Write Unit Tests for `grab` Function

## NOTE:

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## Issue Type

- [ ] Bug Report
- [ ] Feature Request
- [x] Enhancement
- [ ] Other (Please specify)

## Description
The `grab` function currently lacks unit tests. This issue focuses on adding tests to ensure functionality across different environments (browser and Node.js) and edge cases.

## Details (Tasks)

- [ ] **Initialization and Configuration**
- [ ] Test default parameters
- [ ] Test custom headers
- [ ] Validate query parameter handling

- [ ] **Response Handling**
- [ ] Test successful responses (2xx)
- [ ] Test error responses (4xx and 5xx)

- [ ] **Environment-Specific Functionality**
- [ ] Verify `grabBrowser` functionality in a browser environment
- [ ] Verify `grabNode` functionality in a Node.js environment

- [ ] **Timeout Handling**
- [ ] Test timeout behavior in a browser
- [ ] Test timeout behavior in Node.js
- [ ] Ensure proper error reporting on timeout

- [ ] **Edge Cases**
- [ ] Test with malformed URLs
- [ ] Test with missing request body
- [ ] Test unsupported HTTP methods

- [ ] **Integration Tests (Optional)**
- [ ] Use a mock server to validate HTTP interactions

## Reproduction Steps (For Bug Reports)

1. [Step 1]
2. [Step 2]
3. [Step 3]

## Expected Behavior (For Bug Reports)

All tests should validate the behavior of the `grab` function and ensure reliability in both environments.

## Actual Behavior (For Bug Reports)

[Describe what actually happened.]

## Additional Information

[Include any additional information that may help in resolving the issue, such as screenshots, logs, or any related links.]

## Would you like to contribute to fixing this issue?

- [ ] Yes
- [ ] No

## Related Pull Requests (if any)

[Link to any related pull requests, if applicable.]

## Failure Logs

Please include any relevant log snippets or files here.

**Note:** Please make sure to follow the project's code of conduct and contribution guidelines when creating an issue. Thank you for contributing to our open-source project!

Start by locating the grab, grabBrowser, and grabNode entry points and the repository's existing test setup. Add coverage for configuration, responses, timeouts, malformed URLs, missing bodies, and unsupported methods in browser and Node.js environments; done means these behaviors are validated, with mock-server integration tests if appropriate.

Written by the indexing model from the issue text.