diff --git a/packages/nodes/src/integrations/google-sheets/__tests__/google-sheets.test.ts b/packages/nodes/src/integrations/google-sheets/__tests__/google-sheets.test.ts
new file mode 100644
index 0000000..50e511a
--- /dev/null
+++ b/packages/nodes/src/integrations/google-sheets/__tests__/google-sheets.test.ts
@@ -0,0 +1,181 @@
+import { describe, it, expect } from 'vitest';
+import { GoogleSheetsCredential } from '../googleSheets';
+import { googleSheetsAppendNode } from '../googleSheetsAppend';
+import { googleSheetsClearNode } from '../googleSheetsClear';
+import { googleSheetsReadNode } from '../googleSheetsRead';
+import { googleSheetsUpdateNode } from '../googleSheetsUpdate';
+import {
+  appendInputSchema,
+  appendOutputSchema,
+  clearInputSchema,
+  clearOutputSchema,
+  readInputSchema,
+  readOutputSchema,
+  updateInputSchema,
+  updateOutputSchema,
+} from '../schemas';
+
+// ---------------------------------------------------------------------------
+// Credential definition
+// ---------------------------------------------------------------------------
+
+describe('GoogleSheetsCredential', () => {
+  it('should be defined and have correct name', () => {
+    expect(GoogleSheetsCredential).toBeDefined();
+    expect(GoogleSheetsCredential.name).toBe('googleSheets');
+  });
+
+  it('should have OAuth2 configuration', () => {
+    expect(GoogleSheetsCredential.config.authorizationUrl).toContain('accounts.google.com');
+    expect(GoogleSheetsCredential.config.tokenUrl).toContain('googleapis.com');
+    expect(GoogleSheetsCredential.config.scopes.length).toBeGreaterThan(0);
+  });
+
+  it('should validate a valid credential schema', () => {
+    const result = GoogleSheetsCredential.schema.safeParse({
+      accessToken: 'ya29.mock-token',
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('should reject empty accessToken', () => {
+    const result = GoogleSheetsCredential.schema.safeParse({
+      accessToken: '',
+    });
+    expect(result.success).toBe(false);
+  });
+});
+
+// ---------------------------------------------------------------------------
+// Node metadata
+// ---------------------------------------------------------------------------
+
+describe('Google Sheets node metadata', () => {
+  it('googleSheetsAppendNode has correct type', () => {
+    expect(googleSheetsAppendNode.type).toBe('googleSheetsAppend');
+  });
+
+  it('googleSheetsClearNode has correct type', () => {
+    expect(googleSheetsClearNode.type).toBe('googleSheetsClear');
+  });
+
+  it('googleSheetsReadNode has correct type', () => {
+    expect(googleSheetsReadNode.type).toBe('googleSheetsRead');
+  });
+
+  it('googleSheetsUpdateNode has correct type', () => {
+    expect(googleSheetsUpdateNode.type).toBe('googleSheetsUpdate');
+  });
+});
+
+// ---------------------------------------------------------------------------
+// Schema validation
+// ---------------------------------------------------------------------------
+
+describe('Google Sheets schemas', () => {
+  describe('appendInputSchema', () => {
+    it('should accept valid input', () => {
+      const result = appendInputSchema.safeParse({
+        spreadsheetId: 'abc123',
+        values: [['a', 'b'], ['c', 'd']],
+      });
+      expect(result.success).toBe(true);
+    });
+
+    it('should reject missing spreadsheetId', () => {
+      const result = appendInputSchema.safeParse({
+        values: [['a']],
+      });
+      expect(result.success).toBe(false);
+    });
+  });
+
+  describe('readInputSchema', () => {
+    it('should accept valid input', () => {
+      const result = readInputSchema.safeParse({
+        spreadsheetId: 'abc123',
+      });
+      expect(result.success).toBe(true);
+    });
+  });
+
+  describe('clearInputSchema', () => {
+    it('should accept valid input', () => {
+      const result = clearInputSchema.safeParse({
+        spreadsheetId: 'abc123',
+      });
+      expect(result.success).toBe(true);
+    });
+  });
+
+  describe('updateInputSchema', () => {
+    it('should accept valid input', () => {
+      const result = updateInputSchema.safeParse({
+        spreadsheetId: 'abc123',
+        rowNumber: 1,
+        values: ['a', 'b'],
+      });
+      expect(result.success).toBe(true);
+    });
+
+    it('should reject rowNumber < 1', () => {
+      const result = updateInputSchema.safeParse({
+        spreadsheetId: 'abc123',
+        rowNumber: 0,
+        values: ['a'],
+      });
+      expect(result.success).toBe(false);
+    });
+  });
+});
+
+// ---------------------------------------------------------------------------
+// Executor – credential guard
+// ---------------------------------------------------------------------------
+
+describe('Google Sheets executor credential checks', () => {
+  const mockContext = {
+    userId: 'test',
+    workflowExecutionId: 'test',
+    credentials: {},
+    variables: {},
+    interpolate: (s: string) => s,
+    evaluateJsonPath: (s: string) => s,
+  };
+
+  it('appendNode returns error without credentials', async () => {
+    const result = await googleSheetsAppendNode.executor(
+      { spreadsheetId: 'abc', values: [['x']], range: 'Sheet1!A:Z', valueInputOption: 'USER_ENTERED' },
+      mockContext as any,
+    );
+    expect(result.success).toBe(false);
+    expect(result.error).toBeDefined();
+  });
+
+  it('readNode returns error without credentials', async () => {
+    const result = await googleSheetsReadNode.executor(
+      { spreadsheetId: 'abc', range: 'Sheet1!A:Z' },
+      mockContext as any,
+    );
+    expect(result.success).toBe(false);
+    expect(result.error).toBeDefined();
+  });
+
+  it('clearNode returns error without credentials', async () => {
+    const result = await googleSheetsClearNode.executor(
+      { spreadsheetId: 'abc', range: 'Sheet1!A:Z' },
+      mockContext as any,
+    );
+    expect(result.success).toBe(false);
+    expect(result.error).toBeDefined();
+  });
+
+  it('updateNode returns error without credentials', async () => {
+    const result = await googleSheetsUpdateNode.executor(
+      { spreadsheetId: 'abc', rowNumber: 1, values: ['x'], valueInputOption: 'USER_ENTERED' },
+      mockContext as any,
+    );
+    expect(result.success).toBe(false);
+    expect(result.error).toBeDefined();
+  });
+});
diff --git a/packages/nodes/src/integrations/google-sheets/googleSheets.ts b/packages/nodes/src/integrations/google-sheets/googleSheets.ts
index 488a2a0..1e69c0f 100644
--- a/packages/nodes/src/integrations/google-sheets/googleSheets.ts
+++ b/packages/nodes/src/integrations/google-sheets/googleSheets.ts
@@ -1,4 +1,4 @@
-import { defineOAuth2Credential } from '../types/credentials.js';
+import { defineOAuth2Credential } from '@jam-nodes/core';
 import { z } from 'zod';
 
 export const GoogleSheetsCredential = defineOAuth2Credential({