add test for check function

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();
+  });
+});