dedevillela / Simple-Featured-Image-Column

tests/test-sample.php

<?php
/**
 * Class SampleTest
 *
 * @package Sample_Plugin
 */

/**
 * Sample test case.
 */
class SampleTest extends WP_UnitTestCase {

The type WP_UnitTestCase was not found. Maybe you did not declare it correctly or list all dependencies?

	/**
	 * A single example test.
	 */
	function test_sample() {

It is generally recommended to explicitly declare the visibility for methods.

		// Replace this with some actual testing code.
		$this->assertTrue( true );
	}
}