feat: setup jest

jest.config.js

@@ -0,0 +1,21 @@
+export default {
+  preset: "ts-jest",
+  testEnvironment: "node",
+  moduleNameMapper: {
+    "^@/(.*)$": "<rootDir>/src/$1",
+  },
+  testMatch: ["**/__tests__/**/*.ts", "**/?(*.)+(spec|test).ts"],
+  collectCoverage: true,
+  coverageDirectory: "coverage",
+  coverageReporters: ["text", "lcov"],
+  extensionsToTreatAsEsm: [".ts"],
+  moduleFileExtensions: ["ts", "js", "json", "node"],
+  transform: {
+    "^.+\\.ts$": [
+      "ts-jest",
+      {
+        useESM: true,
+      },
+    ],
+  },
+};

package.json

@@ -9,6 +9,7 @@
   "type": "module",
   "scripts": {
     "build": "rollup -c",
+    "test": "npx jest",
     "prepublishOnly": "npm run build"
   },
   "keywords": [
@@ -20,7 +21,10 @@
   "author": "Your Name",
   "license": "MIT",
   "dependencies": {
-    "cross-fetch": "^4.0.0"
+    "@types/jest": "^29.5.13",
+    "cross-fetch": "^4.0.0",
+    "jest": "^29.7.0",
+    "ts-jest": "^29.2.5"
   },
   "devDependencies": {
     "@rollup/plugin-alias": "^4.0.2",

src/tests/BitcoinRpcProvider.test.ts

@@ -0,0 +1,58 @@
+import { BitcoinRpcProvider } from "@/BitcoinRpcProvider";
+import fetch from "cross-fetch";
+
+jest.mock("cross-fetch");
+
+describe("BitcoinRpcProvider", () => {
+  let provider: BitcoinRpcProvider;
+
+  beforeEach(() => {
+    provider = new BitcoinRpcProvider({
+      url: "http://localhost:8332",
+      username: "testuser",
+      password: "testpass",
+    });
+  });
+
+  afterEach(() => {
+    jest.resetAllMocks();
+  });
+
+  it("should get block header", async () => {
+    const mockResponse = {
+      json: jest.fn().mockResolvedValue({ result: "mock_block_header" }),
+    };
+    (fetch as jest.MockedFunction<typeof fetch>).mockResolvedValue(
+      mockResponse as any
+    );
+
+    const result = await provider.getBlockHeader("mock_block_hash");
+    expect(result).toBe("mock_block_header");
+    expect(fetch).toHaveBeenCalledWith(
+      "http://localhost:8332",
+      expect.objectContaining({
+        method: "POST",
+        body: expect.stringContaining('"method":"getblockheader"'),
+      })
+    );
+  });
+
+  it("should get block hash", async () => {
+    const mockResponse = {
+      json: jest.fn().mockResolvedValue({ result: "mock_block_hash" }),
+    };
+    (fetch as jest.MockedFunction<typeof fetch>).mockResolvedValue(
+      mockResponse as any
+    );
+
+    const result = await provider.getBlockHash(12345);
+    expect(result).toBe("mock_block_hash");
+    expect(fetch).toHaveBeenCalledWith(
+      "http://localhost:8332",
+      expect.objectContaining({
+        method: "POST",
+        body: expect.stringContaining('"method":"getblockhash"'),
+      })
+    );
+  });
+});