add test for check function

jest.config.js

@@ -0,0 +1,8 @@
+export default {
+  preset: 'ts-jest/presets/default-esm',
+  extensionsToTreatAsEsm: ['.ts'],
+  testEnvironment: 'node',
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+  },
+};

package.json

@@ -3,9 +3,14 @@
   "version": "1.0.0",
   "type": "module",
   "scripts": {
-    "start": "tsx src/runner.ts"
+    "start": "tsx src/runner.ts",
+    "test": "jest"
   },
   "devDependencies": {
+    "@jest/globals": "^29.7.0",
+    "@types/jest": "^29.5.8",
+    "jest": "^29.7.0",
+    "ts-jest": "^29.1.1",
     "tsx": "^4.7.0",
     "typescript": "^5.3.0"
   }

src/checks.test.ts

@@ -0,0 +1,84 @@
+import { createClientInitializationCheck } from './checks';
+
+describe('createClientInitializationCheck', () => {
+  it('should return SUCCESS for a valid initialize request', () => {
+    const validRequest = {
+      protocolVersion: '2025-06-18',
+      clientInfo: {
+        name: 'TestClient',
+        version: '1.0.0'
+      }
+    };
+
+    const check = createClientInitializationCheck(validRequest);
+    expect(check.status).toBe('SUCCESS');
+    expect(check.errorMessage).toBeUndefined();
+  });
+
+  it('should return FAILURE when protocol version is missing', () => {
+    const invalidRequest = {
+      clientInfo: {
+        name: 'TestClient',
+        version: '1.0.0'
+      }
+    };
+
+    const check = createClientInitializationCheck(invalidRequest);
+    expect(check.status).toBe('FAILURE');
+    expect(check.errorMessage).toContain('Protocol version not provided');
+  });
+
+  it('should return FAILURE when protocol version does not match', () => {
+    const invalidRequest = {
+      protocolVersion: '2024-11-05',
+      clientInfo: {
+        name: 'TestClient',
+        version: '1.0.0'
+      }
+    };
+
+    const check = createClientInitializationCheck(invalidRequest);
+    expect(check.status).toBe('FAILURE');
+    expect(check.errorMessage).toContain('Version mismatch');
+  });
+
+  it('should return FAILURE when client name is missing', () => {
+    const invalidRequest = {
+      protocolVersion: '2025-06-18',
+      clientInfo: {
+        version: '1.0.0'
+      }
+    };
+
+    const check = createClientInitializationCheck(invalidRequest);
+    expect(check.status).toBe('FAILURE');
+    expect(check.errorMessage).toContain('Client name missing');
+  });
+
+  it('should return FAILURE when client version is missing', () => {
+    const invalidRequest = {
+      protocolVersion: '2025-06-18',
+      clientInfo: {
+        name: 'TestClient'
+      }
+    };
+
+    const check = createClientInitializationCheck(invalidRequest);
+    expect(check.status).toBe('FAILURE');
+    expect(check.errorMessage).toContain('Client version missing');
+  });
+
+  it('should support custom expected spec version', () => {
+    const request = {
+      protocolVersion: '2024-11-05',
+      clientInfo: {
+        name: 'TestClient',
+        version: '1.0.0'
+      }
+    };
+
+    const check = createClientInitializationCheck(request, '2024-11-05');
+    expect(check.status).toBe('SUCCESS');
+    expect(check.errorMessage).toBeUndefined();
+  });
+});