Refactor primitives into namespaces.

src/keys/keys.test.ts

@@ -0,0 +1,37 @@
+import { describe, expect, test } from "vitest";
+
+import { HEX_64_PATTERN } from "../constants";
+import { testPK, testSK } from "../util.test";
+import { generatePrivateKey, getPublicKey } from "./keys";
+
+describe("generatePrivate", () => {
+  test("returns 64 hex characters", () => {
+    const privateKey = generatePrivateKey();
+    expect(privateKey).toMatch(HEX_64_PATTERN);
+  });
+
+  test("generates unique keys", () => {
+    const key1 = generatePrivateKey();
+    const key2 = generatePrivateKey();
+    expect(key1).not.toBe(key2);
+  });
+});
+
+describe("getPublic", () => {
+  test("derives correct public key", () => {
+    const publicKey = getPublicKey(testSK);
+    expect(publicKey).toBe(testPK);
+  });
+
+  test("throws on invalid private key - too short", () => {
+    expect(() => getPublicKey("abc123")).toThrow(/"secret key" expected.*/);
+  });
+
+  test("throws on invalid private key - non-hex", () => {
+    expect(() =>
+      getPublicKey(
+        "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz",
+      ),
+    ).toThrow(/hex string expected,.*/);
+  });
+});