"), /greater than zero/);
+    assert.throws(() => parseUsdtAmount("-1"), /valid decimal/);
+    assert.throws(() => parseUsdtAmount("1.0000001"), /at most 6 decimals/);
+    assert.throws(() => parseUsdtAmount("1e3"), /valid decimal/);
+  });
+
+  void it("formats raw token units back to a trimmed USDT string", () => {
+    assert.equal(formatUsdtAmount(1_234_567n), "1.234567");
+    assert.equal(formatUsdtAmount(1_000_000n), "1");
+    assert.equal(formatUsdtAmount(10n), "0.00001");
+  });
+});