silverstripe-environmentcheck/tests/checks/HasFunctionCheckTest.php

<?php

/**
 * @mixin PHPUnit_Framework_TestCase
 */
class HasFunctionCheckTest extends SapphireTest {
	public function testCheckReportsMissingFunctions() {
		$check = new HasFunctionCheck('foo');

		$expected = array(
			EnvironmentCheck::ERROR,
			'foo() doesn\'t exist',
		);

		$this->assertEquals($expected, $check->check());
	}

	public function testCheckReportsFoundFunctions() {
		$check = new HasFunctionCheck('class_exists');

		$expected = array(
			EnvironmentCheck::OK,
			'class_exists() exists',
		);

		$this->assertEquals($expected, $check->check());
	}
}